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1/2 Machine Screws (ASME B18. 6.3)

Machine Screws are uniformly threaded screws which are designed to be screwed into pre-drilled, pre-threaded holes, or in conjunction with a nut, usually with a diameter less than 1/4inch. Larger diameter machine screws with a hex head are usually referred to as machine bolts.

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JET FITTINGCAMachine ScrewSteelZinc/Clear1/2-24 x 1/4machine screw flat82 slotted 1224x1/4 steel zinc b18.6.31030
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JET FITTINGCAMachine ScrewBrassPlain1/2-24 x 1/4machine screw round slotted 1224x1/4 brass b18.6.3510
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JET FITTINGCAMachine ScrewSteelZinc/Clear1/2-24 x 3/8machine screw flat82 slotted 1224x3/8 steel zinc b18.6.3320
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JET FITTINGCAMachine ScrewBrassPlain1/2-24 x 3/8machine screw round slotted 1224x3/8 brass b18.6.3815
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-24 x 3/8machine screw pan phillips 1224x3/8 stainless steel b18.6.3200
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JET FITTINGCAMachine ScrewSteelZinc/Clear1/2-24 x 3/8machine screw pan phillips 1224x3/8 steel zinc b18.6.32160
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-24 x 3/8machine screw flat82 phillips 1224x3/8 stainless steel undercut b18.6.3500
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-24 x 1/2machine screw pan phillips 1224x1/2 stainless steel b18.6.31000
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JET FITTINGCAMachine ScrewBrassPlain1/2-24 x 5/8machine screw fillister slotted 1224x5/8 brass b18.6.3230
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JET FITTINGCAMachine ScrewBrassPlain1/2-24 x 5/8machine screw round slotted 1224x5/8 brass b18.6.3368
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JET FITTINGCAMachine ScrewSteelZinc/Clear1/2-24 x 3/4machine screw pan phillips 1224x3/4 steel zinc b18.6.31350
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JET FITTINGCAMachine ScrewBrassPlain1/2-24 x 3/4machine screw round slotted 1224x3/4 brass b18.6.3277
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JET FITTINGCAMachine ScrewSteelZinc/Clear1/2-24 x 3/4machine screw flat82 slotted 1224x3/4 steel zinc b18.6.32800
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THRDFASTFLMachine ScrewSteelZinc/Clear1/2-13 x 3/4slotted flat m/s b18.6.3246
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THRDFASTFLMachine ScrewBrassPlain1/2-13 x 3/4slotted flat m/s b18.6.346
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THRDFASTFLMachine ScrewSteelZinc/Clear1/2-13 x 3/4slotted truss m/s b18.6.350
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 3/41/2-13x3/4 slotted flat head machine screw 18-8 stainless steel b18.6.32763
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THRDFASTALMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 3/418-8 ss slotted flat m/s b18.6.330
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JET FITTINGCAMachine ScrewBrassPlain1/2-24 x 7/8machine screw fillister slotted 1224x7/8 brass b18.6.3307
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JET FITTINGCAMachine ScrewBrassPlain1/2-24 x 7/8machine screw round slotted 1224x7/8 brass b18.6.3290
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GLFOHMachine Screw316, 317, A4 StainlessPlain1/2-13 x 11/2-13x1 slotted flat m/s 316 s/s b18.6.3 () ()6
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THRDFASTFLMachine ScrewSteelZinc/Clear1/2-13 x 1slotted round m/s b18.6.3286
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 11/2-13 x 1 slotted flat ms ss b18.6.3408
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 11/2-13x1 slotted flat head machine screw 18-8 stainless steel b18.6.32715
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StandardMAMachine ScrewBrassPlain1/2-13 x 11/2-13x1 phillips flat head machine screw brass b18.6.3367
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 11/2-13x1 slotted round head machine screw 18-8 stainless steel b18.6.3908
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OSSCORIMachine ScrewSteelZinc/Clear1/2-13 x 11/2-13x1 slotted round m/s plated b18.6.357
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Bostwick INMachine ScrewBrassPlain1/2-13 x 11/2-13 x 1 slotted flat m/s brass b18.6.350
