FCH News

5/16-18 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 .

186 results, (click on any line for more information)

Buy Square Head Bolts from one of our FCH Network Members
SupplierLocTypeMaterialFinishSizeDescriptionQty 
Future FastenerTXSquare Head BoltGrade 2Galvanized5/16-18 x 15/16-18 x 1 g2 (sq head mch bolt) galv281
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JacksonMSSquare Head BoltGrade 2Plain5/16-18 x 3square bolt gr. 2179
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YANKEENHSquare Head BoltSteelPlain5/16-18 x 35/16-18 x 3 square hd bolt136
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YANKEENHSquare Head BoltSteelPlain5/16-18 x 1 3/45/16-18 x 1-3/4 square head bolt342
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YANKEENHSquare Head BoltSteelPlain5/16-18 x 25/16-18 x 2 square hd bolt192
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ASMCILSquare Head BoltGrade AGalvanized5/16-18 x 3a307 gra square hd m/b low carb hdg b18.2.1150
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ASMCILSquare Head BoltGrade AZinc/Clear5/16-18 x 1 3/45/16-18x1 3/4 a307 gra square hd machine bolt low carb zp1,050
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ASMCILSquare Head BoltGrade APlain5/16-18 x 5(pt) coarse a307 gra square hd m/b low carb150
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ASMCILSquare Head BoltGrade APlain5/16-18 x 6(pt) coarse a307 gra square hd m/b low carb275
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ASMCILSquare Head BoltGrade APlain5/16-18 x 3(pt) coarse a307 gra square hd m/b low carb48
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ASMCILSquare Head BoltGrade AZinc/Clear5/16-18 x 3 1/2a307 gra square hd m/b low carb zp600
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ASMCILSquare Head BoltGrade AGalvanized5/16-18 x 1 1/4a307 gra square hd m/b low carb hdg775
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ASMCILSquare Head BoltSteelZinc/Clear5/16-18 x 3/4coarse square hd m/b low carb zp2,600
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ASMCILSquare Head BoltGrade AGalvanized5/16-18 x 3/4a307 gra square hd m/b low carb hdg b18.2.11,400
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ASMCILSquare Head BoltGrade AZinc/Clear5/16-18 x 1a307 gra square hd m/b low carb zp650
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ASMCILSquare Head BoltGrade APlain5/16-18 x 3 1/2(pt) coarse a307 gra square hd m/b low carb450
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ASMCILSquare Head BoltGrade AGalvanized5/16-18 x 1a307 gra square hd m/b low carb hdg880
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ASMCILSquare Head BoltGrade AZinc/Clear5/16-18 x 1 1/4a307 gra square hd m/b low carb zp565
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ASMCILSquare Head BoltGrade AGalvanized5/16-18 x 2a307 gra square hd m/b low carb hdg750
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ASMCILSquare Head BoltGrade AGalvanized5/16-18 x 1 1/2a307 gra square hd m/b low carb hdg b18.2.1625
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ASMCILSquare Head BoltGrade AGalvanized5/16-18 x 2 1/2a307 gra square hd m/b low carb hdg b18.2.1350
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Cal FastenrsCASquare Head BoltSteelZinc/Clear5/16-18 x 1square hd mach bolt square hd bolt700
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Cal FastenrsCASquare Head BoltSteelZinc/Clear5/16-18 x 1 1/2square hd mach bolt emer excess825
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CenturyFLSquare Head BoltGrade 2Plain5/16-18 x 3/45/16-18 x 3/4 square head bolt grade 2 (STEEL ZINC CLEAR) (STEEL ZINC CLEAR) 1776
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CenturyFLSquare Head BoltSteelPlain5/16-18 x 1 1/45/16-18 x 1 1/4 square hd. bolt (STEEL ZINC PLT) (STEEL ZINC PLT) 1800
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HayesCASquare Head BoltSteelPlain5/16-18 x 65/16-18 x 6 square hd bolt pln34
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HayesCASquare Head BoltSteelZinc/Clear5/16-18 x 5 1/25/16-18 x 5 1/2 square hd bolt zinc19
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HayesCASquare Head BoltSteelZinc/Clear5/16-18 x 65/16-18 x 6 square hd bolt zinc40
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HayesCASquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 1 1/45/16-18 x 1 1/4 square hd bolt 18-8ss44
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BHAMALSquare Head BoltSteelPlain5/16-18 x 1 1/45/16-18x1 1/4 square hd mach bolt b18.2.1858
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 1bolt square machine1000
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ACCURATEILSquare Head BoltSteelPlain5/16-18 x 3/4bolt square machine50
