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1/4-28 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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SupplierLocTypeMaterialFinishSizeDescriptionQty 
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JET FITTINGCAMachine ScrewBrassPlain1/4-28 x 1/4machine screw flat82 slotted 1/428x1/4 brass undercut b18.6.3330
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B & K FASTPAMachine ScrewAluminumPlain1/4-28 x 1/41/4-28 x 1/4 slotted oval machine screws alum b18.6.3494
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JET FITTINGCAMachine ScrewBrassPlain1/4-28 x 5/16machine screw flat82 slotted 1/428x5/16 brass undercut b18.6.3382
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JET FITTINGCAMachine ScrewSteelCadmium/Yellow1/4-28 x 5/16machine screw pan phillips 1/428x5/16 steel cadmium ii yellow b18.6.31100
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AbabaCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 3/81/4-28 x 3/8 s-flat m/s u/cut s/s b18.6.3300
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 3/8machine screw pan phillips 1/428x3/8 stainless steel b18.6.3825
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GLFOHMachine ScrewSteelCadmium/Yellow1/4-28 x 3/8screw MS35266-77 b18.6.3 () ()19
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QFCTXMachine ScrewSteelZinc/Clear1/4-28 x 3/81/4-28x3/8 phil pan m/s zinc b18.6.3536
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WSBKYMachine ScrewSteelZinc/Cleare/screw ms hex st (zt) slt 1/4-28x3/8 b18.6.333,615
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BHAMALMachine ScrewSteelZinc/Clear1/4-28 x 3/81/4-28x3/8 phil pan m/s zn b18.6.330
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B & K FASTPAMachine ScrewSteelBlack Oxide1/4-28 x 1/21/4-28 x 1/2 phil oval machine screw blk oxide b18.6.3170
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B & K FASTPAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 1/21/4-28 x 1/2 phil pan machine screws stainless b18.6.3628
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GLFOHMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 1/21/4-28x1/2 slotted flat m/s 18-8 s/s b18.6.3 () ()340
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 1/21/4-28x1/2 phillips flat head machine screw 18-8 stainless steel b18.6.382
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ParkerAZMachine ScrewSuperalloy (Inconel, Hastelloy, Alloy 20)Passivated1/4-28 x 1/21/4-28 x 1/2 pan head mach 6-lobe screw-asme b18.6.3 .5 thread a286 hardened passivate w/precote 30 per nas5317e4-8 made in u.s.a.165
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CresMfgCTMachine ScrewSteelCadmium/Yellow1/4-28 x 1/21/4-28 x .50 drilled fillister steel cad type-2 class 3 (rev c) ms35266-79 b18.6.32,700
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CresMfgCTMachine ScrewSteelCadmium/Yellow1/4-28 x 1/21/4-28 x .500 ph pan steel cad type-2 class 3 (rev 3) ms35207-279 b18.6.31,600
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ASMCILMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 1/2(ft) fine phil pan ss18-8 b18.6.3759
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 1/21/4-28x1/2 ms phillips pan a2 (18-8) 773858 b18.6.3493
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ParkerAZMachine ScrewSuperalloy (Inconel, Hastelloy, Alloy 20)Passivated1/4-28 x 1/21/4-28 x 1/2 pan head mach 6-lobe screw-asme b18.6.3 .5 thread a286 hardened passivate w/precote 30 per nas5317e4-8 made in u.s.a.165
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GLFOHMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 1/21/4-28x1/2 phil pan m/s 18-8 s/s b18.6.3 () ()150
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AbabaCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 5/81/4-28 x 5/8 p-flat 100 deg m/s s/s b18.6.3278
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AbabaCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 5/81/4-28 x 5/8 p-pan m/s s/s b18.6.350
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JET FITTINGCAMachine ScrewSteelZinc/Clear1/4-28 x 5/8machine screw round slotted 1/428x5/8 steel zinc b18.6.3350
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 5/8machine screw pan phillips 1/428x5/8 stainless steel b18.6.3657
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GLFOHMachine ScrewSteelCadmium/Yellow1/4-28 x 5/8ms35207-280 b18.6.3 () ()1000
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GLFOHMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Passivated1/4-28 x 5/8machine screw 304ss MS51960-83 b18.6.3 () ()50
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 5/81/4-28 x 5/8 phil pan ms ss b18.6.314240
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All SizeTXMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 5/81/4-28 x 5/8 slotted pan machine screw s/s b18.6.370
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Mid-ValleyCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 5/8machine screw b18.6.3inquire
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Passivated1/4-28 x 5/8ms24693-c295 1/4-28 x 5/8 phillips flat m/s 100 deg s/s 304ss MS24693-C295 b18.6.3409
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Passivated1/4-28 x 5/8ms51958-80 1/4-28 x 5/8 phillips pn ms s/s 304ss MS51958-80 b18.6.3300
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AbabaCAMachine ScrewSteelZinc/Yellow1/4-28 x 3/41/4-28 x 3/4 p-flat 100 deg m/s stl yel znc b18.6.3200
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AbabaCAMachine ScrewSteelNickel1/4-28 x 3/41/4-28 x 3/4 s-oval m/s stl nkl b18.6.3138
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 3/4machine screw flat100 phillips 1/428x3/4 stainless steel b18.6.3950
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 3/4machine screw flat82 phillips 1/428x3/4 stainless steel b18.6.3180
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JET FITTINGCAMachine ScrewSteelZinc/Clear1/4-28 x 3/4machine screw truss phillips 1/428x3/4 steel zinc b18.6.3167
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QFCTXMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 3/41/4-28x3/4 phil pan m/s 18-8 b18.6.375
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 3/41/4-28x3/4 phil flat ms ss b18.6.317576
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GLFOHMachine ScrewSteelZinc/Clear1/4-28 x 3/41/4-28x3/4 phil flat m/s stl zc b18.6.3 () ()721
