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5/8 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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SupplierLocTypeMaterialFinishSizeDescriptionQty 
GLFOHFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2 1/25/8-11x2-1/2 flat stl pln b18.2.1 b18.3 () () ()6
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GLFOHFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1 3/45/8-11x1-3/4 flat stl pln b18.2.1 b18.3 () () ()18
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GLFOHFlat Head Socket Cap ScrewSteelPlain5/8-11 x 25/8-11x2 flat stl pln b18.2.1 b18.3 () () ()64
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GLFOHFlat Head Socket Cap ScrewSteelPlain5/8-11 x 45/8-11x4 flat stl pln b18.2.1 b18.3 () () ()65
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GLFOHFlat Head Socket Cap ScrewSteelZinc/Clear5/8-11 x 25/8-11x2 flat stl zc b18.2.1 b18.3 () () ()528
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GLFOHFlat Head Socket Cap ScrewSteelZinc/Clear5/8-11 x 1 1/25/8-11x1-1/2 flat stl zc b18.2.1 b18.3 () () ()1384
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GLFOHFlat Head Socket Cap ScrewSteelPlain5/8-11 x 5 1/25/8-11x5-1/2-flat head-socket cap screw b18.2.1 b18.3 () () ()30
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BHAMALFlat Head Socket Cap ScrewASTM A449Plain5/8-11 x 45/8-11x4 flat soc cap scr a449 dom b18.2.1 b18.311
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BHAMALFlat Head Socket Cap ScrewSteelPlain5/8-11 x 45/8-11x4 flat soc cap scr b18.2.1 b18.327
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BHAMALFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 35/8-11x3 flat soc cap scr 300 ser ss b18.2.1 b18.3200
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GLFOHFlat Head Socket Cap ScrewSteelPlain5/8-11 x 35/8-11x3 flat stl pln b18.2.1 b18.3 () () ()45
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GLFOHFlat Head Socket Cap ScrewSteelPlain5/8-11 x 5 1/25/8-11x5-1/2 flat stl pln b18.2.1 b18.3 () () ()40
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GLFOHFlat Head Socket Cap ScrewGrade 5Zinc/Clear5/8-11 x 25/8-11x2 slotted flat hd c/s grade 5 stl zc b18.2.1 b18.3 () () ()50
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BIG BOLTILFlat Head Socket Cap ScrewSteelPlain5/8-11 x 8bolt & c/s square boltflat socket b18.3600
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BIG BOLTILFlat Head Socket Cap ScrewSteelPlain5/8-11 x 10 1/2bolt & c/s flat socket c/s socket b18.32000
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BIG BOLTILFlat Head Socket Cap ScrewSteelPlain5/8-11 x 6bolt & c/s flat socket c/s flat socket b18.3500
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BIG BOLTILFlat Head Socket Cap ScrewSteelPlain5/8-11 x 16bolt & c/s flat socket c/s flat socket b18.3200
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GLFOHFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1 1/25/8-11x1-1/2 flat stl pln b18.2.1 b18.3 () () ()104
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GLFOHFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1 1/45/8-11x1-1/4 flat stl pln b18.2.1 b18.3 () () ()1583
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AbabaCAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 15/8-11 x 1 flat soc cap screw alloy b18.2.1 b18.35
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AbabaCAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1 1/25/8-11 x 1 1/2 flat soc cap screw alloy b18.2.1 b18.335
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AbabaCAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 25/8-11 x 2 flat soc cap screw alloy b18.2.1 b18.3164
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AbabaCAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2 1/25/8-11 x 2 1/2 flat soc cap screw alloy b18.2.1 b18.3100
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AbabaCAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 35/8-11 x 3 flat soc cap screw alloy b18.2.1 b18.395
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AbabaCAFlat Head Socket Cap ScrewSteelPlain5/8-18 x 1 1/25/8-18 x 1 1/2 flt soc cap alloy b18.2.1 b18.354
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AbabaCAFlat Head Socket Cap ScrewSteelPlain5/8-18 x 25/8-18 x 2 flat soc cap screw alloy b18.2.1 b18.357
