GB/T 39-1988
ActiveSquare nuts--Product grade C
方螺母 C级
Application Summary AI generated
GB/T 39-1988 specifies the dimensions, tolerances, and technical requirements for square nuts classified as product grade C, which have larger tolerances than higher grades. It is applied in mechanical assemblies where quick fastening or loosening is needed, such as in construction equipment, agricultural machinery, or temporary fixtures, where precision is less critical. The standard ensures interchangeability and compatibility with corresponding bolts and screws in low-stress, non-critical applications.
Related Standards
GB/T 9074.5-2004
Cross recessed small pan head screw andwasher assemblies with plain washers
GB/T 62.2-2004
Wing nuts--Square wing
GB/T 62.1-2004
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GB/T 62.3-2004
Wing nuts--Pressing wing
GB/T 9074.20-2004
Cross recessed hexagon head tapping screw with indentation and washer assemblies with plain washers
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Wing nuts--Die-casting wing
GB/T 3098.19-2004
Mechanical properties of fasteners--Blind rivets with break pull mandrel
GB/T 3098.20-2004
Mechanical properties of fasteners--Wing nuts with specified proof torque
Transparency note: The application summary and key sentences on this page were automatically generated by AI from the standard's original text. This content has not been human-verified and should not be used for compliance or regulatory purposes. Always refer to the official standard document from the issuing authority.