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Counterbore Screws, Plain (ASME B18. 2.1)
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
152 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 | |
| Buy Counterbore Screws from one of our FCH Network Members | ||||||||
| 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 () () () | 306 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 3/4-16 x 4 1/2 | 3/4-16x4-1/2 12-pt flange bolt 17-4 ph s/s b18.2.1 () () () | 50 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 1/2-13 x 2 1/2 | 1/2-13x2-1/2 12-pt flange bolt 17-4 ph s/s b18.2.1 () () () | 152 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 7/8-14 x 3 1/4 | 7/8-14x3-1/4 12-pt flange bolt 17-4 ph s/s b18.2.1 () () () | 100 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 3/8-24 x 2 1/2 | 3/8-24x2-1/2 12-pt flange bolt 17-4 ph s/s b18.2.1 () () () | 150 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 3/8-24 x 2 1/4 | 3/8-24x2-1/4 12-pt flange bolt 17-4 ph s/s b18.2.1 () () () | 50 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 3/8-24 x 2 | 3/8-24x2 12-pt flange bolt 17-4 ph s/s b18.2.1 () () () | 49 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 5/8-18 x 8 1/4 | 5/8-18x8-1/4 12-pt flange bolt 17-4 ph s/s b18.2.1 () () () | 1 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 3/8-16 x 2 | 3/8-16x2 12-pt flange bolt 17-4 ph s/s b18.2.1 () () () | 50 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 7/8-9 x 3 3/4 | 7/8-9x3-3/4 12-pt flange bolt 17-4 ph s/s b18.2.1 () () () | 100 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 5/8-18 x 6 3/4 | 5/8-18x6-3/4 12-pt flange bolt 17-4 ph s/s b18.2.1 () () () | 16 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 1-14 x 3 1/2 | 1-14x3-1/2 12-pt flange bolt 17-4 ph s/s b18.2.1 () () () | 2 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Grade 8 | Plain | 1/2-13 x 3 | 1/2-13x3 hex cap-partialthread-grade 8-12 point-plain b18.2.1 () () () | 6 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Grade 8 | Plain | 5/8-11 x 1 3/4 | 5/8-11x1-3/4 12 point flange screw-grade 8-plain b18.2.1 () () () | 15 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | MS9557-12 b18.2.1 () () () | 10 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Grade 8 | Plain | 7/16-20 x 1 1/4 | 7/16-20x1-1/4 12-pt flange bolt grade 8 stl pln b18.2.1 () | 2 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | 9/16-18 x 4 3/4 | 9/16-18x4-3/4 12-pt flange bolt 17-4 ph s/s b18.2.1 () () () | 10 |
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| GLF | OH | 12 Point Flange Screw (CounterBore) | Superalloy (Inconel, Hastelloy, Alloy 20) | Plain | MACHINE SCREW MIL-SPEC MS9554-06 b18.2.1 () () () | 10 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/4-20 x 1 1/4 | 1/4-20 x 1 1/4 12 point cap screw alloy b18.2.1 | 100 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/4-20 x 3/4 | 1/4-20 x 3/4 12 point cap screw alloy b18.2.1 | 75 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/4-28 x 1 1/4 | 1/4-28 x 1 1/4 12 point cap screw alloy b18.2.1 | 125 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/4-28 x 1 1/2 | 1/4-28 x 1 1/2 12 point cap screw alloy b18.2.1 | 65 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/4-28 x 3/4 | 1/4-28 x 3/4 12 point cap screw alloy b18.2.1 | 20 |
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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 | 69 |
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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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| 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 | 75 |
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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 | 62 |
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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 | 125 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-24 x 1 | 5/16-24 x 1 12 point cap screw alloy b18.2.1 | 295 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-24 x 1 1/4 | 5/16-24 x 1 1/4 12 point cap screw alloy b18.2.1 | 120 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-24 x 3/4 | 5/16-24 x 3/4 12 point cap screw alloy b18.2.1 | 150 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-24 x 7/8 | 5/16-24 x 7/8 12 point cap screw alloy b18.2.1 | 25 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-16 x 1 | 3/8-16 x 1 12 point cap screw alloy b18.2.1 | 44 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-16 x 1 1/2 | 3/8-16 x 1 1/2 12 point cap screw alloy b18.2.1 | 111 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-24 x 1 | 3/8-24 x 1 12 point cap screw alloy b18.2.1 | 60 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-24 x 1 1/2 | 3/8-24 x 1 1/2 12 point cap screw alloy b18.2.1 | 72 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-24 x 1 3/4 | 3/8-24 x 1 3/4 12 point cap screw alloy b18.2.1 | 39 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-24 x 2 | 3/8-24 x 2 12 point cap screw alloy b18.2.1 | 100 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/4-16 x 1 1/2 | 3/4-16x1 1/2 fine 12-point flange screw alloy pln b18.2.1 | 15 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/4-16 x 2 1/4 | 3/4-16x2 1/4 fine 12-point flange screw alloy pln b18.2.1 | 15 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-16 x 5 | 3/8-16x5 coarse 12-point flange screw alloy pln b18.2.1 | 15 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 7/16-20 x 2 1/2 | fine 12-point fl/b b18.2.1 | 25 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/8-11 x 1 1/4 | coarse 12-point fl/b b18.2.1 | 210 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-16 x 3 1/2 | coarse 12-point fl/b b18.2.1 | 10 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/2-20 x 1 3/4 | fine 12-point fl/b b18.2.1 | 195 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/2-13 x 5 | coarse 12-point fl/b b18.2.1 | 25 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/4-28 x 2 | fine 12-point fl/b b18.2.1 | 100 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-24 x 3 1/4 | fine 12-point fl/b b18.2.1 | 50 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/4-28 x 2 1/4 | fine 12-point fl/b b18.2.1 | 100 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-16 x 2 1/4 | coarse 12-point fl/b b18.2.1 | 9 |
