Product Description
The BJ 059438 is a hex axle nut engineered for caster wheel applications on Big Joe electric lift trucks. This Grade 5 steel fastener secures the wheel to the axle shaft, maintaining proper wheel rotation and load support. Manufactured to factory specifications for direct replacement on compatible Big Joe lift truck models.
Specifications
Fastener Specifications
| Thread Size | 1/2-20 UNF |
| Wheel Size | caster wheel |
| Fastener Type | Hex axle nut |
Material & Construction
| Material Specification | Minimum SAE J995 Grade 5 steel |
| Steel Grade | SAE Grade 5 |
| Hardness | Rockwell C21–C32 |
Part Numbers
| Manufacturer Part Number | BJ 059438 |
| Part Number | 059438 |
Compatibility
| Equipment Compatibility | Big Joe series 21A, 21P, and 21R electric lift trucks |
Frequently Asked Questions
Q: What is the 059438 and which caster wheel size does it fit?
A: The 059438 is a 1/2-20 UNF hex axle nut engineered for caster wheel applications on Big Joe electric lift trucks. It secures the wheel to the axle shaft and maintains proper wheel rotation and load support.
Q: Which Big Joe lift truck models are compatible with the 059438?
A: The 059438 is designed for Big Joe series 21A, 21P, and 21R electric lift trucks equipped with caster wheels. Confirm your equipment falls within these model series before ordering. Do not use this nut on other series or wheel sizes.
Q: What is the material specification and grade of the 059438?
A: The 059438 is manufactured from minimum SAE J995 Grade 5 steel with a hardness range of Rockwell C21-C32. SAE Grade 5 steel provides superior strength and corrosion resistance compared to lower grades, ensuring reliability under heavy lift loads.
Q: How do I verify the 059438 is the correct part for my Big Joe lift truck?
A: Confirm your equipment is a Big Joe series 21A, 21P, or 21R model and that your caster wheels are in diameter. The existing axle nut should have a 1/2-20 UNF thread specification. If all three criteria match, 059438 is the correct replacement.
Q: What maintenance or inspection is required for the 059438?
A: Inspect the axle nut during routine fleet maintenance to ensure it remains tight and secure. A loose or missing nut is a safety hazard that prevents proper wheel function. Replace immediately if the nut is stripped, cracked, corroded, or cannot maintain torque.
Q: Can this axle nut be reused during maintenance?
A: Hex axle nuts can typically be reused if they remain undamaged and can hold proper torque specification. However, best practice in fleet maintenance is to replace the nut if it has been removed more than a few times, as repeated removal can reduce holding capacity. Always inspect for corrosion, stripping, or deformation before reuse.
