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What Size Bolts Will The Thule SquareBar Adapters TH8897 Work With?  

Updated 02/17/2026 | Published 06/17/2024

Question:

What is the bolt size and necessary washers/nuts for these adapters?

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Expert Reply:

Hello Geoff. The Thule SquareBar Adapters # TH8897 will work with an M6 bolt.

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Jesse M
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Jesse M.

2/17/2026

Hey Geoff, did the M6 bolts work out with your Thule SquareBar adapters? Knowing how that fit came together could help others setting up the same system.

Geoff M. profile picture

Geoff M.

2/17/2026

@JesseM the bolts worked but the square bar adapters were too lose on my bars because what I was mounting them to (solar panel) didn’t have a mechanism to create opposing force to lock the adapters in place. Ended up using these Yakima adapters because they work for round or square bars. Y04093
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Etrailer Expert

Jesse M.

2/17/2026

@GeoffM I gotcha. Sorry to hear they didn't work out for your panels, but I'm glad to hear you found a solution with the RoundBar adapter kit. Thanks for taking the time to share!

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