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4-40 Black-Oxide Socket Head Machine Screws

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Our Socket Head Machine Screws are the strongest screws we offer.  These screws are heat treated, have a black-oxide finish and exceed Grade 8 standards. These are the same screws that are supplied in our mechanical kits.  From 1.00” length and up these screws are not fully threaded.  Machined from high-strength alloy steel with a Rockwell hardness of C39-C45 and a minumum tensile strength of 180,000 psi. Length is measured from below the head.

4-40 Black-Oxide Socket Head Machine Screws
SKULengthWishlistPricePurchase
91251A1350.125" (1/8")
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91251A1050.1875" (3/16")
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91251A1060.250" (1/4")
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91251A1070.3125" (5/16")
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91251A1080.375" (3/8")
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91251A8310.4375" (7/16")
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91251A1100.500" (1/2")
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91251A1120.625" (5/8")
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91251A1130.750" (3/4")
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91251A1140.875" (7/8")
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91251A1151.00"
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91251A0781.250" (1-1/4")
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91251A1491.5" (1-1/2")
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91251A1601.75" (1-3/4")
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91251A1622.00"
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SPECS
Material alloy steel
Finish black-oxide
Head Style socket
Thread Size 4-40
Drive Style 3/32” Hex Key

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