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 1 1/4bolt square machine4000
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 1 1/2bolt square machine f/t350
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 1 3/4bolt square machine100
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 2 1/2bolt square machine1550
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ACCURATEILSquare Head BoltSteelPlain5/16-18 x 4bolt square machine43
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 3bolt square machine f/t5725
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 3bolt square machine1265
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 7bolt square machine450
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LibertyILSquare Head BoltSteelZinc/Clear5/16-18 x 4square m/b f/t m/b f/tead450
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LibertyILSquare Head BoltSteelZinc/Clear5/16-18 x 2 1/2square m/b machine bolt2,350
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LibertyILSquare Head BoltSteelZinc/Clear5/16-18 x 4square m/b machine bolt205
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LibertyILSquare Head BoltGrade 5Zinc/Yellow5/16-18 x 3/4square m/b300
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LibertyILSquare Head BoltSteelZinc/Clear5/16-18 x 1 1/2square bolt900
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LibertyILSquare Head BoltSteelPlain5/16-18 x 3 1/2square hd m/b 7/8 tl 7/8 tl500
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LibertyILSquare Head BoltSteelPlain5/16-18 x 4 1/25/16-18x4-1/2 square m/b 1 5/6 tl m/b 1 5/6 tl180
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LibertyILSquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 2 1/2square m/b 18-8 st m/b 18-8 st26
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LibertyILSquare Head BoltSteelPlain5/16-18 x 10square m/b machine bolt173
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Future FastenerTXSquare Head BoltSteelGalvanized5/16-18 x 1 1/45/16-18x1 1/4 square head mch bolt (hdg)1000
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KomarILSquare Head BoltSteelZinc/Clear5/16-18 x 35/16-18x3 square hd machine bolt zinc2500
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AmericanNYSquare Head BoltSteelPlain5/16-18 x 2 1/2square m/b50
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AmericanNYSquare Head BoltSteelCadmium5/16-18 x 3square bolt700
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AmericanNYSquare Head BoltSteelPlain5/16-18 x 4square bolt2450
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AmericanNYSquare Head BoltSteelPlain5/16-18 x 5square bolt700
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AmericanNYSquare Head BoltSteelPlain5/16-18 x 1 1/2square m/b100
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AmericanNYSquare Head BoltSteelPlain5/16-18 x 1 3/4square m/b f/t black60
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AmericanNYSquare Head BoltSteelPlain5/16-18 x 5square m/s bolt black450
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AmericanNYSquare Head BoltSteelPlain5/16-18 x 5 1/2square m/s bolt black500
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AmericanNYSquare Head BoltSteelZinc/Yellow5/16-18 x 1square m/s bolt170
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Alma BoltMISquare Head BoltGrade 2Plain5/16-18 x 2 1/2square bolt479
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Alma BoltMISquare Head BoltGrade 2Plain5/16-18 x 1 1/4square bolt914
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Alma BoltMISquare Head BoltGrade 2Plain5/16-18 x 3/4square bolt1313
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Alma BoltMISquare Head BoltGrade 2Plain5/16-18 x 1 1/2square bolt757
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Alma BoltMISquare Head BoltGrade 2Plain5/16-18 x 1square bolt1086
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 1 3/4f/t square hd m/b astm a307800
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 1 1/4f/t square hd m/b astm a3071,100
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 3f/t square hd m/b astm a307500
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 1f/t square hd m/b astm a3071,300
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 4f/t square hd m/b astm a307400
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 3/4f/t square hd m/b astm a3071,500
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 2f/t square hd m/b astm a307700
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 1 1/2f/t square hd m/b astm a3071,000
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 2 1/2f/t square hd m/b astm a307600
