Type A - without thread coating
Type PRB - with thread coating (polyamide all round coating)
GN252 Blanking Plug, Steel, Optional Thread Coating
Threaded plugs can be used as a spring retention unit as shown above or as a plug to keep debris from entering into a critical threaded area.
The thread locking PRB (polyamide all round coating) acts as a clamping lock which prevents the locking screw from being inadvertently being loosened and becoming detached.
Also available in stainless steel, GN252.5
Steel, Tensile strength 500 N/mm2, blackened.