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AbabaCAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 3 1/25/8-11 x 3 1/2 flat soc cap screw alloy b18.2.1 b18.330
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ASMCILFlat Head Socket Cap ScrewSteelPlain5/8-11 x 85/8-11x8 (pt) coarse socket flat hd cap screw alloy pln b18.2.1 b18.39
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ASMCILFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1(ft) coarse socket flat hd c/s ss18-8 b18.3175
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AbabaCAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 25/8-11 x 2 flat soc cap screw alloy b18.2.1 b18.340
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AbabaCAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2 1/25/8-11 x 2 1/2 flat soc cap screw alloy b18.2.1 b18.310
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AbabaCAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 35/8-11 x 3 flat soc cap screw alloy b18.2.1 b18.315
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Alma BoltMIFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1 1/45/8-11 x 1 1/4 flat hd socket cap screw alloy b18.2.1 b18.3528
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Alma BoltMIFlat Head Socket Cap ScrewSteelPlain5/8-11 x 3 3/45/8-11 x 3 3/4 flat hd socket cap screw alloy b18.2.1 b18.3412
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StandardMAFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 2 1/25/8-11x2-1/2 flat head socket cap screw 18-8 stainless steel b18.2.1 b18.3345
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StandardMAFlat Head Socket Cap Screw316, 317, A4 StainlessPlain5/8-11 x 1 1/25/8-11x1-1/2 flat head socket cap screw 316 stainless steel b18.2.1 b18.3788
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StandardMAFlat Head Socket Cap Screw316, 317, A4 StainlessPlain5/8-11 x 15/8-11x1 flat head socket cap screw 316 stainless steel b18.2.1 b18.3886
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StandardMAFlat Head Socket Cap Screw316, 317, A4 StainlessPlain5/8-11 x 2 1/25/8-11x2-1/2 flat head socket cap screw 316 stainless steel b18.2.1 b18.3393
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StandardMAFlat Head Socket Cap Screw316, 317, A4 StainlessPlain5/8-11 x 25/8-11x2 flat head socket cap screw 316 stainless steel b18.2.1 b18.3360
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StandardMAFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 1/25/8-11x1-1/2 flat head socket cap screw 18-8 stainless steel b18.2.1 b18.3502
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StandardMAFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 25/8-11x2 flat head socket cap screw 18-8 stainless steel b18.2.1 b18.3481
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StandardMAFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 1/45/8-11x1-1/4 flat head socket cap screw 18-8 stainless steel b18.2.1 b18.352
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StandardMAFlat Head Socket Cap Screw316, 317, A4 StainlessPlain5/8-11 x 1 1/45/8-11x1-1/4 flat head socket cap screw 316 stainless steel b18.2.1 b18.3218
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StandardMAFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 35/8-11x3 flat head socket cap screw 18-8 stainless steel b18.2.1 b18.348
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QFCTXFlat Head Socket Cap ScrewSteelPlain5/8 x 1 1/45/8x1 1/4nc flat socket cap b18.2.1 b18.327
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QFCTXFlat Head Socket Cap ScrewSteelPlain5/8 x 1 3/45/8x1 3/4nc flat skt cap screw b18.2.1 b18.3150
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QFCTXFlat Head Socket Cap ScrewSteelPlain5/8-11 x 25/8-11x2 flat soc c/s alloy plain b18.2.1 b18.3300
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QFCTXFlat Head Socket Cap ScrewSteelPlain5/8-11 x 3 1/25/8-11x3 1/2 flat soc c/s plain b18.2.1 b18.347
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1 1/45/8-11 x 1 1/4 flat hd socket cap screws b18.2.1 b18.3903
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1 1/25/8-11 x 1 1/2 flat hd socket cap screws b18.2.1 b18.3498
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1 3/45/8-11 x 1 3/4 flat hd socket cap screws b18.2.1 b18.352
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 25/8-11 x 2 flat hd socket cap screws b18.2.1 b18.3140
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2 1/45/8-11 x 2 1/4 flat hd socket cap screws b18.2.1 b18.376
