Available in metric sizes, GN 252.5 Stainless Steel Threaded Plugs can be used as spring retention units or as plugs to keep debris from entering into critical threaded areas. PRB thread coating acts as clamping lock, preventing locking screw from inadvertently being loosened and becoming detached. Offered with thread sizes ranging from M12 to M27, RoHS-compliant plugs are made of stainless steel, European Standard No. 1.4305 (American Standard Series 303).