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5/16 Square Head Bolts
Square Head Bolts were once the most common form of bolt, until they were replaced by hex head bolts. They are covered under ANSI Standard B18.2.1 and are now most commonly used for aesthetic purposes to provide a rustic look .
> 200 matches, . Showing 200, (click on any line for more information)
| Buy Square Head Bolts from one of our FCH Network Members | ||||||||
|---|---|---|---|---|---|---|---|---|
| Supplier | Loc | Type | Material | Finish | Size | Description | Qty | |
| Delta Secondary | IL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 5/8 | 41500 |
| |
| OneMonroe | NC | Square Head Bolt | Steel | Plain | 5/16-18 x 3/4 | 5/16-18 x 3/4 sq hd c/s-pln | 40 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 3/4 | bolt square machine | 50 |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 3/4 | square hd bolt | 66 |
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| WDMB | IA | Square Head Bolt | Steel | Plain | 5/16 x 3/4 | e/key mach sqr st (pl) 5/16x3/4 drw (W030) | 356 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 3/4 | square bolt | 80 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 3/4 | bolt & c/s square boltsquare b18.2.1 | 5500 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 3/4 | 5/16-18x3/4 square machine bolt plain | 20,000 |
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| Liberty | IL | Square Head Bolt | Grade 5 | Zinc/Yellow | 5/16-18 x 3/4 | square m/b | 300 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 3/4 | f/t square hd m/b astm a307 | 1,500 |
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| SWACO | OH | Square Head Bolt | Grade A | Plain | 5/16-18 x 3/4 | 5/16-18x3/4 a307 gr a square hd bolt pl | 600 |
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| Century | FL | Square Head Bolt | Grade 2 | Zinc/Clear | 5/16-18 x 3/4 | 5/16-18 x 3/4 square head bolt grade 2 steel zinc clear | 1776 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Zinc/Clear | 5/16 x 1 | nc square bolt gr. 2 | 82 |
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| American | NY | Square Head Bolt | Grade 5 | Plain | 5/16-24 x 1 | 5/16-24 x 1 square bolt grade 5 | 2220 |
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| American | NY | Square Head Bolt | Grade 5 | Plain | 5/16-24 x 1 | 5/16-24 x 1 square bolt grade 5 plain | 672 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | bolt square machine | 3500 |
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| American | NY | Square Head Bolt | Steel | Zinc/Yellow | 5/16-18 x 1 | square m/s bolt | 170 |
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| ACF | CA | Square Head Bolt | Grade 5 | Zinc/Clear | 5/16-24 x 1 | 5/16-24x1 square head cap screw gr5 z/p rohs | 200 |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 1 | square hd bolt | - |
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| Cal Fastenrs | CA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | square hd mach bolt square hd bolt | 700 |
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| Future Fastener | TX | Square Head Bolt | Grade 2 | Galvanized | 5/16-18 x 1 | 5/16-18 x 1 g2 (sq head mch bolt) galv | 281 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 1 | bolt & c/s square boltsquare b18.2.1 | 5000 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 1 | 5/16-18x1 square machine bolt plain | 20,000 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 | f/t square hd m/b astm a307 | 1,300 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | square m/b | 22,000 |
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| GUIDON | NJ | Square Head Bolt | Steel | Tin Plated | 5/16-18 x 1 | 5/16-18 x 1 square head battery bolt, tin zinc per gmw 3200 | 18,000 |
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| Delta Secondary | IL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 1 | 3190 |
| |
| Brikksen | FL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | 5/16-18 x 1 square head bolt steel zinc .50 waf-rev 3 | inquire |
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| GLF | OH | Square Head Bolt | Grade A | Plain | 5/16-18 x 1 | 5/16-18 x 1 sq hd bolt a307 stl pln | 1100 |
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| Brikksen | FL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | 5/16-18 x 1 square head bolt steel zinc .50 waf-rev 3 | inquire |
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| Brikksen | FL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | 5/16-18 x 1 square head bolt steel zinc .50 waf-rev 3 | inquire |
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| Brikksen | FL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | 5/16-18 x 1 square head bolt steel zinc .50 waf-rev 3 | inquire |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 1 | square bolt | 743 |
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| Hodell | OH | Square Head Bolt | Steel | Galvanized | 5/16-18 x 1 | 5/16-18x1 square hd machine bolt hdg | 426 |
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| Hodell | OH | Square Head Bolt | Steel | Galvanized | 5/16-18 x 1 | 5/16-18x1 square hd machine bolt hdg | 426 |
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| Brikksen | FL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | 5/16-18 x 1 square head bolt steel zinc .50 waf-rev 3 | inquire |
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| Brikksen | FL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | 5/16-18 x 1 square head bolt steel zinc .50 waf-rev 3 | inquire |
