Standard size of lock nut

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Lock nuts have a series of standard sizes and terms
1 Scope This standard specifies the dimensions, technical requirements, acceptance rules and measurement methods of lock nuts (nuts for short) and locking devices. This standard applies to the design, production, inspection and user acceptance of nuts and locking devices for tapered bushings.
2 Reference standards The provisions contained in the following standards constitute provisions of this standard through quotation in this standard. At the time of publication, the editions indicated were valid. All standards will be revised, and all parties using this standard should explore the possibility of using the latest version of the following standards. GB/T 192-1981 Basic profile of ordinary thread GB/T 196-1981 Basic size of ordinary thread (diameter 1~600 mm) GB/T 272-1993 Rolling bearing code method GB/T 699-1988 Technical conditions for high-quality carbon structural steel GB/T 1804-1992 General tolerance linear dimension unmarked tolerance GB/T 2516-1981 General thread deviation table (diameter 1~355 mm) GB/T 5796.1-1986 Trapezoidal thread profile GB/T 5796.3-1986 Trapezoidal thread basic Dimensions GB/T 5796.4-1986 Trapezoidal thread tolerance GB/T 6930-1986 Rolling bearing vocabulary GB/T 8597-1988 Rolling bearing packaging JB/T 3574-1997 Rolling bearing product mark JB/T 8921-1999 Rolling bearing and its product parts inspection rules.
3 Terminology The terminology used in this standard conforms to the provisions of GB/T 6930.
This standard specifies the marking system, indicators, test methods and signs for the mechanical and working performance of the effective moment steel hexagonal lock nuts. This standard is applicable to coarse-tooth 6H nuts with a thread diameter of 3~39mm, which are made of carbon steel or alloy steel, whose opposite side width meets the requirements of GB 3104, the nominal height is ≥0.8D, and the guaranteed load and effective torque are required. Except for the effective torque part, the thread size and tolerance shall be in accordance with GB 193, GB 196 and GB 197. The working temperature range of the nut should conform to: All metal nuts without electroplating treatment: -50°C~+300°C. All metal nuts with electroplating treatment: -50°C~+230°C Nuts embedded in non-metallic components: -50 ℃~+120℃ This standard does not apply to nuts with special performance requirements (such as welding performance and corrosion resistance). For stainless steel and non-ferrous metals made of carbon steel or alloy steel with fine pitch lock nuts or thin nuts, the effective torque performance indicators and test methods specified in this standard may be adopted by mutual agreement.

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