GMNA GM6124M PDF

This specification establishes performance requirements and the procedures to determine the locking ability of preapplied adhesive coatings on threaded bolts, nuts, screws, studs, etc. This specification is written for the purpose of identifying and controlling key material properties of adhesive coated threaded fasteners.

Material Description. The materials approved to this specification provide moderate thread locking ability up to 135°C.

Typical Application. Externally threaded fasteners that require a preapplied adhesive for chemical locking to prevent self loosening due to shock and vibration. Fasteners with this material shall not be reused.

Two other GM preapplied thread locking specifications, GM6175M and GM6194M, are available for fasteners that require higher thread locking and/or temperature performance.

Remarks.

The preapplied thread locking adhesive compounds are dry to the touch and remain inert on externally threaded fasteners until they are engaged into the mating internal thread. The shearing action, or forces of assembly, activate the adhesive, which, after proper curing time and temperature, harden to form a chemical bond between the mating thread. This chemical adhesive bond prevents fastener loosening from shock and vibration. The adhesive shall be dry to the touch when properly applied and be compatible with automatic feed equipment used in the installation of fasteners. The applied compound shall have no adverse effect on the health of personnel when used for its intended purpose.