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| Brikksen | FL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | 5/16-18 x 1 square head bolt steel zinc .50 waf-rev 3 | inquire |
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| Brikksen | FL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 | 5/16-18 x 1 square head bolt steel zinc .50 waf-rev 3 | inquire |
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| AFI | FL | Square Head Bolt | Steel | Plain | 5/16-18 x 1 | 5/16-18x1 sq hd bolt st () () | 2275 |
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| Longhorn | TX | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 1 | 5/16-18 x 1 sq hd bolt gr 2 plain | 4875 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/4 | bolt square machine | 3900 |
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| Future Fastener | TX | Square Head Bolt | Steel | Galvanized | 5/16-18 x 1 1/4 | 5/16-18x1 1/4 square head mch bolt (hdg) | 800 |
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| IRF | NJ | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/4 | 5/16-18x1 1/4 sq head machine bolt stl zinc rohs 500149a00 | 600 |
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| IRF | NJ | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/4 | 5/16-18x1 1/4 sq head machine bolt stl zinc rohs 500149a00 | 1,400 |
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| NutsBolts | NE | Square Head Bolt | Steel | Plain | 5/16 x 1 1/4 | 5/16 x 1 1/4 sq hd bolt | 39 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 1 1/4 | square bolt | 319 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/4 | 5/16-18x1 1/4 square machine bolt plain | 17.500 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/4 | f/t square hd m/b astm a307 | 1,100 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/4 | square m/b std thrd fsb astm a307 | 1,100 |
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| XL Screw | GA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/4 | f/t square hd m/b astm a307 zp | 1,200 |
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| XL Screw | GA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/4 | square hd m/b std thrd fsb astm a307 zp | 1,200 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/4 | square m/b | 5,000 |
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| Hayes | CA | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 1/4 | 5/16-18 x 1 1/4 square hd bolt 18-8ss | 44 |
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| Century | FL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/4 | 5/16-18 x 1 1/4 square hd. bolt steel zinc plt | 1800 |
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| Mansco | MI | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/4 | 5/16-18x1-1/4 square hd battery terminal bolt w/nut tin 100/box | 50 |
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| XL Screw | GA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 3/8 | f/t square hd m/b astm a307 zp | 1,200 |
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| XL Screw | GA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 3/8 | square hd m/b std thrd fsb astm a307 zp | 1,200 |
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| Palmer Bolt | OH | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 3/8 | square mach bolt | 1,272 |
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| QCS | OR | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 3/8 | 5/16-18x1-3/8 square head cap screw gold plated | 2200 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Zinc/Clear | 5/16 x 1 1/2 | nc square bolt gr. 2 | 7 |
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| American | NY | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/2 | square m/b | 100 |
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| B & K FAST | PA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/2 | 5/16-18 x 1 1/2 square bolts plain b18.2.1 | 1126 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | bolt square machine f/t | 350 |
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| Cal Fastenrs | CA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | square hd mach bolt emer excess | 825 |
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| BHAM | AL | Square Head Bolt | Steel | Galvanized | 5/16-18 x 1 1/2 | 5/16-18 x 1 1/2 sq hd mach bolt hdg | | 6400 |
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| KBS | TN | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/2 | 5/16-18 x 1 1/2 square hd mach.bolt b18.2.1 | 220 |
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| FasSpcMfg | FL | Square Head Bolt | 316, 317, A4 Stainless | Plain | 5/16-18 x 1 1/2 | 5/16-18 x 1-1/2 square head machine bolt 316 stainless | 1 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/2 | 5/16-18x1 1/2 square machine bolt plain | 15,000 |
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| Liberty | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | square bolt | 900 |
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| IPC | VA | Square Head Bolt | Grade A | Zinc/Yellow | 5/16-18 x 1 1/2 | 5/16-18x1 1/2 square hd mach bolt a307 gr a steel zinc yellow | 9,075 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/2 | f/t square hd m/b astm a307 | 1,000 |
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| XL Screw | GA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | f/t square hd m/b astm a307 zp | 1,200 |
