Bolt Diameters
U-bolt kits indexed by bolt diameter and duty rating.
3/8" (light duty)
Light-duty 3/8" U-bolts for small utility trailers.
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1/2" (standard)
Standard 1/2" U-bolts — the most common suspension fastener.
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9/16" (heavy duty)
Heavy-duty 9/16" U-bolts for 5,200–8,000 lb axles.
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5/8" (extra heavy duty)
Extra heavy-duty 5/8" U-bolts for 10,000 lb+ applications.
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