What grade are Redline replacement U-bolts for 2" wide square axles?

Updated 04/30/2026 | Published 04/27/2026

Products Featured in This Question

Replacement U-Bolt for 2" Wide, Square Axles - 7/16" Diameter - Zinc Plated

(238)

$7.56

Question:

I am wondering what grade these u-bolts are manufactured to. Are they comparable to a grade 8 bolt, or closer to grade 5? Thank you.

asked by: Benjamin B

Expert Reply:

Thanks for asking Benjamin, I'm sure someone else is wondering the same thing.

Redline replacement U-bolts # UBZC716X212X400 are made to a Grade 5 strength level, which is usually a standard for trailer suspension. They’re designed to clamp and flex slightly under load, something a harder Grade 8 bolt isn’t meant to do.

Are you replacing existing U-bolts or installing new ones?

expert reply by: James D