The Castair Replacement Axle Bolt for 8-Gallon Portable (AB12) is the OEM replacement wheel axle bolt for Cast Air 8-gallon portable compressor tanks. At $3.85, this is exactly what it sounds like: the bolt that holds the wheels on a portable tank. When it strips, shears, or goes missing, you need the correct 1/2" size -- not a hardware store substitute that may be the wrong grade, wrong thread pitch, or wrong length.
Portable compressor tanks live a hard life in a shop. They get rolled over concrete, dragged around bays, knocked into jack stands, and used as footstools by techs who should know better. The axle bolt takes real lateral load every time you roll the tank across an uneven floor. Having the correct OEM replacement on the shelf means the tank stays mobile when the hardware eventually fails.
Key Features
- OEM Cast Air part: Exact fit for 8-gallon portable compressor tank wheel axles -- no guessing, no modification required
- Correct 1/2" diameter: The right size for the AB12 application; do not substitute with hardware store bolts of unknown grade
- Direct replacement: Installs exactly as the factory original -- correct length, correct thread, correct head
- Inexpensive insurance: At $3.85, keeping a spare on the shelf costs almost nothing and prevents a grounded tank
- Minnesota-made quality: Cast Air manufactures in Minnesota with a focus on durability and correct specifications across their full product line
Which Bolt Does Your Tank Take?
Cast Air uses two axle bolt sizes across the portable tank lineup. Order by tank size, not by guessing:
- AB12 -- 1/2", $3.85: For Cast Air 8-gallon portable air receiver tanks
- AB34 -- 3/4", $5.39: For Cast Air 20-gallon portable air receiver tanks
If you have both sizes of portable tanks in your shop, keep one of each on the shelf. Combined cost is $9.24. There is no reason to ever have a tank grounded over a missing axle bolt.
When Does a Shop Need This
Order this bolt when:
- The existing axle bolt is stripped, sheared, or missing and the tank cannot roll
- You are doing a full service on a portable tank and want to replace worn hardware
- You are stocking a spare parts shelf for Cast Air portable equipment
- A technician has already used an incorrect substitute bolt and you need the proper OEM part
Do not order this bolt for 20-gallon portable tanks -- those take the AB34 (3/4"). The wrong bolt size will not seat correctly in the axle bracket.
Technical Specifications
- Part Number: AB12
- Manufacturer: Cast Air (Castair), Minnesota
- Bolt Diameter: 1/2"
- Application: Cast Air 8-gallon portable air receiver tank wheel axle
- Price: $3.85
- Category: Tank Accessories / Replacement Hardware
- Related Part: AB34 (3/4" for 20-gallon portable tanks)
What Is Included
- One (1) AB12 replacement axle bolt, 1/2" diameter
Why Buy From Air Compressor Factory Direct
We stock Cast Air replacement hardware alongside the full Cast Air compressor and tank lineup because shops need the correct OEM part when something breaks -- not a close substitute that may not fit or hold. Since 2016, we have supplied professional shops with the right components for their compressed air systems. We carry the full Cast Air accessory catalog, including tank hardware, manifolds, and controls, so you can source everything from one place.
Free shipping on qualifying orders. Full manufacturer warranty on Cast Air parts. Call us before ordering if you are not sure which bolt your tank takes -- we will confirm compatibility before anything ships.
Call 866-217-0063 for quick answers and help!
