Specification for Stiffnuts (Unified threads) for aircraft Ingestion-build-141043 describes the relationship between safety

describes the relationship between safety functions

That housing (outside the insulating core) is made of polymeric material and end fittings permanently attached to the insulating core

risk treatment

second and third-party laboratories

EN 50174-1

Specification for Stiffnuts (Unified threads) for aircraft Ingestion-build-141043 describes the relationship between safety1 Scope 1. 1 These British Standards cover the dimensions, material, finish, testing and identification of aircraft stiffnuts with Unified threads. According to the materials used in their construction, the stiffnuts are classified as satisfactory for use at sustained temperatures within the following ranges: a) 75 C to + 425 C: corrosion resisting steel nuts, silver plated or unplated b) 75 C to + 200 C: steel and corrosion resisting steel nuts,