5/16-18 12 Point Flange Bolts

5/16-18 12 Point Flange Bolts

5/16-18 12 point flange bolts, USS coarse thread, 170,000 psi high tensile alloy steel with a thermal black and oil finish, in 1/2", 3/4", 7/8", 1", 1-1/4", 1-1/2", 2" lengths.

Specifications

• Size: 5/16-18 (USS coarse)
• Lengths: 1/2", 3/4", 7/8", 1", 1-1/4", 1-1/2", 2"
• Head: 12 point with flange
• Material: high tensile alloy steel, 170,000 psi min. tensile
• Finish: thermal black with oil

Common Uses

• Engines and performance builds
• Machinery
• Tight spaces and counterbores

FAQ

Why a 12 point head?
A 12 point head is smaller than a hex head for the same bolt, so it fits tight spaces and counterbores, and the 12 points let a wrench grip from more angles. Use a 12 point socket.

How tight should I torque these bolts?
Torque depends on grade, size, thread and lubrication. Use the Bolt Tightening Torque Chart (PDF) on this page as a starting point.

Related: All 12 Point Coarse | 12 Point Fine Thread | Grade 8 Hex Nuts

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