Specification for Stiffnuts (Unified threads) for aircraft Ingestion-build-141043 risk treatment

risk treatment

Other values are acceptable but should be verified

and surface finishes that do not foul easily or which can be cleaned easily

EN 50174-1

Specification for Stiffnuts (Unified threads) for aircraft Ingestion-build-141043 risk treatment1 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,