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THRDFASTFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 118-8 ss slotted flat m/s b18.6.37
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QFCTXMachine ScrewSteelZinc/Clear1/2-13 x 1 1/41/2-13x1 1/4 hwh m/s serrated zinc b18.6.3300
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QFSMIMachine ScrewBrassPlain1/2-13 x 1 1/4slotted flat head b18.6.323
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THRDFASTFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 1/418-8 ss slotted flat m/s b18.6.317
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Marine FastenersFLMachine Screw316, 317, A4 StainlessPlain1/2-13 x 1 1/41/2-13 x 1 1/4 slt flat ms 316 b18.6.31680
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 1/41/2-13x1-1/4 slotted flat head machine screw 18-8 stainless steel b18.6.31831
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StandardMAMachine ScrewBrassPlain1/2-13 x 1 1/41/2-13x1-1/4 phillips flat head machine screw brass b18.6.31249
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MMFMIMachine ScrewSteelCadmium/Yellow1/2-13 x 1 1/41/2-13 x 1-1/4 phil flat stl/cad machine screw w patch usa ms35190-343l b18.6.3110
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OSSCORIMachine ScrewSteelZinc/Clear1/2-13 x 1 1/41/2-13x1 1/4 slotted flat m/s plated b18.6.3232
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THRDFASTOKMachine ScrewSteelGalvanized1/2-13 x 1 1/4slotted flat m/s hdg b18.6.311
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THRDFASTALMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 1/418-8 ss slotted flat m/s b18.6.397
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THRDFASTFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 1/418-8 ss slotted flat m/s b18.6.35
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THRDFASTMSMachine ScrewBrassPlain1/2-13 x 1 1/4slotted flat m/s b18.6.36
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JET FITTINGCAMachine ScrewBrassPlain1/2-24 x 1 1/2machine screw fillister slotted 1224x1-1/2 brass b18.6.3454
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JET FITTINGCAMachine ScrewSteelZinc/Clear1/2-24 x 1 1/2machine screw round slotted 1224x1-1/2 steel zinc b18.6.32790
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QFCTXMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 1/21/2-13x1-1/2 slotted round head m/s 18-8 b18.6.31
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 1/21/2-13x1-1/2 slotted flat ms ss b18.6.31014
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 1/21/2-13x1-1/2 phil flat ms 18-8 b18.6.3763
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CascadeORMachine ScrewBrassPlain1/2-13 x 1 1/2slotted flat b18.6.31200
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THRDFASTFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 1/218-8 ss slotted flat m/s b18.6.31
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THRDFASTFLMachine ScrewSteelZinc/Clear1/2-13 x 1 1/2slotted flat m/s b18.6.31
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StandardMAMachine ScrewBrassPlain1/2-13 x 1 1/21/2-13x1-1/2 phillips flat head machine screw brass b18.6.31157
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 1/21/2-13x1-1/2 slotted round head machine screw 18-8 stainless steel b18.6.356
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BHAMALMachine ScrewSteelZinc/Clear1/2-13 x 1 1/21/2-13x1 1/2 slotted flat m/s zn b18.6.366
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BHAMALMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 1/21/2-13x1 1/2 slotted flat m/s 300 ser ss b18.6.313
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OSSCORIMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 1/21/2-13x1 1/2 slotted flat m/s 18-8 304 b18.6.320
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THRDFASTFLMachine ScrewBrassPlain1/2-13 x 1 1/2slotted round m/s b18.6.319
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THRDFASTALMachine Screw316, 317, A4 StainlessPlain1/2-13 x 1 1/2t-316 ss slotted flat m/s b18.6.35
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JET FITTINGCAMachine ScrewSteelZinc/Clear1/2-24 x 1 3/4machine screw flat82 slotted 1224x1-3/4 steel zinc b18.6.3338
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JET FITTINGCAMachine ScrewBrassPlain1/2-24 x 1 3/4machine screw fillister slotted 1224x1-3/4 brass b18.6.3106