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| XL Screw | GA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | square hd m/b std thrd fsb astm a307 zp | 1,200 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | square fulthr m/b | 1,000 |
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| OSSCO | RI | Square Head Bolt | Steel | Plain | 5/16-18 x 1 1/2 | 5/16-18x1 1/2 square hd mach bolt b18.2.1 | 29 |
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| Delta | TX | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | square hd bolt | 1512 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 1 1/2 | square bolt | 481 |
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| Mansco | MI | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 1/2 | 5/16-18x1-1/2 square hd machine bolt triv znc | 200 |
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| Longhorn | TX | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 1 1/2 | 5/16-18 x 1-1/2 sq hd bolt gr 2 pln | 94 |
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| FasSpcMfg | FL | Square Head Bolt | 316, 317, A4 Stainless | Plain | 5/16-18 x 1 1/2 | 5/16-18 x 1-1/2 square head machine bolt 316 stainless | 1 |
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| WDMB | IA | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 9/16 | bolt u sq (18 8) 5/16-18x1 9/16 drw (W040) (W040) | 330 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 16 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 16 | bolt & c/s square boltsquare b18.2.1 | 500 |
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| OneMonroe | MN | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 3/4 | 5/16-18 x 1-3/4 sq hd dog pt-s.s. | 50 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 5/16-18 x 1 3/4 | 5/16-18 x 1-3/4 square head bolt | 160 |
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| OneMonroe | MN | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 1 3/4 | 5/16-18 x 1-3/4 sq hd dog pt-s.s. | 50 |
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| American | NY | Square Head Bolt | Steel | Plain | 5/16-18 x 1 3/4 | square m/b f/t black | 60 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | bolt square machine | 1100 |
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| ISSCO | MO | Square Head Bolt | Grade 5 | Plain | 5/16-24 x 1 3/4 | 450 |
| |
| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 3/4 | f/t square hd m/b astm a307 | 800 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 1 3/4 | square m/b std thrd fsb astm a307 | 800 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | square m/b | 3,000 |
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| Hodell | OH | Square Head Bolt | Steel | Galvanized | 5/16-18 x 1 3/4 | 5/16-18x1 3/4 square hd mach bolt galv | 200 |
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| Hodell | OH | Square Head Bolt | Steel | Galvanized | 5/16-18 x 1 3/4 | 5/16-18x1 3/4 square hd mach bolt galv | 200 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 5/16-18 x 2 | 5/16-18 x 2 square hd bolt | 192 |
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| Endries | WI | Square Head Bolt | Steel | Plain | 5/16-18 x 2 | 5/16-18x2 square head machine bolt full thread plain | 100 |
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| QFS | MI | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 2 | Square head set screw cup point STAINLESS STEEL | 150 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 2 | bolt & c/s square boltsquare b18.2.1 | 5000 |
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| FasSpcMfg | FL | Square Head Bolt | 316, 317, A4 Stainless | Plain | 5/16-18 x 2 | 5/16-18 x 2 square head machine bolt 316 stainless | 2 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 2 | 5/16-18x2 square machine bolt plain | 12.500 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 2 | f/t square hd m/b astm a307 | 700 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 2 | square m/b std thrd fsb astm a307 | 700 |
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| FasSpcMfg | FL | Square Head Bolt | 316, 317, A4 Stainless | Plain | 5/16-18 x 2 | 5/16-18 x 2 square head machine bolt 316 stainless | 2 |
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| WDMB | IA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 2 1/8 | bolt u sq st (zn) 5/16-18x2 1/8 drw | 29 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 2 1/4 | square m/b | 1,600 |
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| THRDFAST | MS | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/4 | square hd bolt b18.2.1 | 80 |
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| American | NY | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | square m/b | 50 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 2 1/2 | bolt square machine | 1550 |
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| ISSCO | MO | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 2 1/2 | 895 |
| |
| Howe Fast | OH | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 2 1/2 | square head set screw half dog point zinc | 250 |
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| Alma Bolt | MI | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 2 1/2 | square bolt | 479 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 2 1/2 | bolt & c/s square boltsquare b18.2.1 | 5000 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | 5/16-18x2 1/2 square machine bolt plain | 12.500 |
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| Liberty | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 2 1/2 | square m/b machine bolt | 2,350 |
