Cylinder block and rocker arm studs, shock absorber mounts and ring gear bolts. Permatex® Threadlockers fixture in approximately 20 minutes and are fully cured within 24 hours. Permatex® Surface Prep™ activator reduces fixture time to 5 minutes. Preceding values are for 3/8"-16 steel "as received" nuts and bolts at 72degF (22degC). For Use in Heavy Duty Applications Locks Studs, Bushing & Fasteners Against Vibration Loosening Ideal for 3/8" to 1" Fasteners (10 to 25 mm) Heat and Special Tools Needed for Disassembly Thread Compounds