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GLFOHMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Passivated1/4-28 x 3/4machine screw 304ss MS51958-81 b18.6.3 () ()15
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StandardMAMachine Screw316, 317, A4 StainlessPlain1/4-28 x 3/41/4-28x3/4 phillips truss head machine screw 316 stainless steel b18.6.39790
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StandardMAMachine Screw316, 317, A4 StainlessPlain1/4-28 x 3/41/4-28x3/4 phillips pan head machine screw 316 stainless steel b18.6.39911
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 3/41/4-28x3/4 phillips truss head machine screw 18-8 stainless steel b18.6.33100
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 3/41/4-28x3/4 phillips flat head machine screw 18-8 stainless steel b18.6.316400
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KBSTNMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 3/41/4-28 x 3/4 phil pan m/s s/s b18.6.33,800
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 3/41/4-28x3/4 phillips flat100 machine screw stainless steel 18-8 plain 1-PXM-25F-75 b18.6.3950
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GLFOHMachine ScrewSteelCadmium/Yellow1/4-28 x 25/32screw MS27039-4-12 b18.6.3 () ()289
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B & K FASTPAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 7/81/4-28 x 7/8 phil pan machine screws 18-8 ss b18.6.3200
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GLFOHMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 7/81/4-28x7/8 phil flat 100-deg m/s 18-8 s/s b18.6.3 () ()387
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AbabaCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 11/4-28 x 1 p-pan m/s s/s b18.6.350
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B & K FASTPAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 11/4-28 x 1 phil flat machine screws 18-8 ss b18.6.384
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 11/4-28x1 phil flat ms s/s b18.6.320740
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Marine FastenersFLMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 11/4-28x1 phil pan ms s/s b18.6.315200
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StandardMAMachine Screw316, 317, A4 StainlessPlain1/4-28 x 11/4-28x1 phillips pan head machine screw 316 stainless steel b18.6.319973
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 11/4-28x1 phillips truss head machine screw 18-8 stainless steel b18.6.35118
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StandardMAMachine Screw316, 317, A4 StainlessPlain1/4-28 x 11/4-28x1 phillips truss head machine screw 316 stainless steel b18.6.32107
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 11/4-28x1 phillips pan head machine screw 18-8 stainless steel b18.6.3238
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StandardMAMachine Screw316, 317, A4 StainlessPlain1/4-28 x 11/4-28x1 phillips flat head machine screw 316 stainless steel b18.6.310220
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 1 1/4machine screw pan phillips 1/428x1-1/4 stainless steel b18.6.3974
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GLFOHMachine ScrewSteelCadmium/Yellow1/4-28 x 1 1/4screw MS24693-S300 b18.6.3 () ()185
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GL FOHMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Passivated1/4-28 x 1 1/4machine screw 304ss MS51960-87 b18.6.3 () ()90
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FACCAOntMachine ScrewBrassPlain1/4-28 x 1 1/4machine screw round slot head 1/4-28 unf x 1 1/4 lg brass plain finish ansi b18-6.3-1972 b18.6.315,240
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AbabaCAMachine ScrewSteelZinc/Yellow1/4-28 x 1 5/161/4-28 x 1 5/16 p-flat 100 deg m/s stl yel znc b18.6.34019
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AbabaCAMachine ScrewSteelZinc/Clear1/4-28 x 1 3/81/4-28 x 1 3/8 p-flat 100 deg m/s stl znc b18.6.3966
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AbabaCAMachine ScrewSteelZinc/Clear1/4-28 x 1 3/81/4-28 x 1 3/8 p-flat 100 deg m/s stl znc b18.6.350
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 1 1/2machine screw pan phillips 1/428x1-1/2 stainless steel b18.6.3459
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 1 1/21/4-28x1-1/2 phillips flat head machine screw 18-8 stainless steel b18.6.34609
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 1 1/21/4-28x1-1/2 phillips pan head machine screw 18-8 stainless steel b18.6.310135
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JET FITTINGCAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 1 7/8machine screw pan phillips 1/428x1-7/8 stainless steel b18.6.3128
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StandardMAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 21/4-28x2 phillips flat head machine screw 18-8 stainless steel b18.6.32
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JET FITTINGCAMachine ScrewBrassPlain1/4-28 x 2 1/4machine screw flat82 slotted 1/428x2-1/4 brass b18.6.3119
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CresMfgCTMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Passivated1/4-28 x 2 1/41/4-28 x 2.25 ph flat 82 ss passivate ams2700 method 1 class 4 dfars (rev d) ms51960-91 b18.6.31,000
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GLFOHMachine ScrewGrade 5Zinc/Clear1/4-28 x 2.301/4-28x2.30 special phil flat m/s grade 5 stl zc b18.6.3 () ()690
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JET FITTINGCAMachine ScrewBrassPlain1/4-28 x 3machine screw flat82 phillips 1/428x3 brass b18.6.3314
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B & K FASTPAMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28 x 31/4-28 x 3 slotted round machine screws 18-8 ss b18.6.34
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B & K FASTPAMachine ScrewSteelPlain1/4-28 x 4 7/81/4-28 x 4 7/8 non-countersunk flat head machine screws 90 bend & 2 thread b18.6.32706
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THRDFASTALMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28nfx2 1/2 18-8 ss phil flat m/s b18.6.310
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THRDFASTALMachine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain1/4-28nfx2 18-8 ss phil flat m/s b18.6.310
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