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 1 1/4square m/b std thrd fsb astm a3071,100
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 1 3/4square m/b std thrd fsb astm a307800
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 2square m/b std thrd fsb astm a307700
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 3square m/b std thrd fsb astm a307500
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 6square m/b std thrd fsb astm a307300
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 4square m/b std thrd fsb astm a307400
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 5square m/b std thrd fsb astm a307350
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XL ScrewGASquare Head BoltSteelPlain5/16-18 x 2 1/2square m/b std thrd fsb astm a307600
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XL ScrewGASquare Head BoltSteelZinc/Clear5/16-18 x 1 1/2f/t square hd m/b astm a307 zp1,200
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XL ScrewGASquare Head BoltSteelZinc/Clear5/16-18 x 1 3/8f/t square hd m/b astm a307 zp1,200
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XL ScrewGASquare Head BoltSteelZinc/Clear5/16-18 x 1 1/4f/t square hd m/b astm a307 zp1,200
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SWACOOHSquare Head BoltGrade APlain5/16-18 x 3/45/16-18x3/4 a307 gr a square hd bolt pl600
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SWACOOHSquare Head BoltGrade APlain5/16-18 x 3 1/25/16-18x3 1/2 a307 gr a square hd bolt320
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IRFNJSquare Head BoltSteelZinc/Clear5/16-18 x 1 1/45/16-18x1 1/4 sq head machine bolt stl zinc rohs 500149a00600
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MidStatesMISquare Head BoltGrade 2Plain5/16-18 x 4 1/25/16-18 x 4 1/2 square hd bolt gr 2 pln272
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WDMBIASquare Head BoltSteelPlain5/16-18 x 7 1/4bolt bnt sq st 5/16-18x7.25 (W030) (W030) (#N/A)32
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KomarILSquare Head BoltSteelZinc/Clear5/16-18 x 35/16-18x3 square hd machine bolt zinc2500
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IPCVASquare Head BoltGrade AZinc/Yellow5/16-18 x 1 1/25/16-18x1 1/2 square hd mach bolt a307 gr a steel zinc yellow9,075
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BIG BOLTILSquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 3 1/2bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.11000
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BIG BOLTILSquare Head BoltSteelPlain5/16-18 x 9 1/2bolt & c/s square boltsquare b18.2.13398
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BIG BOLTILSquare Head BoltGrade 5Plain5/16-18 x 6bolt & c/s square boltsquare b18.2.14700
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BIG BOLTILSquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 4bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.11500
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BIG BOLTILSquare Head BoltGrade 5Plain5/16-18 x 2bolt & c/s square boltsquare b18.2.15000
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BIG BOLTILSquare Head BoltSteelPlain5/16-18 x 14bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 6bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1500
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BIG BOLTILSquare Head BoltGrade 5Plain5/16-18 x 3/4bolt & c/s square boltsquare b18.2.15500
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BIG BOLTILSquare Head BoltGrade 5Plain5/16-18 x 4bolt & c/s square boltsquare b18.2.134100
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BIG BOLTILSquare Head BoltGrade 5Plain5/16-18 x 1bolt & c/s square boltsquare b18.2.15000
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BIG BOLTILSquare Head BoltSteelPlain5/16-18 x 16bolt & c/s square boltsquare b18.2.11000
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BIG BOLTILSquare Head BoltSteelPlain5/16-18 x 12bolt & c/s square boltsquare b18.2.11000
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BIG BOLTILSquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 3bolt & c/s square bolt300 (a1 a2 18-8 304 310 etc.)square b18.2.1500
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BIG BOLTILSquare Head BoltGrade 8Zinc/Clear5/16-18 x 2 3/4bolt & c/s square boltsquare b18.2.11580
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BIG BOLTILSquare Head BoltGrade 5Plain5/16-18 x 3bolt & c/s square boltsquare b18.2.12900
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BIG BOLTILSquare Head BoltSteelPlain5/16-18 x 10bolt & c/s square boltsquare b18.2.11000
