Size of Replacement Rectangular Washer for Thule Ride-On Adapter
Updated 02/03/2026 | Published 07/02/2024
Question:
What is the outside diameter of the part? …and the inside diameter of the small square hole? I’m doing a diy project on a car detailer skid and might be able to use this part to enlarge the square on my carriage bolts from 1/4th to 1/2”. I need to keep my bolt shaft diameter at 1/4th while enlarging the square at the head to 1/2” to go into the strut channel holes which are 1/2” as in the picture Thanks!
asked by: Roger W
(click to enlarge)
Expert Reply:
Hello Roger,
The Replacement Rectangular Washer for Thule Ride-On Adapter # 853-2154 measures 1" long x 5/8" tall and the hole in the middle is 1/4" square.
(click to enlarge)
Product Page this Question was Asked From
Replacement Rectangular Washer for Thule Ride-On Adapter
- Accessories and Parts
- Roof Rack
- Hardware
- Washers
- Thule
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Chris R.
2/3/2026
Hey Roger, did the rectangular washer with the 1/4-inch square hole end up working for your car detailer skid project? Your results could really help others trying to match hardware to strut channel holes.