What Wheel Stud do I Need, Mine Has "21 B23" Stamped on it?
Updated 09/02/2025 | Published 06/19/2025
Question:
im looking for wheel studs for a trailer axle and i cant seem to find the correct ones the studs have 21 B23 stamped on the top of them
asked by: Weston
Expert Reply:
Hello Weston,
I am not sure what the 21 is for, but the B23 likely refers to the ASTM A540 Grade B23 specification, which is a high-tensile alloy steel used for special applications like nuclear power plants. This suggests the stud is a bolt or threaded rod made from this specific material.
You will need to measure the stud to see what size you need. For example, if yours measure 9/16" and is 2-5/16" long then you will need the Drive-in Wheel Bolt for Trailer Wheel Hubs - 9/16" Diameter x 2-5/16" Long - Qty 1 # 7-132.
I attached an image of where they measure, if you could send me those measurements I am happy to find the correct one for you.
(click to enlarge)
Product Page this Question was Asked From
Drive-in Wheel Bolt for Trailer Wheel Hubs - 9/16" Diameter x 2-5/16" Long - Qty 1
- Accessories and Parts
- Boat Trailer Wheels
- Trailer Hubs and Drums
- Trailer Tires and Wheels
- Wheel Studs
- Drive-In Stud
- Redline
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Kate F.
9/2/2025
Hey Weston, Did you have a chance to measure the wheel studs on your trailer axle? If you send me those measurements, I can help you find the correct ones. I'm following up to make sure we get you the right fit.