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5/16-18 Counterbore Screws
12-point Flange Screws, Counterbore Screws, Ferry Head Cap Screws or Counterbore Screws, feature a 12 point head and a flanged bearing surface. Usually fully threaded, the 12-point design provides for higher tightening torque, without edge rounding and they are covered under ASME Standard B18.2.1
99 results, (click on any line for more information)
| Search Results Sponsored by Metric Threaded Products, Inc., your source for 12 Point Flange Screws. For more results, visit www.metric-threaded.com | ||||||||
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| Supplier | Loc | Type | Material | Finish | Size | Description | Qty | |
| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Zinc/Black | 5/16-18 x 7/8 | 5/16-18x7/8 blk/zn 12 point flange screws | stock |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 1 1/2 | 12 pt flange screw alloy | 420 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 1 | 12 pt flange screw alloy | 8,440 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 1 1/4 | 12 pt flange screw alloy | 1,500 |
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| Delta | TX | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1/2 | 12 pt countr-bor plain 5/16-18 x 1/2 | 700 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1/2 | coarse 12-point fl/b | 77 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 1/2 | 12 pt flange screw alloy | 500 |
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| ISSCO | MO | 12 Point Flange Screw (CounterBore) | Steel | Cadmium | 5/16-18 x 5/8 | 12 point counterbore screw cad plated | 2469 |
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| MFS | KS | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 5/8 | 12-pt bolt | 49 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 5/8 | 12 pt flange screw alloy | 500 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 5/8 | coarse 12-point fl/b | 274 |
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| Fastener | OH | 12 Point Flange Screw (CounterBore) | Grade B7 | Zinc/Clear | 5/16-18 x 5/8 | cap screw 12pt 5/16-18x5/8 b7 zinc | 9 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 3/4 | 5/16-18 x 3/4 12 point cap screw alloy b18.2.1 | 164 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 3/4 | 5/16-18 x 3/4 12 point cap screw alloy b18.2.1 | 100 |
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| YANKEE | NH | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 3/4 | 5/16-18 x 3/4-12-point flange screw high strength alloy steel | 41 |
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| Valley Nu | WA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 3/4 | nc 12 pt fl/b pl | 3 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 5/16-18 x 3/4 | 5/16-18x3/4 12-pt flange bolt 17-4 ph s/s b18.2.1 () () | 265 |
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| MidStates | MI | 12 Point Flange Screw (CounterBore) | Steel | Chrome | 5/16-18 x 3/4 | 12-pt -chrome | 1 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 3/4 | coarse 12-point fl/b | 2,542 |
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| Alma Bolt | MI | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 3/4 | 12-pt counterbore screw | 1872 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 3/4 | 12 pt flange screw alloy | 9,186 |
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| Delta | TX | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 3/4 | 12 pt countr-bor 5/16-18x3/4 | 798 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 7/8 | 5/16-18 x 7/8 12 point cap screw alloy b18.2.1 | 200 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Zinc/Black | 5/16-18 x 7/8 | 5/16-18x7/8 blk/zn 12 point flange screws | stock |
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| Valley Nu | WA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 7/8 | nc 12 pt fl/b pl | 11 |
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| MidStates | MI | 12 Point Flange Screw (CounterBore) | Steel | Chrome | 5/16-18 x 7/8 | 12-pt -chrome | 15 |
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| Wurth | IN | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 7/8 | 5/16-18 x 7/8 countr-bor scr 12pt alloy | 5,724 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 7/8 | coarse 12-point fl/b | 350 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 7/8 | 12 pt flange screw alloy | 8,500 |
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| Delta | TX | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 7/8 | 12 pt countr-bor 5/16-18x7/8 | 2392 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 | 5/16-18 x 1 12 point cap screw alloy b18.2.1 | 1294 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 | 5/16-18 x 1 12 point cap screw alloy b18.2.1 | 100 |
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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 | 5/16-18 x 1 12 pt flange bolts b18.2.1 | 9 |