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BIG BOLTILSquare Head BoltGrade 5Plain5/16-18 x 2 1/2bolt & c/s square boltsquare b18.2.15000
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BIG BOLTILSquare Head BoltSteelPlain5/16-18 x 16bolt & c/s square boltsquare b18.2.1500
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BIG BOLTILSquare Head BoltGrade 5Plain5/16-18 x 5bolt & c/s square boltsquare b18.2.15000
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JET FITTINGCASquare Head BoltGrade APlain5/16-18 x 3 1/25/16-18x3 1/2 a307 gr a square hd bolt 747061 b18.2.1320
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JET FITTINGCASquare Head BoltGrade APlain5/16-18 x 3/45/16-18x3/4 a307 gr a square hd bolt pl 747046 b18.2.1600
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DeltaTXSquare Head BoltSteelZinc/Clear5/16-18 x 1 1/2square hd bolt1512
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WDMBIASquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 1 9/16bolt u sq (18 8) 5/16-18x1 9/16 drw (W040) (W040)330
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WDMBIASquare Head BoltSteelZinc/Clear5/16-18 x 2 1/8bolt u sq st (zn) 5/16-18x2 1/8 drw29
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QCSORSquare Head BoltSteelZinc/Clear5/16-18 x 1 3/85/16-18x1-3/8 square head cap screw gold plated2200
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AFIFLSquare Head BoltSteelPlain5/16-18 x 15/16-18x1 sq hd bolt st4760
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FasSpcMfgFLSquare Head Bolt316, 317, A4 StainlessPlain5/16-18 x 2square m/b 316 stainless2
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FasSpcMfgFLSquare Head Bolt316, 317, A4 StainlessPlain5/16-18 x 1 1/2square m/b 316 stainless1
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HodellOHSquare Head BoltSteelGalvanized5/16-18 x 1 3/45/16-18x1 3/4 square hd mach bolt galv200
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HodellOHSquare Head BoltSteelGalvanized5/16-18 x 15/16-18x1 square hd machine bolt hdg426
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HodellOHSquare Head BoltSteelGalvanized5/16-18 x 15/16-18x1 square hd machine bolt hdg426
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HodellOHSquare Head BoltSteelGalvanized5/16-18 x 1 3/45/16-18x1 3/4 square hd mach bolt galv200
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ISSCOMOSquare Head BoltGrade 2Plain5/16-18 x 2 1/2895
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ISSCOMOSquare Head BoltGrade 2Plain5/16-18 x 31060
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Palmer BoltOHSquare Head BoltSteelZinc/Clear5/16-18 x 1 3/8square mach bolt1,272
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Delta SecondaryILSquare Head BoltGrade 2Plain5/16-18 x 5/841500
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Delta SecondaryILSquare Head BoltGrade 2Plain5/16-18 x 13190
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B & K FASTPASquare Head BoltSteelPlain5/16-18 x 1 1/25/16-18 x 1 1/2 square bolts plain b18.2.11126
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IRFNJSquare Head BoltSteelZinc/Clear5/16-18 x 1 1/45/16-18x1 1/4 sq head machine bolt stl zinc rohs 500149a001,400
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Kanebridge ILSquare Head BoltSteelPlain5/16-18 x 3/45/16-18x3/4 square machine bolt plain20,000
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Kanebridge ILSquare Head BoltSteelPlain5/16-18 x 15/16-18x1 square machine bolt plain20,000
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Kanebridge ILSquare Head BoltSteelPlain5/16-18 x 1 1/45/16-18x1 1/4 square machine bolt plain17.500
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Kanebridge ILSquare Head BoltSteelPlain5/16-18 x 1 1/25/16-18x1 1/2 square machine bolt plain15,000
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Kanebridge ILSquare Head BoltSteelPlain5/16-18 x 35/16-18x3 square machine bolt plain10,000
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Kanebridge ILSquare Head BoltSteelPlain5/16-18 x 25/16-18x2 square machine bolt plain12.500
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Kanebridge ILSquare Head BoltSteelPlain5/16-18 x 2 1/25/16-18x2 1/2 square machine bolt plain12.500
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Kanebridge ILSquare Head BoltSteelPlain5/16-18 x 45/16-18x4 square machine bolt plain7.500
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OSSCORISquare Head BoltSteelPlain5/16-18 x 1 1/25/16-18x1 1/2 square hd mach bolt b18.2.129
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OSSCORISquare Head BoltSteelZinc/Clear5/16-18 x 35/16-18x3 square hd mach bolt plated b18.2.1400
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ZAL INDUSCASquare Head BoltGrade 2Zinc/Clear5/16-18 x 1 1/25/16-18 x 1 1/2 sq hd mach bolt grade 2 pltd5,000
