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Item # Description Pkg Qty Price Weight
Per Pkg
917254-8 HHCS,5/16-18x3-1/4,Steel,GR 5, 1
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0.08 lb
HHCS,5/16-18x3-1/4,Steel,GR 5,

5/16"-18, Steel Hex Head Cap Screw, Grade 5, 3-1/4"L, Zinc Plated Finish, 50 PK

These hex head screws each feature a thick, hexagonal head designed for tightening with a wrench. Use in pretapped holes or with nuts. Grade 5 steel construction offers strength and moderate flexibility. The screws are hardened, yet more malleable than Grade 8, allowing them to withstand shear force.

Basic Material Carbon Steel
Diameter 5/16 in.
Fastener Industry Standards ASME B18.2.1
Fastener Strength Grade/Class 5
Finish Zinc Plated
Head Height 13/64 in.
Head Type Hex Head
Head Width 1/2 in.
Industry Designation HHCS
Item Hex Head Cap Screw
Length Under Head 3-1/4 in.
Material Carbon Steel
Material Grade Grade 5
Meets/Exceeds SAE J429, ASME B18.2.1
Min. Thread Length 7/8 in.
Rockwell Hardness C25 to C34
Screw Grade Grade 5
System of Measurement Fractional
Tensile Strength 120,000 psi
Thread Direction Right
Thread Length 1-1/4 in.
Thread Size 5/16"-18
Thread Style Partially Threaded
Thread Type Coarse
Type Medium Strength
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Grainger Dropship Grainger Dropship 46F542
VMRS (ATA) CODES VMRS (ATA) CODES 053-007-005 HHCS,5/16- 18x3-1/4,
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