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Socket Head Cap (Allen) Screw UNC 4-40 x 5/16 inch in A2 Stainless - ASME B18.3/ASTM F837(CW)

Also known as an Allen screw or Allen bolt, or simply a cap screw, socket head cap screws are a more modern alternative standard machine fastener to the standard hexagon headed bolt or setscrew, as found on much modern machinery. A hex key (otherwise known as an Allen key) is required to fit these fasteners. Conforming to ASME/ANSI B18. 3, the contact surfaces of this screw or bolt are protected from external damage. Generally manufactured with a partial thread beyond a certain length and nominal diameter combination, but occasionally some stock may include a fully threaded shank at the same combination.
Image of UNC Socket Head Cap Screws ASME B18.3-2012 in A2 image
technical drawing of UNC Socket Head Cap Screws ASME B18.3-2012
Technical Summary
d nominal diameter 4-40
tpi threads per inch 40
dk head diameter 0.183
k head height 0.112
t recess depth 0.051
s drive size 3/32
b minimum thread length 0.75-0.99
Standard ASME B18.3/ASTM F837(CW)
Material A2 Stainless Steel
all dimensions in inches
datasheet
Description Sale Qtys Qty Price Breakdown Despatch Estimate
Socket Head Cap (Allen) Screw UNC 4-40 x 5/16 inch in A2 Stainless
(WF17353)
£4.68
Socket Head Cap (Allen) Screw UNC 4-40 x 5/16 inch in A2 Stainless   (WF17353)
£4.68
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technical drawing of UNC Socket Head Cap Screws ASME B18.3-2012
Technical Summary
d nominal diameter 4-40
tpi threads per inch 40
dk head diameter 0.183
k head height 0.112
t recess depth 0.051
s drive size 3/32
b minimum thread length 0.75-0.99
Standard ASME B18.3/ASTM F837(CW)
Material A2 Stainless Steel
all dimensions in inches
datasheet