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ZAL INDUSCASquare Head BoltGrade 2Zinc/Clear5/16-18 x 1 1/45/16-18 x 1 1/4 sq hd mach bolt grade 2 pltd2,050
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ZAL INDUSCASquare Head BoltSteelPlain5/16-18 x 2 1/25/16-18 x 2 1/2 sq hd mach bolt553
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ZAL INDUSCASquare Head BoltGrade 2Zinc/Clear5/16-18 x 3/45/16-18 x 3/4 sq hd mach bolt grade 2 pltd100
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JET FITTINGCASquare Head BoltSteelPlain5/16-18 x 3/4bolt square 5/1618x3/4 s b18.2.1600
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JET FITTINGCASquare Head BoltGrade APlain5/16-18 x 3 1/25/16-18x3-1/2 (pt) square bolt steel a307 plain b18.2.1500
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SRFALSquare Head BoltGrade 2Plain5/16-18 x 1square hd bolt-
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SRFALSquare Head BoltGrade 2Plain5/16-18 x 3 1/2square hd bolt-
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SRFALSquare Head BoltGrade 2Plain5/16-18 x 4square hd bolt-
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SRFALSquare Head BoltGrade 2Plain5/16-18 x 5square hd bolt17
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SRFALSquare Head BoltGrade 2Plain5/16-18 x 3/4square hd bolt66
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JET FITTINGCASquare Head BoltSteelBlack Oxide5/16-18 x 3/4bolt square 5/16-18x3/4 steel black oxide and wax b18.2.12000
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KBSTNSquare Head BoltSteelPlain5/16-18 x 1 1/25/16-18 x 1 1/2 square hd mach.bolt b18.2.1220
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THRDFASTMSSquare Head BoltSteelPlain5/16-18 x 2 1/4square hd bolt b18.2.180
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THRDFASTMSSquare Head BoltSteelPlain5/16-18 x 2 1/2square hd bolt b18.2.1100
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THRDFASTMSSquare Head BoltSteelPlain5/16-18 x 3/4square hd bolt b18.2.180
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WSBKYSquare Head BoltSteelPlain5/16-18 x 7 1/4blt bnt sq st 5/16-18x7.25 b18.2.132
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GUIDONNJSquare Head BoltSteelTin5/16-18 x 15/16-18 x 1 square head battery bolt, tin zinc per gmw 320018,000
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Valley NuWASquare Head BoltSteelPlain5/16-18 x 6nc square bolt pl9
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Valley NuWASquare Head BoltSteelPlain5/16-18 x 2 3/4nc square bolt pl8
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Valley NuWASquare Head BoltSteelPlain5/16-18 x 5nc square bolt pl12
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Valley NuWASquare Head BoltSteelPlain5/16-18 x 3nc square bolt pl12
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Valley NuWASquare Head BoltSteelPlain5/16-18 x 5 1/2nc square bolt pl11
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Valley NuWASquare Head BoltSteelPlain5/16-18 x 4nc square bolt pl4
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Valley NuWASquare Head BoltSteelPlain5/16-18 x 2 1/2nc square bolt pl1
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 6 1/2square m/b25
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 1 3/4square m/b3,000
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 3square m/b300
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 5 1/2square m/b600
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 3 1/2square m/b5,000
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 2 1/4square m/b1,600
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 7square m/b916
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 6square m/b300
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 5square m/b1,000
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 2 1/2square m/b1,200
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 1square m/b22,000
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 3square fulthr m/b3,000
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 4 1/4square m/b1,200
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 1 1/4square m/b5,000
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 1 1/2square fulthr m/b1,000
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ACCURATEILSquare Head BoltSteelZinc/Clear5/16-18 x 4 1/2square m/b200
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QFSMISquare Head Bolt300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16-18 x 2Square head set screw cup point STAINLESS STEEL150
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