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2 1/25/8-11 x 2 1/2 flat hd socket cap screws b18.2.1 b18.350
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 35/8-11 x 3 flat hd socket cap screws b18.2.1 b18.382
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 3 1/25/8-11 x 3 1/2 flat hd socket cap screws b18.2.1 b18.3177
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 45/8-11 x 4 flat hd socket cap screw b18.2.1 b18.360
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 4 1/25/8-11 x 4 1/2 flat hd socket cap screws b18.2.1 b18.33
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 55/8-11 x 5 flat hd socket cap screw b18.2.1 b18.350
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 5 1/25/8-11 x 5 1/2 flat hd socket cap screws b18.2.1 b18.327
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-11 x 85/8-11 x 8 flat hd socket cap screw b18.2.1 b18.34
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-18 x 1 3/45/8-18 x 1 3/4 flat hd socket cap screws b18.2.1 b18.311
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B & K FASTPAFlat Head Socket Cap ScrewSteelPlain5/8-18 x 3 1/25/8-18 x 3 1/2 flat hd socket cap screws b18.2.1 b18.35
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B & K FASTPAFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 15/8-11 x 1 flat socket cap screws 18-8 ss b18.2.1 b18.321
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General FMIFlat Head Socket Cap ScrewSteelPlain5/8-11 x 35/8-11x3 flat soc b18.2.1 b18.3200
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OSSCORIFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1 1/25/8-11x1 1/2 flat soc cap screw b18.2.1 b18.325
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OSSCORIFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 45/8-11x4 flat soc cap screw 18-8 304 b18.2.1 b18.32
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QFCTXFlat Head Socket Cap ScrewSteelPlain5/8-11 x 45/8-11x4 flat soc c/s alloy plain b18.2.1 b18.389
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QFCTXFlat Head Socket Cap ScrewSteelPlain5/8-11 x 4 1/25/8-11x4 1/2 flat soc c/s alloy plain b18.2.1 b18.34
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QFCTXFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 1/25/8-11x1 1/2 flat soc c/s 18-8 b18.2.1 b18.319
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Bostwick INFlat Head Socket Cap ScrewSteelPlain5/8-11 x 55/8-11 x 5 flat soc cap screw alloy b18.2.1 b18.387
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Bostwick INFlat Head Socket Cap ScrewSteelPlain5/8-11 x 3/45/8-11 x 3/4 flat soc cap screw alloy b18.2.1 b18.394
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Bostwick INFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 15/8-11 x 1 flat soc cap screw 18-8 stainless b18.2.1 b18.381
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Bostwick INFlat Head Socket Cap ScrewSteelPlain5/8-11 x 15/8-11 x 1 flat soc cap screw alloy b18.2.1 b18.379
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Bostwick INFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2 1/25/8-11 x 2 1/2 flat soc cap screw (usa mfg) alloy b18.2.1 b18.323
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Bostwick INFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1 1/45/8-11 x 1 1/4 flat soc cap screw alloy nylon patc b18.2.1 b18.338
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Bostwick INFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2 3/45/8-11 x 2 3/4 flat soc cap screw alloy b18.2.1 b18.318
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Bostwick INFlat Head Socket Cap ScrewSteelPlain5/8-18 x 45/8-18 x 4 flat soc cap screw alloy b18.2.1 b18.36
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NWFASTTXFlat Head Socket Cap ScrewSteelBlack Oxide5/8-11 x 3 1/25/8-11 x 3 1/2 flat head socket cap screw alloy steel black oxide b18.2.1 b18.3552
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NWFASTTXFlat Head Socket Cap ScrewSteelBlack Oxide5/8-11 x 45/8-11 x 4 flat head socket cap screw alloy steel black oxide b18.2.1 b18.3629
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THRDFASTFLFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2 1/2flat socket c/s b18.2.1 b18.359
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THRDFASTFLFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1 3/4flat socket c/s b18.2.1 b18.357
