GB/T 31.3-1988
AbolishedHexagon bolts with split pin hole on shank--Fine pitch thread--Product grade A and B
六角头螺杆带孔螺栓 细牙 A和B级
Application Summary AI generated
This standard specifies the dimensions, technical requirements, and marking of hexagon bolts with a split pin hole on the shank and fine pitch threads, available in product grades A and B. It is applied in mechanical assemblies requiring vibration-resistant locking, such as automotive, aerospace, and heavy machinery connections, where a split pin is inserted through the hole to prevent loosening. The standard ensures interchangeability and reliability in high-precision or high-stress bolted joints.
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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.