Replacement Seals and Castle Nut for Boat Trailer

Updated 05/11/2026 | Published 05/09/2026

Products Featured in This Question

Double Lip Grease Seals (pair)

(665)

$6.95

Spindle Nut for Axles with 7/8" - 14 Castle Nut

(56)

$7.94

Question:

I want to replace the seals, castle nuts and spindle washers on my boat trailer. The seal measures 1.25 id and 1.98 od and is 1/4 thick and is 5/16 wide. The 6-slotted castle nut has a threaded id of 3/4 and is 1 1/8 inches wide and is 5/8 high. the spindle washer is 13/16 id and 1 1/2 od. Can you help? Thanks

asked by: Tim

Expert Reply:

Hey TIm! The seal we definitely have. You can use the # RG06-010 which is a pair of seals. The closest thing we have on the castle nut is the Spindle Nut for Axles with 7/8" - 14 # 165931. Nothing is 3/4" so I would double check that measurement. The spindle washers we only carry with a 1" ID so they would have to be acquired elsewhere.

What boat trailer are you working on?

expert reply by: Robin H