Standard size of the lock nut


1) Scope This standard specifies the size, technical requirements, acceptance rules and measurement methods of locking nuts (referred to as nuts) and locking devices. This standard is applicable to the design, production, inspection and user acceptance of nuts and locking devices for cone bushings.
2) Terminology The terms used in this standard comply with the provisions of GB/T 6930.
This standard specifies the marking system, index, test method and mark of the mechanical and working performance of the effective torque steel hexagonal lock nut. This standard is applicable to coarse teeth 6H class nuts made of carbon steel or alloy steel, opposite side width in accordance with GB 3104, nominal height ≥0.8D, need to ensure the load and effective moment, thread diameter of 3 ~ 39mm. Except for the effective torque part, the thread size and tolerance are specified in accordance with GB 193, GB 196 and GB 197. The operating temperature range of the nut should meet the following requirements: All-metal nuts without electroplating treatment: -50 ° C to +300 ° C.
Electroplated all-metal nuts: -50℃ ~ +230℃; Nuts embedded with non-metal components: -50℃ ~ +120℃. This standard does not apply to nuts with special performance requirements (such as weldability and corrosion resistance). For fine tooth lock nuts or thin nuts made of carbon steel or alloy steel of stainless steel and non-ferrous metals, the performance indexes and test methods of effective torque specified in this standard may be adopted by mutual agreement.

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