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#4 Flat Head Cap Screws (ASME B18. 3)
Flat Head Socket Cap Screws are designed to be seated in countersunk holes, and align flush with the surface of the assembly when installed. Flat head socket cap screws have a flat top surface, an indented hex and a conical bearing surface with a head angle of 82°. Flat head socket cap screws are commonly used in machine parts, die fixturing, and clamping.
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| Buy Flat Head Cap Screws from one of our FCH Network Members | ||||||||
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| Supplier | Loc | Type | Material | Finish | Size | Description | Qty | |
| GLF | OH | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1/4 | #4-40x1/4 flat stl pln b18.2.1 b18.3 () () () | 993 |
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| GLF | OH | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 3/8 | #4-40x3/8 flat 18-8 s/s b18.2.1 b18.3 () () () | 406 |
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| GLF | OH | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 5/16 | #4-40x5/16 flat stl pln b18.2.1 b18.3 () () () | 1279 |
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| BHAM | AL | Flat Head Socket Cap Screw | Steel | Black Oxide | #4-48 x 3/4 | 4-48x3/4 flat soc c/s alloy black ox b18.2.1 b18.3 | 101 |
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| BHAM | AL | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 3/8 | 4-40x3/8 flat hdsoc cap dom b18.2.1 b18.3 | 100 |
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| Irwin Ind | Ont | Flat Head Socket Cap Screw | Steel | Zinc/Black | #4-40 x 1/4 | 4-40 x 1/4 flat steel soc cap .0002 min zinc trivalent black b18.2.1 b18.3 | 836 |
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| Irwin Ind | Ont | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 3/8 | 4-40 x 3/8 flat soc c/s b18.2.1 b18.3 | 2500 |
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| Irwin Ind | Ont | Flat Head Socket Cap Screw | Steel | Zinc/Black | #4-40 x 1/2 | 4-40 x 1/2 flat steel soc cap .0002 min zinc trivalent black b18.2.1 b18.3 | 400 |
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| Irwin Ind | Ont | Flat Head Socket Cap Screw | Steel | Zinc/Black | #4-40 x 5/16 | 4-40 x 5/16 flat soc c/s stl .0002 min zinc trivalent black b18.2.1 b18.3 | 2200 |
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| Irwin Ind | Ont | Flat Head Socket Cap Screw | Steel | Zinc/Black | #4-40 x 3/8 | 4-40 x 3/8 flat soc c/s stl .0002 min zinc trivalent black b18.2.1 b18.3 | 4700 |
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| Irwin Ind | Ont | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1/4 | 4-40x1/4 flat socket capscrew plain b18.2.1 b18.3 | 1700 |
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| Irwin Ind | Ont | Flat Head Socket Cap Screw | Steel | Zinc/Black | #4-40 x 3/4 | 4-40x3/4 flat socket capscrew alloy steel zinc triv black b18.2.1 b18.3 | 2500 |
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| GLF | OH | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1 1/4 | #4-40x1-1/4 flat stl pln b18.2.1 b18.3 () () () | 1550 |
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| Irwin Ind | Ont | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 3/4 | 4-40 x 3/4 flat socket capscrew ss b18.2.1 b18.3 | 1500 |
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| Ababa | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 3/16 | 4-40 x 3/16 flat soc cap screw alloy b18.2.1 b18.3 | 2530 |
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| Ababa | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 1/4 | 4-40 x 1/4 flat soc cap screw s/s b18.2.1 b18.3 | 427 |
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| Ababa | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1/4 | 4-40 x 1/4 flat soc cap screw alloy b18.2.1 b18.3 | 232 |
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| Ababa | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 5/16 | 4-40 x 5/16 flat soc cap screw s/s b18.2.1 b18.3 | 978 |
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| Ababa | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 5/16 | 4-40 x 5/16 flat soc cap screw alloy b18.2.1 b18.3 | 2100 |
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| Ababa | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 3/8 | 4-40 x 3/8 flat soc cap screw s/s b18.2.1 b18.3 | 513 |
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| Ababa | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 3/8 | 4-40 x 3/8 flat soc cap screw alloy b18.2.1 b18.3 | 322 |