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JET FITTINGCAMachine ScrewBrassPlain1/2-24 x 1 3/4machine screw round slotted 1224x1-3/4 brass b18.6.3355
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B & K FASTPAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 3/41/2-13 x 1 3/4 slotted flat machine screw 18-8 ss b18.6.373
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QFSMIMachine ScrewBrassPlain1/2-13 x 1 3/4slotted flat head b18.6.315
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THRDFASTFLMachine Screw316, 317, A4 StainlessPlain1/2-13 x 1 3/4t-316 ss slotted flat m/s b18.6.3116
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 3/41/2-13 x 1-3/4 slotted flat ms ss b18.6.32310
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 3/41/2-13x1-3/4 slotted flat head machine screw 18-8 stainless steel b18.6.374
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Bostwick INMachine ScrewGrade 5Plain1/2-13 x 1 3/41/2-13 x 1 3/4 slotted flat m/s gr 5 b18.6.311
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THRDFASTALMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 1 3/418-8 ss slotted flat m/s b18.6.39
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JET FITTINGCAMachine ScrewBrassPlain1/2-24 x 2machine screw round slotted 1224x2 brass b18.6.3200
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JET FITTINGCAMachine ScrewSteelZinc/Clear1/2-24 x 2machine screw round slotted 1224x2 steel zinc b18.6.3104
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-24 x 2machine screw flat82 phillips 1224x2 stainless steel b18.6.3150
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 21/2-13x2 slotted flat ms ss b18.6.32343
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CascadeORMachine ScrewBrassPlain1/2-13 x 2flat slotted b18.6.3220
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THRDFASTFLMachine ScrewSteelZinc/Clear1/2-13 x 2slotted round m/s b18.6.336
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Chrome1/2-13 x 21/2-13 x 2 phil flat ms 18-8ss/bright chrome b18.6.31286
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StandardMAMachine ScrewSilicon BronzePlain1/2-13 x 21/2-13x2 slotted flat head machine screw silicon bronze b18.6.3455
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StandardMAMachine ScrewBrassPlain1/2-13 x 21/2-13x2 phillips flat head machine screw brass b18.6.31160
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THRDFASTALMachine ScrewSteelCadmium1/2-13 x 2slotted flat m/s b18.6.3 domestic3
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OSSCORIMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 21/2-13x2 slotted flat m/s 18-8 304 b18.6.323
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J&L INMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 21/2-13 X 2 STAINLESS FLAT HD M/S SLOTTED b18.6.3209
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THRDFASTOKMachine ScrewSteelZinc/Clear1/2-13 x 2slotted flat m/s domestic b18.6.3339
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THRDFASTALMachine ScrewSteelZinc/Clear1/2-13 x 2slotted round m/s b18.6.339
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JET FITTINGCAMachine ScrewSteelZinc/Clear1/2-24 x 2 1/4machine screw flat82 slotted 1224x2-1/4 steel zinc b18.6.3144
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JET FITTINGCAMachine ScrewSteelZinc/Clear1/2-24 x 2 1/4machine screw fillister slotted 1224x2-1/4 steel zinc b18.6.3444
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QFSMIMachine ScrewBrassPlain1/2-13 x 2 1/2slotted flat head b18.6.341
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THRDFASTFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 2 1/218-8 ss slotted flat m/s b18.6.323
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 2 1/21/2-13 x 2-1/2 slotted flat ms ss b18.6.3630
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Marine FastenersFLMachine Screw316, 317, A4 StainlessPlain1/2-13 x 2 1/21/2-13 x 2-1/2 sl flat ms 316 b18.6.3590
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StandardMAMachine ScrewSilicon BronzePlain1/2-13 x 2 1/21/2-13x2-1/2 slotted flat head machine screw silicon bronze b18.6.3609
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JET FITTINGCAMachine ScrewSteelZinc/Clear1/2-24 x 2 3/4machine screw flat82 slotted 1224x2-3/4 steel zinc b18.6.3288
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Bostwick INMachine ScrewSteelZinc/Clear1/2-13 x 2 3/41/2-13 x 2 3/4 slotted flat m/s zinc b18.6.355
