GB/T 839-1988
ActiveKnurled thumb screws with waisted shank
滚花头不脱出螺钉
Application Summary AI generated
GB/T 839-1988 specifies the dimensions, materials, and technical requirements for knurled thumb screws with a waisted shank, designed for manual tightening without tools. These screws are primarily used in mechanical assemblies where frequent adjustment or disassembly is needed, such as in instrument panels, electronic enclosures, or clamping fixtures. The standard ensures interchangeability and reliable retention in applications requiring a non-slip grip and captive screw functionality.
Related Standards
GB/T 62.1-2004
Wing nuts--Round wing
GB/T 9074.20-2004
Cross recessed hexagon head tapping screw with indentation and washer assemblies with plain washers
GB/T 62.3-2004
Wing nuts--Pressing wing
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 3098.20-2004
Mechanical properties of fasteners--Wing nuts with specified proof torque
GB/T 62.4-2004
Wing nuts--Die-casting wing
GB/T 3098.19-2004
Mechanical properties of fasteners--Blind rivets with break pull mandrel
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.