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THRDFASTFLFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2flat socket c/s b18.2.1 b18.345
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THRDFASTFLFlat Head Socket Cap ScrewSteelPlain5/8-11 x 5flat socket c/s b18.2.1 b18.340
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THRDFASTFLFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 1/418-8 ss flat socket cap b18.2.1 b18.322
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THRDFASTFLFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 618-8 ss flat socket c/s b18.2.1 b18.38
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THRDFASTFLFlat Head Socket Cap ScrewSteelPlain5/8-11 x 4flat socket c/s b18.2.1 b18.38
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THRDFASTFLFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 2 1/218-8 ss flat socket cap b18.2.1 b18.33
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THRDFASTFLFlat Head Socket Cap ScrewSteelPlain5/8-11 x 7flat socket c/s b18.2.1 b18.32
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THRDFASTFLFlat Head Socket Cap ScrewSteelPlain5/8-11 x 3flat socket c/s b18.2.1 b18.31
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THRDFASTFLFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2flat socket c/s b18.2.1 b18.333
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THRDFASTFLFlat Head Socket Cap ScrewSteelPlain5/8-11 x 5flat socket c/s b18.2.1 b18.34
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THRDFASTOKFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1 3/4flat socket c/s b18.2.1 b18.3 domestic16
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THRDFASTOKFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2 1/4flat socket c/s b18.2.1 b18.3 domestic8
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THRDFASTOKFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2flat socket c/s b18.2.1 b18.3 domestic7
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THRDFASTOKFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2 1/4flat socket c/s b18.2.1 b18.325
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THRDFASTTNFlat Head Socket Cap ScrewSteelPlain5/8-11 x 3flat socket c/s b18.2.1 b18.336
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THRDFASTTNFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 1/218-8 ss flat socket cap b18.2.1 b18.35
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THRDFASTMSFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1flat socket c/s b18.2.1 b18.33
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THRDFASTMSFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 1/218-8 ss flat socket cap b18.2.1 b18.3100
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WSBKYFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1screw flat soc alloy 5/8-11x1 b18.2.1 b18.35,912
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All SizeTXFlat Head Socket Cap ScrewSteelPlain5/8-18 x 2 1/45/8-18 x 2 1/4 flat head socket cap b18.2.1 b18.31
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All SizeTXFlat Head Socket Cap ScrewSteelPlain5/8-11 x 1 1/45/8-11 x 1 1/4 flat head socket cap b18.2.1 b18.3160
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All SizeTXFlat Head Socket Cap ScrewSteelPlain5/8-11 x 4 1/25/8-11 x 4 1/2 flat head socket cap b18.2.1 b18.3109
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All SizeTXFlat Head Socket Cap ScrewSteelPlain5/8-11 x 55/8-11 x 5 flat head socket cap b18.2.1 b18.350
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All SizeTXFlat Head Socket Cap ScrewSteelPlain5/8-18 x 1 1/25/8-18 x 1 1/2 flat head socket cap b18.2.1 b18.3150
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All SizeTXFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 25/8-11 x 2 flat head socket cap s/s b18.2.1 b18.323
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All SizeTXFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 1/25/8-11 x 1 1/2 flat head socket cap s/s b18.2.1 b18.313
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All SizeTXFlat Head Socket Cap Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/8-11 x 1 3/45/8-11 x 1 3/4 flat head socket cap s/s b18.2.1 b18.317
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All SizeTXFlat Head Socket Cap ScrewSteelPlain5/8-11 x 2 3/45/8-11 x 2 3/4 flat head socket cap b18.2.1 b18.35
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