Product Description
Toyota OEM lockwasher, part number TO 00591-72575-81, is designed for secure retention of fasteners in electric lift trucks. Constructed of high carbon steel with typical hardness Rockwell C38–C45, this washer prevents fastener loosening from vibration and torque. Dimensions conform to standard Toyota lock washer sizing. No cross-reference part numbers available.
Specifications
Material & Construction
| Material Specification | High carbon steel construction |
| Steel Grade | Meets SAE J995 Grade 5 or equivalent |
| Typical Hardness | Rockwell C38-C45 |
Part Numbers
| OEM Part Number | TO 00591-72575-81 |
| Manufacturer Part Number | 00591-72575-81 |
Frequently Asked Questions
Q: What material and hardness specification does the TO 00591-72575-81 lockwasher have?
A: This Toyota OEM lockwasher is constructed of high carbon steel with a hardness range of Rockwell C38 to C45, meeting SAE J995 Grade 5 or equivalent specification. This hardness prevents deformation under bolt tension.
Q: Which fasteners and assemblies use this lockwasher in Toyota electric lift trucks?
A: The TO 00591-72575-81 is used with critical fasteners throughout Toyota electric lift truck assemblies, particularly where vibration and torque cycling occur. Refer to your equipment service documentation to identify specific fastener locations requiring this lockwasher.
Q: Why is material and hardness specification important for this lockwasher?
A: The high carbon steel construction at Rockwell C38-C45 hardness creates the spring tension needed to resist vibration loosening and torque relaxation in electric lift truck environments. Using OEM spec lockwashers prevents fastener failure and maintains structural integrity of the lift truck.
Q: Are there cross-reference part numbers for the TO 00591-72575-81?
A: No cross-reference part numbers are available for this Toyota OEM lockwasher. Use only the part number TO 00591-72575-81 to ensure correct material and hardness specifications for your equipment.