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| Liberty | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 2 1/2 | square m/b 18-8 st m/b 18-8 st | 12 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | f/t square hd m/b astm a307 | 600 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | square m/b std thrd fsb astm a307 | 600 |
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| A-Plus Co | OR | Square Head Bolt | Steel | Black Oxide | 5/16-18 x 2 1/2 | 5/16-18 x 2 1/2 sq hd bolt black oxide | 50 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 2 1/2 | square m/b | 1,200 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | nc square bolt pl | 1 |
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| THRDFAST | MS | Square Head Bolt | Steel | Plain | 5/16-18 x 2 1/2 | square hd bolt b18.2.1 | 100 |
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| BIG BOLT | IL | Square Head Bolt | Grade 8 | Zinc/Clear | 5/16-18 x 2 3/4 | bolt & c/s square boltsquare b18.2.1 | 1580 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 2 3/4 | nc square bolt pl | 8 |
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| YANKEE | NH | Square Head Bolt | Steel | Plain | 5/16-18 x 3 | 5/16-18 x 3 square hd bolt | 136 |
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| OneMonroe | NC | Square Head Bolt | Steel | Galvanized | 5/16-18 x 3 | 5/16-18 x 3 galvanized square head bolt | 250 |
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| OneMonroe | NC | Square Head Bolt | Grade A | Zinc/Clear | 5/16-18 x 3 | 5/16-18 x 3 a307a zinc finish square head bolts | 500 |
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| American | NY | Square Head Bolt | Steel | Cadmium | 5/16-18 x 3 | square bolt | 700 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3 | bolt square machine f/t | 4725 |
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| ACCURATE | IL | Square Head Bolt | Steel | < td>Zinc/Clear5/16-18 x 3 | bolt square machine | 1265 |
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| ISSCO | MO | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 3 | 1060 |
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| Jackson | MS | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 3 | square bolt gr. 2 | 179 |
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| Komar | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3 | 5/16-18x3 square hd machine bolt zinc | 2500 |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 3 | bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1 | 500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 3 | bolt & c/s square boltsquare b18.2.1 | 2900 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 3 | 5/16-18x3 square machine bolt plain | 10,000 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 3 | f/t square hd m/b astm a307 | 500 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 3 | square m/b std thrd fsb astm a307 | 500 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3 | square m/b | 300 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3 | square fulthr m/b | 3,000 |
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| OSSCO | RI | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3 | 5/16-18x3 square hd mach bolt plated b18.2.1 | 400 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 3 | nc square bolt pl | 12 |
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| OneMonroe | MA | Square Head Bolt | Steel | Galvanized | 5/16-18 x 3 | 5/16-18 x 3 galvanized square head bolt | 250 |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 3 1/2 | square hd bolt | - |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 3 1/2 | bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1 | 1000 |
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| Liberty | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 3 1/2 | square hd m/b 7/8 tl 7/8 tl | 500 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 3 1/2 | square m/b | 5,000 |
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| SWACO | OH | Square Head Bolt | Grade A | Plain | 5/16-18 x 3 1/2 | 5/16-18x3 1/2 a307 gr a square hd bolt | 320 |
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| ACCURATE | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 4 | bolt square machine | 43 |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 4 | square hd bolt | - |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 4 | bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1 | 1500 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 4 | bolt & c/s square boltsquare b18.2.1 | 34100 |
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| Kanebridge | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 4 | 5/16-18x4 square machine bolt plain | 7.500 |
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| Liberty | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 4 | square m/b f/t m/b f/tead | 450 |
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| Liberty | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 4 | square m/b machine bolt | 205 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 4 | f/t square hd m/b astm a307 | 400 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 4 | square m/b std thrd fsb astm a307 | 400 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 4 | nc square bolt pl | 4 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 4 1/4 | square m/b | 1,200 |
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| Liberty | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 4 1/2 | 5/16-18x4-1/2 square m/b 1 5/6 tl m/b 1 5/6 tl | 180 |