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| Ababa | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 1/2 | 4-40 x 1/2 flat soc cap screw s/s b18.2.1 b18.3 | 400 |
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| Ababa | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1/2 | 4-40 x 1/2 flat soc cap screw alloy b18.2.1 b18.3 | 2000 |
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| Ababa | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 3/4 | 4-40 x 3/4 flat soc cap screw alloy b18.2.1 b18.3 | 185 |
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| Ababa | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1 | 4-40 x 1 flat soc cap screw alloy b18.2.1 b18.3 | 200 |
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| Ababa | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 3/16 | 4-40 x 3/16 flt soc cap s/s b18.2.1 b18.3 | 542 |
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| ASMC | IL | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 5/8 | #4-40x5/8 coarse socket flat hd cap screw ss18-8 b18.2.1 b18.3 | 1,864 |
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| ASMC | IL | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 3/16 | #4-40x3/16 unc socket flat hd cap screw ss18-8 b18.2.1 b18.3 | 5,700 |
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| ASMC | IL | Flat Head Socket Cap Screw | Steel | Plain | #4-48 x 1 | #4-48x1 (ft) fine socket flat hd cap screw alloy pln b18.2.1 b18.3 | 50 |
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| Ababa | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 1/4 | 4-40 x 1/4 flat soc cap screw s/s b18.2.1 b18.3 | 200 |
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| Ababa | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 5/16 | 4-40 x 5/16 flat soc cap screw s/s b18.2.1 b18.3 | 500 |
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| Ababa | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 5/16 | 4-40 x 5/16 flat soc cap screw alloy b18.2.1 b18.3 | 600 |
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| Ababa | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 3/8 | 4-40 x 3/8 flat soc cap screw s/s b18.2.1 b18.3 | 300 |
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| Ababa | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 3/8 | 4-40 x 3/8 flat soc cap screw alloy b18.2.1 b18.3 | 100 |
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| Ababa | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 1/2 | 4-40 x 1/2 flat soc cap screw s/s b18.2.1 b18.3 | 100 |
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| Ababa | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1/2 | 4-40 x 1/2 flat soc cap screw alloy b18.2.1 b18.3 | 85 |
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| Exim | S'pore | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Passivated | #4-40 x 1/4 | screw socket head hexs/s clear passivated w.flat round washer# 4-40 x 1/4 in b18.2.1 b18.3 | 50480 |
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| Exim | S'pore | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Passivated | #4-40 x 3/8 | screw socket cap sems t-10s/s passivated w/flat washer unc 2a# 4-40 x 3/8 in b18.2.1 b18.3 | 4702 |
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| Exim | S'pore | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Passivated | #4-40 x 1/2 | screw m/c socket cap sems t-10s/s passivated w/flat round washer# 4-40 x 1/2 in unc 2a b18.2.1 b18.3 | 3701 |
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| SII | IN | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 3/16 | #4-40x3/16 non-standard flat socket caps unc 18-8 304 a2 b18.2.1 b18.3 | 1900 |
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| JET FITTING | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 3/8 | 4-40x3/8 flat 18-8 212018 b18.2.1 b18.3 | 1521 |
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| JET FITTING | CA | Flat Head Socket Cap Screw | 316, 317, A4 Stainless | Plain | #4-40 x 1/2 | cap screw flat socket hex 4-40x1/2 stainless steel 316(a4) 063019 b18.2.1 b18.3 | 1800 |
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| JET FITTING | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 1/4 | 4-40x1/4 flat 18-8 212017 b18.2.1 b18.3 | 1906 |
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| JET FITTING | CA | Flat Head Socket Cap Screw | Steel | Black Oxide | #4-40 x 1/4 | #4-40x1/4 flat hdsock caps stl blk ox 211017 b18.2.1 b18.3 | 8494 |
