Grade 8 Hex Flange Frame Bolts (USS) Coarse Thread
Grade 8 hex flange (frame) bolts in USS coarse thread, from 1/4-20 to 3/4-10 and 1/2" to 6" long, with a black phosphate and oil finish. The flange spreads the load over a wide area, which is why they are used on truck and trailer frames. Choose a size below.
Specifications
- Grade: Grade 8
- Head: hex with flange
- Thread: USS coarse, full (FT) and partial (PT) thread
- Sizes: 1/4-20, 5/16-18, 3/8-16, 7/16-14, 1/2-13, 5/8-11, 3/4-10
- Finish: black phosphate and oil
Common Uses
- Truck and trailer frames
- Suspension and crossmember work
- Heavy equipment
FAQ
Do flange bolts need a washer?
No. The built-in flange spreads the load like a washer, so one part does the job of two and speeds up assembly.
Why black phosphate?
Black phosphate and oil is a light corrosion protection that holds paint well. It is meant for frames and parts that get painted or undercoated, not for bare outdoor exposure.
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: Grade 8 Flange Bolts Fine Thread | Grade 8 G Flange Lock Nuts | Serrated Flange Lock Nuts | 12 Point Flange Bolts
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