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Packaged Items
SinglePack of 5
TypePart No.Thread SizeCotter Pin Size
Cad PlatedAN310-81/2-20


Fabricated from steel and cadmium plated per QQ-P-416A, Type II, Class 3. AN310 castle nuts are used with drilled-shank bolts, clevis bolts, eye bolts and studs. The slots in the nut accommodate a cotter pin for safety purposes. The thinner AN320 castellated shear nut, with half the tensile rating of the AN310 nut, is used with clevis bolts and threaded taper pins which are subject to shearing stress only.

Less 20% for quantity 100/Part No.
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WARNING: Cancer and Reproductive Harm -

Reference Chart


As advertisede

John B Verified Purchase


April 23, 2023

Marian J Verified Purchase


October 18, 2022

Its a size AN8 castle nut it will go on the end of the bolt that hold the engine on the mounts its big.

Sara B Verified Purchase


January 11, 2022

I am building a small scale radial engine. About 8 horsepower. These will be the prop nuts. They look fantastic. Mike Brainerd

Mike B
March 8, 2021

As usual, very fast shipping and well packed, a company I can always rely on.

Malcolm C
March 8, 2020


Sport I
November 15, 2019

you are doing great getting everything here at reasonable rates and on time . USPS Priority does great Thanks

Bob B
November 7, 2019

This part is a MUST for proper tailwheel operation.

Robert M
August 12, 2019

July 12, 2019

Nice quality part. Better built than the original one I had!

Courd B
June 22, 2019


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Are these castle nuts unified national fine thread?

Yes, they are standard AN UNF thread.

Q: Does part 06-01291 attach to the spring with one our two holes?

Part # 06-01291 is the two hole version.

Q: What is the tire and tube for Scott 3200 tailwheel?

The Scott 3200 tailwheel uses a 280x250x4 tire, found under our part # 06-01244. The tube can be found under our part # 06-00760.

Q: How much does the 8" bushwheel weigh?

3400 weighs 11lbs and 3400B weighs 13lbs.

Q: Do Scott 3200 tailwheel parts interchange with Alaska Bushwheel parts?

They will fit and will work just fine but the mechanic would have to use their discretion. We cannot confirm the PMA approvals are interchangeable.

Q: What is the difference in the length of the standard axle bolt versus the wide axle bolt?

We believe you are asking about the BI-872 bolt which is for the ABI-3400-b tailwheel. This bolt is longer because the ABI-3400-b has a wider fork because it is used with the baby bushwheel tire/wheel combo.

Q: What is included in this assembly for the price?

06-01151 is the tailwheel head with the head bolt, grease zerk, and bearing race installed.

Q: Do the 3200 wheel halves 06-00745 come with the bolts that hold them together?

No the bolts would be separate.

Q: What are the hex sizes and height for the AN310-6 and 310-8 castle nuts?

AN310-6 would use a 9/16 wrench and is 13/32 tall

An310-8 would use a 3/4 wrench and is 9/16 tall.

Q: What is included on 06-01148?

This is a complete tailwheel assembly 10", this replaces the scot 3400. The tailwheel does not include springs.

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