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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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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 7/8-9 x 2 1/4 | 7/8-9x2 1/4 coarse 12-point flange screw alloy pln b18.2.1 | 16 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/8-18 x 2 3/4 | 5/8-18x2 3/4 fine 12-point flange screw alloy pln b18.2.1 | 5 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 7/16-14 x 2 1/2 | 7/16-14x2 1/2 coarse 12-point flange screw alloy pln b18.2.1 | 25 |
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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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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/8-18 x 3 1/2 | 5/8-18x3 1/2 fine 12-point flange screw alloy pln b18.2.1 | 10 |
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| ASMC | IL | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/2-20 x 3 | 1/2-20x3 fine 12-point flange screw alloy pln b18.2.1 | 8 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/4-20 x 1 1/4 | 1/4-20 x 1 1/4 12 point cap screw alloy b18.2.1 | 25 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/4-20 x 1 1/2 | 1/4-20 x 1 1/2 12 point cap screw alloy b18.2.1 | 25 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/4-20 x 1 1/2 | 1/4-20 x 1 1/2 12 point cap screw alloy b18.2.1 | 50 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/4-28 x 1 1/4 | 1/4-28 x 1 1/4 12 point cap screw alloy b18.2.1 | 100 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/4-28 x 1 1/2 | 1/4-28 x 1 1/2 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 | 5/16-18 x 1 12 point cap screw alloy b18.2.1 | 100 |
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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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| 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 2 | 5/16-18 x 2 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 3/4 | 5/16-18 x 3/4 12 point cap screw alloy b18.2.1 | 100 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-24 x 1 | 5/16-24 x 1 12 point cap screw alloy b18.2.1 | 75 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-24 x 7/8 | 5/16-24 x 7/8 12 point cap screw alloy b18.2.1 | 25 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-16 x 1 | 3/8-16 x 1 12 point cap screw alloy b18.2.1 | 140 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-24 x 1/2 | 5/16-24 x 1/2 12 point cap screw alloy b18.2.1 | 100 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-24 x 1 | 3/8-24 x 1 12 point cap screw alloy b18.2.1 | 40 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-24 x 1 1/4 | 3/8-24 x 1 1/4 12 point cap screw alloy b18.2.1 | 60 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-24 x 1 1/4 | 3/8-24 x 1 1/4 12 point cap screw alloy b18.2.1 | 20 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-24 x 1 1/2 | 3/8-24 x 1 1/2 12 point cap screw alloy b18.2.1 | 50 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-24 x 1 3/4 | 3/8-24 x 1 3/4 12 point cap screw alloy b18.2.1 | 30 |
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| Ababa | CA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-24 x 2 | 3/8-24 x 2 12 point cap screw alloy b18.2.1 | 15 |
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| QFC | TX | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/2 x 1 1/4 | 1/2x1 1/4nc ferry head cap screw b18.2.1 | 100 |
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| QFC | TX | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/2-13 x 1 1/2 | 1/2-13x1 1/2 ferry head c/s alloy plain b18.2.1 | 800 |
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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/4 | 1/4 counterbore # csc55655 b18.2.1 | 1 |
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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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| 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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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/16-24 x 1 | 5/16-24 x 1 12 pt flange bolts b18.2.1 | 54 |
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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-16 x 1 3/4 | 3/8-16 x 1 3/4 12 pt flange bolts b18.2.1 | 2 |
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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 3/8-16 x 4 3/4 | 3/8-16 x 4 3/4 12 pt flange bolts b18.2.1 | 104 |
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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/2-13 x 1 1/4 | 1/2-13 x 1 1/4 12 pt flange bolts b18.2.1 | 25 |
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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/2-13 x 2 1/2 | 1/2-13 x 2 1/2 12 pt flange bolts b18.2.1 | 25 |
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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 1/2-20 x 2 1/2 | 1/2-20 x 2 1/2 12 pt flange bolts b18.2.1 | 65 |
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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Grade 8 | Plain | 9/16-18 x 1 1/2 | 9/16-18 x 1 1/2 12 pt flange bolts gr 8 plain b18.2.1 | 1 |
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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/8-11 x 1 3/4 | 5/8-11 x 1 3/4 12 pt flange bolts b18.2.1 | 44 |
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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/8-18 x 2 | 5/8-18 x 2 12 pt flange bolts b18.2.1 | 17 |
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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 5/8-18 x 2 1/2 | 5/8-18 x 2 1/2 12 pt flange bolts b18.2.1 | 28 |
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| B & K FAST | PA | 12 Point Flange Screw (CounterBore) | Steel | Plain | 7/8-14 x 4 | 7/8-14 x 4 12 pt flange bolts b18.2.1 | 1 |
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