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 31/2-13x3 slotted flat ms ss b18.6.31055
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QFSMIMachine ScrewBrassPlain1/2-13 x 3slotted flat head b18.6.315
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THRDFASTFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 318-8 ss slotted flat m/s b18.6.31
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THRDFASTOKMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 318-8 ss slotted flat m/s b18.6.315
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Bostwick INMachine ScrewSteelZinc/Clear1/2-13 x 31/2-13 x 3 slotted flat m/s zinc b18.6.325
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BHAMALMachine ScrewSteelZinc/Clear1/2-13 x 31/2-13x3 round slotted m/s zinc b18.6.38
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THRDFASTMSMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 318-8 ss slotted round m/s b18.6.39
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THRDFASTALMachine ScrewSteelZinc/Clear1/2-13 x 3slotted round m/s b18.6.36
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Marine FastenersFLMachine ScrewSilicon BronzePlain1/2-13 x 3 1/21/2-13x3-1/2 slotted fl ms 655brz b18.6.31487
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 3 1/21/2-13x3-1/2 slotted flat ms ss b18.6.3910
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StandardMAMachine ScrewSilicon BronzePlain1/2-13 x 3 1/21/2-13x3-1/2 slotted flat head machine screw silicon bronze b18.6.31138
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THRDFASTMSMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 3 1/218-8 ss slotted flat m/s b18.6.310
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THRDFASTFLMachine ScrewSteelZinc/Clear1/2-13 x 4slotted flat m/s b18.6.320
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THRDFASTFLMachine ScrewSteelZinc/Clear1/2-13 x 4slotted round m/s b18.6.313
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OSSCORIMachine ScrewSteelZinc/Clear1/2-13 x 41/2-13x4 slotted round m/s plated b18.6.32
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Marine FastenersFLMachine ScrewSilicon BronzePlain1/2-13 x 51/2-13x5 slotted flat head m/s silicon bronze bulk-generic brand b18.6.3155
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 51/2-13x5 slotted flat head machine screw 18-8ss b18.6.31575
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 51/2-13x5 slotted flat head m/s 18-8 ss 1 per small bag 5 small bags per master pack-generic brand b18.6.3117
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THRDFASTFLMachine ScrewSteelZinc/Clear1/2-13 x 5slotted flat m/s b18.6.33
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JET FITTINGCAMachine ScrewSteelPlain1/2-13 x 51/2-13x5 ms round sltzn 583991 b18.6.325
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B & K FASTPAMachine ScrewSteelZinc/Clear1/2-13 x 61/2-13 x 6 slotted flat machine screws zinc b18.6.31
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 61/2-13x6 slotted flat ms ss b18.6.3980
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THRDFASTFLMachine ScrewSteelZinc/Clear1/2-13 x 6slotted round m/s b18.6.3109
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QFCTXMachine ScrewSteelZinc/Clear1/2 x 61/2x6 round slotted m/s zinc b18.6.3240
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BHAMALMachine ScrewSteelZinc/Clear1/2-13 x 61/2-13x6 slotted round m/s zn b18.6.390
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OSSCORIMachine ScrewSteelZinc/Clear1/2-13 x 61/2-13x6 slotted round m/s plated b18.6.321
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Bostwick INMachine ScrewSteelZinc/Clear1/2-13 x 61/2-13 x 6 slotted flat m/s zinc b18.6.325
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THRDFASTALMachine ScrewSteelZinc/Clear1/2-13 x 6slotted round m/s b18.6.35
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Marine FastenersFLMachine ScrewSilicon BronzePlain1/2-13 x 81/2-13 x 8 slotted flat m/s sil brz bulk-generic brand b18.6.347
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THRDFASTFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/2-13 x 8 1/218-8 ss slotted flat m/s b18.6.399
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AbabaCAMachine ScrewSteelPlain1/21/2 countersink 82 deg b18.6.36
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AbabaCAMachine ScrewSteelPlain1/21/2 countersink 82 deg b18.6.32
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