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| OBRIEN | OH | 12 Point Flange Screw (CounterBore) | Grade 8 | Plain | 5/16-18 x 1 | 12 pt flange scr gr8 black | 12 |
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| Jackson | MS | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 | nc ferry c/s | 9 |
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| Delta | TX | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 | 12 pt countr-bor plain 5/16-18 x 1 | 193 |
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| ISSCO | MO | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 | 12 point counterbore screw | 518 |
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| Wurth | IN | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 | 5/16-18x1 countr-bor alloy | 1,948 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 | coarse 12-point fl/b | 914 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 1 | 12 pt flange screw alloy | 8,440 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Zinc/Yellow | 5/16-18 x 1 | 12 pt flange screw alloy | 31,988 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Zinc/Black | 5/16-18 x 1 | 12 pt flange screw alloy | 36,690 |
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| Liberty | IL | 12 Point Flange Screw (CounterBore) | Steel | Nickel | 5/16-18 x 1 | 12-pt fl/b (cbore bolt) | 80 |
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| Liberty | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 | 12pt fl/b (cbore bolt) | 5 |
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| THRDFAST | AL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 | 12 pt counterbore screw b18.2.1 | 340 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/4 | 5/16-18 x 1 1/4 12 point cap screw alloy b18.2.1 | 200 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/4 | 5/16-18 x 1 1/4 12 point cap screw alloy b18.2.1 | 50 |
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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/4 | 5/16-18 x 1 1/4 12 pt flange bolts b18.2.1 | 347 |
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| HBBOLT | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/4 | m psi 12 pt fl/b | 100 |
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| Valley Nu | WA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/4 | nc 12 pt fl/b pl | 179 |
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| MidStates | MI | 12 Point Flange Screw (CounterBore) | Steel | Chrome | 5/16-18 x 1 1/4 | 12-pt -chrome | 25 |
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| Delta | TX | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/4 | 12 pt countr-bor plain 5/16-18 x 1 1/4 | 198 |
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| ISSCO | MO | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/4 | 12 point counterbore screw | 263 |
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| Wurth | IN | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/4 | 5/16-18x1 1/4 counter-bor alloy | 1,625 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/4 | coarse 12-point fl/b | 481 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 1 1/4 | 12 pt flange screw alloy | 1,500 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Zinc/Yellow | 5/16-18 x 1 1/4 | 12 pt flange screw alloy | stock |
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| Hayes | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/4 | 5/16-18 x 1 1/4 12 pt. ctrbr screw alloy | 17 |
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| Jackson | MS | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/2 | nc ferry c/s | 7 |
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| CNB | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/2 | 12-pt fl/b material 8640 or 8740 material with .844 unthreaded shank per finish ifi 115 | 16319 |
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| ACCURATE | IL | 12 Point Flange Screw (CounterBore) | Grade 8 | Plain | 5/16-18 x 1 1/2 | 12-pt flange scr gr8 counter-bor | 26 |
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| Valley Nu | WA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/2 | nc 12 pt fl/b pl | 132 |
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| MidStates | MI | 12 Point Flange Screw (CounterBore) | Steel | Chrome | 5/16-18 x 1 1/2 | 12-pt -chrome | 15 |
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| Delta | TX | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/2 | 12 pt countr-bor plain 5/16-18 x 1 1/2 | 50 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 1/2 | coarse 12-point fl/b | 531 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 1 1/2 | 12 pt flange screw alloy | 420 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 3/4 | 5/16-18 x 1 3/4 12 point cap screw alloy b18.2.1 | 25 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 3/4 | 5/16-18 x 1 3/4 12 point cap screw alloy b18.2.1 | 25 |
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| Valley Nu | WA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 3/4 | nc 12 pt fl/b pl | 100 |