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| CresMfg | CT | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Passivated | #4-40 x 5/8 | 4-40 x .625 hex socket flat 82 cl3a ss passivate ams2700 method 1 class 4 dfars (rev 2) ms24671-4 b18.2.1 b18.3 | 9,500 |
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| Standard | MA | Flat Head Socket Cap Screw | 316, 317, A4 Stainless | Plain | #4-40 x 1/4 | 4-40x1/4 socket flat point screw 316 stainless steel b18.2.1 b18.3 | 80218 |
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| Standard | MA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 2 | 4-40x2 flat head socket cap screw 18-8 stainless steel b18.2.1 b18.3 | 19725 |
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| Standard | MA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 3/8 | 4-40x3/8 flat head socket cap screw 18-8 stainless steel b18.2.1 b18.3 | 39521 |
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| Standard | MA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 5/16 | 4-40x5/16 flat head socket cap screw 18-8 stainless steel b18.2.1 b18.3 | 38800 |
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| Standard | MA | Flat Head Socket Cap Screw | 316, 317, A4 Stainless | Plain | #4-40 x 7/8 | 4-40x7/8 flat head socket cap screw 316 stainless steel b18.2.1 b18.3 | 16375 |
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| Standard | MA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 3/4 | 4-40x3/4 flat head socket cap screw 18-8 stainless steel b18.2.1 b18.3 | 17700 |
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| Standard | MA | Flat Head Socket Cap Screw | 316, 317, A4 Stainless | Plain | #4-40 x 5/8 | 4-40x5/8 flat head socket cap screw 316 stainless steel b18.2.1 b18.3 | 17240 |
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| Standard | MA | Flat Head Socket Cap Screw | 316, 317, A4 Stainless | Plain | #4-40 x 3/4 | 4-40x3/4 flat head socket cap screw 316 stainless steel b18.2.1 b18.3 | 14850 |
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| Standard | MA | Flat Head Socket Cap Screw | 316, 317, A4 Stainless | Plain | #4-40 x 1/2 | 4-40x1/2 flat head socket cap screw 316 stainless steel b18.2.1 b18.3 | 18360 |
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| Standard | MA | Flat Head Socket Cap Screw | 316, 317, A4 Stainless | Plain | #4-40 x 1 1/2 | 4-40x1-1/2 flat head socket cap screw 316 stainless steel b18.2.1 b18.3 | 5525 |
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| Standard | MA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 1/4 | 4-40x1/4 flat head socket cap screw 18-8 stainless steel b18.2.1 b18.3 | 13100 |
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| Standard | MA | Flat Head Socket Cap Screw | 316, 317, A4 Stainless | Plain | #4-40 x 1 | 4-40x1 flat head socket cap screw 316 stainless steel b18.2.1 b18.3 | 177 |
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| Standard | MA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 1 | 4-40x1 flat head socket cap screw 18-8 stainless steel b18.2.1 b18.3 | 16310 |
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| Standard | MA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 5/8 | 4-40x5/8 flat head socket cap screw 18-8 stainless steel b18.2.1 b18.3 | 8100 |
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| Standard | MA | Fl at Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 1/2 | 4-40x1/2 flat head socket cap screw 18-8 stainless steel b18.2.1 b18.3 | 2400 |
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| Standard | MA | Flat Head Socket Cap Screw | 316, 317, A4 Stainless | Plain | #4-40 x 1/4 | 4-40x1/4 flat head socket cap screw 316 stainless steel b18.2.1 b18.3 | 16650 |
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| Standard | MA | Flat Head Socket Cap Screw | 316, 317, A4 Stainless | Plain | #4-40 x 1/8 | 4-40x1/8 socket flat point screw 316 stainless steel b18.2.1 b18.3 | 22700 |
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| QFC | TX | Flat Head Socket Cap Screw | Steel | Zinc/Clear | #4 x 1/2 | #4x1/2 flat head hex socket cap screw zinc b18.2.1 b18.3 | 9000 |
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| QFC | TX | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 3/8 | 4/40x3/8 18-8ss flat hd skt cap b18.2.1 b18.3 | 400 |
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| B & K FAST | PA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1/4 | 4/40 x 1/4 flat hd socket cap screws b18.2.1 b18.3 | 200 |
