GMNA GM1131M PDF

This specification covers the more common types of sealing materials used in conjunction with fasteners (screws, nuts, and attaching clips), which are assembled into attachment holes in sheet metal. Holes intended to receive fasteners are generally designed with considerable clearance necessitating the use of a sealing material to fill the balance of the hole remaining after insertion of the fastener. Sealing materials for this service are required to prevent the penetration through the hole cavity of road splash, dust, etc.; also, to afford protection from corrosion where paint may have been chipped fro the edges of the hole during assembly.

Dependant on the end use, composition, and application, the seals may be cut, molded, cast, or extruded. Normally these seals are specified as a preshaped, ready for use part and often assembled to the part for which they are designed.

This specification is intended to cover only basic requirements. More detailed requirements for individual applications shall be specified in engineering drawings, purchase order and/or in other agreements between supplier and purchaser.