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| MidStates | MI | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 4 1/2 | 5/16-18 x 4 1/2 square hd bolt gr 2 pln | 272 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 4 1/2 | square m/b | 200 |
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| American | NY | Square Head Bolt | Steel | Plain | 5/16-18 x 5 | square bolt | 700 |
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| American | NY | Square Head Bolt | Steel | Plain | 5/16-18 x 5 | square m/s bolt black | 450 |
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| SRF | AL | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 5 | square hd bolt | 17 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 5 | bolt & c/s square boltsquare b18.2.1 | 5000 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 5 | square m/b std thrd fsb astm a307 | 350 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 5 | square m/b | 1,000 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 5 | nc square bolt pl | 12 |
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| American | NY | Square Head Bolt | Steel | Plain | 5/16-18 x 5 1/2 | square m/s bolt black | 500 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 5 1/2 | square m/b | 600 |
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| Hayes | CA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 5 1/2 | 5/16-18 x 5 1/2 square hd bolt zinc | 19 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 5 1/2 | nc square bolt pl | 11 |
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| BIG BOLT | IL | Square Head Bolt | Grade 5 | Plain | 5/16-18 x 6 | bolt & c/s square boltsquare b18.2.1 | 4700 |
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| BIG BOLT | IL | Square Head Bolt | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 5/16-18 x 6 | bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1 | 500 |
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| XL Screw | GA | Square Head Bolt | Steel | Plain | 5/16-18 x 6 | square m/b std thrd fsb astm a307 | 300 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 6 | square m/b | 300 |
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| Hayes | CA | Square Head Bolt | Steel | Plain | 5/16-18 x 6 | 5/16-18 x 6 square hd bolt pln | 34 |
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| Hayes | CA | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 6 | 5/16-18 x 6 square hd bolt zinc | 40 |
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| Valley Nu | WA | Square Head Bolt | Steel | Plain | 5/16-18 x 6 | nc square bolt pl | 9 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 6 1/2 | square m/b | 25 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 7 | bolt square machine | 450 |
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| ACCURATE | IL | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 7 | square m/b | 916 |
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| WDMB | IA | Square Head Bolt | Steel | Plain | 5/16-18 x 7 1/4 | bolt bnt sq st 5/16-18x7.25 (W030) (W030) (#N/A) | 32 |
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| WSB | KY | Square Head Bolt | Steel | Plain | 5/16-18 x 7 1/4 | blt bnt sq st 5/16-18x7.25 b18.2.1 | 32 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 9 1/2 | bolt & c/s square boltsquare b18.2.1 | 3398 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 10 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| Liberty | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 10 | square m/b machine bolt | 173 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 12 | bolt & c/s square boltsquare b18.2.1 | 1000 |
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| BIG BOLT | IL | Square Head Bolt | Steel | Plain | 5/16-18 x 14 | bolt & c/s square boltsquare b18.2.1 | 500 |
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| Century | FL | Square Head Bolt | Steel | Plain | 5/16-18 | ohio nut & bolt 2006-1 5/16-18 4 proj square weld nut steel | 2 |
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| Longhorn | TX | Square Head Bolt | Grade 2 | Galvanized | 5/16-18 x 1 3/4 | 5/16-18 x 1-3/4 sq hd bolt gr 2 gal | 486 |
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| Longhorn | TX | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 2 1/4 | 5/16-18 x 2-1/4 square hd bolt gr 2 | 9 |
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| Longhorn | TX | Square Head Bolt | Grade 2 | Zinc/Clear | 5/16-18 x 4 | 5/16-18 x 4 sq hd bolt gr 2 zinc | 898 |
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| Longhorn | TX | Square Head Bolt | Grade 2 | Plain | 5/16-18 x 3 | 5/16-18 x 3 sq hd bolt gr 2 plain | 440 |
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| Longhorn | TX | Square Head Bolt | Steel | Zinc/Clear | 5/16-18 x 1 3/4 | 5/16-18 x 1-3/4 sq hd bolt zinc | 1300 |
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| Longhorn | TX | Square Head Bolt | Grade 2 | Zinc/Clear | 5/16-18 x 3 | 5/16-18 x 3 sq hd bolt gr 2 zinc | 294 |
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| Longhorn | TX | Square Head Bolt | Grade 2 | Zinc/Clear | 5/16-18 x 5 | 5/16-18 x 5 sq hd bolt gr 2 zinc | 189 |
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| Century | FL | Square Head Bolt | Steel | Plain | 5/16-18 | ohio nut&bolt 2006 5/16-18 square weld nut piloted 4 projections 2006 steel plain | 7750 |
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| Longhorn | TX | Square Head Bolt | Grade 2 | Galvanized | 5/16-18 x 2 1/2 | 5/16-18 x 2-1/2 sq hd bolt gr 2 gal | 304 |
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