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| OBRIEN | OH | 12 Point Flange Screw (CounterBore) | Grade 8 | Plain | 5/16-18 x 1 3/4 | 12 pt flange scr gr8 black | 24 |
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| Delta | TX | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 3/4 | 12 pt countr-bor plain 5/16-18 x 1 3/4 | 180 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 1 3/4 | 12 pt flange screw alloy | 500 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1 3/4 | coarse 12-point fl/b | 100 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 2 | 5/16-18 x 2 12 point cap screw alloy b18.2.1 | 25 |
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| Valley Nu | WA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 2 | nc 12 pt fl/b pl | 14 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 2 | 5/16-18x2 coarse 12-point flange screw alloy pln b18.2.1 | 50 |
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| MidStates | MI | 12 Point Flange Screw (CounterBore) | Steel | Chrome | 5/16-18 x 2 | 12-pt -chrome | 17 |
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| Delta | TX | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 2 | 12 pt countr-bor plain 5/16-18 x 2 | 143 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 2 | 12 pt flange screw alloy | 500 |
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| MidStates | MI | 12 Point Flange Screw (CounterBore) | Steel | Chrome | 5/16-18 x 2 1/4 | 12-pt -chrome | 6 |
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| Wurth | IN | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 2 1/4 | 5/16-18 x 2 1/4 countr-bor alloy | 1,600 |
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| Wurth | IN | 12 Point Flange Screw (CounterBore) | Steel | Electrolytic Zinc Basecoat + Topcoats (Climacoat, Climaseal, etc.) | 5/16-18 x 2 1/4 | 5/16-18 x 2 1/4 counter-bor alloy zinc flake | 467 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 2 1/4 | 12 pt flange screw alloy | 200 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 2 1/4 | coarse 12-point fl/b | 100 |
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| Valley Nu | WA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 2 1/2 | nc 12 pt fl/b pl | 92 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 2 1/2 | coarse 12-point fl/b | 175 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 2 1/2 | 12 pt flange screw alloy | 200 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 5/16-18 x 2 1/2 | 5/16-18x2-1/2 12-pt flange bolt 17-4 ph s/s b18.2.1 | 8 |
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| MFS | KS | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 11/4 | 12-pt bolt | 299 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 2 3/4 | 12 pt flange screw alloy | 200 |
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| Valley Nu | WA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 3 | nc 12 pt fl/b pl | 98 |
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| MTP | CA | 12 Point Flange Screw (CounterBore) | Steel | Black Oxide | 5/16-18 x 3 | 12 pt flange screw alloy | 200 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 3 1/4 | 5/16-18x3 1/4 coarse 12-point flange screw alloy pln b18.2.1 | 5 |
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| Wurth | IN | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 3 1/4 | 5/16-18 x 3-1/4 countr-bor alloy | 503 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 3 1/2 | 5/16-18x3 1/2 coarse 12-point flange screw alloy pln unc | 34 |
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| Hayes | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 3 1/2 | 5/16-18 x 3 1/2 12 pt. ctrbr screw alloy | 26 |
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| Wurth | IN | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 3 3/4 | 5/16-18 x 3-3/4 countr-bor alloy steel | 240 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 4 | 5/16-18x4 coarse 12-point flange screw alloy pln b18.2.1 | 35 |
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| WDMB | IA | 12 Point Flange Screw (CounterBore) | Grade 8 | Plain | 5/16-18 x 6 1/4 | screw 12pt gr8 (pl) 5/16-18x6 1/4 drw (W030) (W030) (W030) | 1,000 |
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| WDMB | IA | 12 Point Flange Screw (CounterBore) | Grade 8 | Plain | 5/16-18 x 7 1/4 | screw 12pt gr8 (pl) 5/16-18x7 1/4 drw (W030) (W030) (W030) | 155 |
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| WDMB | IA | 12 Point Flange Screw (CounterBore) | Grade 8 | Plain | 5/16-18 x 7 3/4 | scr 12pt grade 8 (pl) 5/16-18x7 3/4 (W030) | 456 |
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| WDMB | IA | 12 Point Flange Screw (CounterBore) | Grade 8 | Plain | 5/16-18 x 7 7/8 | scr 12pt grade 8 (pl) 5/16-18x7 7/8 (W030) (W030) | 279 |
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| Endries | WI | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-18 x 1/2 | 5/16-18x1/2 alloy stl 170 000 psi 12 point flange screw plain | 1950 |
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