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| B & K FAST | PA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 3/8 | 4/40 x 3/8 flat hd socket cap screws b18.2.1 b18.3 | 400 |
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| B & K FAST | PA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 1/4 | 4/40 x 1/4 flat socket cap screw 18-8 ss b18.2.1 b18.3 | 65 |
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| General F | MI | Flat Head Socket Cap Screw | Steel | Black Oxide | #4-40 x 3/8 | 4-40 x .375 fhcs soc alloy blk oxide b18.2.1 b18.3 | 2400 |
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| General F | MI | Flat Head Socket Cap Screw | Steel | Black Oxide | #4-40 x 3/8 | 4-40 x .375 fhcs 6-lobe blk chromate b18.2.1 b18.3 | 14350 |
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| OSSCO | RI | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 5/16 | 4-40x5/16 flat soc cap screw b18.2.1 b18.3 | 1,900 |
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| OSSCO | RI | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 3/8 | 4-40x3/8 flat soc cap screw b18.2.1 b18.3 | 834 |
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| OSSCO | RI | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1/2 | 4-40x1/2 flat soc cap screw b18.2.1 b18.3 | 450 |
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| OSSCO | RI | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 3/4 | 4-40x3/4 flat soc cap screw b18.2.1 b18.3 | 2,087 |
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| Bostwick | IN | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 3/8 | 4-40 x 3/8 flat soc cap screw (usa mfg) alloy b18.2.1 b18.3 | 264 |
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| Bostwick | IN | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1/2 | 4-40 x 1/2 flat soc cap screw (usa mfg) alloy b18.2.1 b18.3 | 296 |
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| Bostwick | IN | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 5/8 | 4-40 x 5/8 flat soc cap screw (usa mfg) alloy b18.2.1 b18.3 | 100 |
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| Bostwick | IN | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1 | 4-40 x 1 flat soc cap screw alloy b18.2.1 b18.3 | 200 |
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| Mid-Valley | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 3/16 | flat head socket cap screw b18.2.1 b18.3 | inquire |
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| JET FITTING | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1/4 | 4-40x1/4 (ft) flat hex socket cap screw alloy steel thermal black oxide and oil b18.2.1 b18.3 | 9530 |
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| JET FITTING | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 1/4 | cap screw flat socket 440x1/4 stainless steel b18.2.1 b18.3 | 2600 |
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| JET FITTING | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 3/8 | cap screw flat socket 440x3/8 alloy steel b18.2.1 b18.3 | 10 |
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| JET FITTING | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 3/8 | cap screw flat socket 440x3/8 stainless steel b18.2.1 b18.3 | 1100 |
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| JET FITTING | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1/2 | cap screw flat socket 440x1/2 alloy steel b18.2.1 b18.3 | 8261 |
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| JET FITTING | CA | Flat Head Socket Cap Screw | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 x 1 1/4 | cap screw flat socket 440x1-1/4 stainless steel b18.2.1 b18.3 | 1450 |
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| Wurth | Ont | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 5/8 | scr flt soc alloy 4-40x5/8 b18.2.1 b18.3 | 400 |
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| JET FITTING | CA | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 5/16 | cap screw flat socket 440x5/16 alloy steel b18.2.1 b18.3 | 2955 |
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| THRDFAST | FL | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 3/16 | flat socket c/s b18.2.1 b18.3 | 2,051 |
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| THRDFAST | FL | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 3/8 | flat socket c/s b18.2.1 b18.3 | 400 |
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| THRDFAST | FL | Flat Head Socket Cap Screw | Steel | Plain | #4-40 x 1/2 | flat socket c/s b18.2.1 b18.3 | 394 |
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