Permatex . Red. OEM specified as 271 . High-strength threadlocker for heavy-duty applications. Especially well-suited for permanently locking studs and press fits. Add 3000 P.S.I. holding power on slip and press fit assemblies. Replaces set screws and snap rings. Locks against vibration loosening. Requires extra effort or special tools for removal. For fasteners sized 3/8″ to 1″ (9.5-25mm). Temperature range: -65 deg. F. to 300 deg. F. Suggested applications : Cylinder block and rocker arm studs, ring gear bolts, frame bolts, shock absorber bolts. Carded.