Keep your bolts from coming loose with Permatex Medium Strength Threadlocker (blue). Avoids use of lock nut on any nut and bolt between 1/4- and 3/4-inch, while also protecting threads from corrosion. Protective hold still leaves bolts removable with hand tools. Conforms to ASTM D 5363 AN0321 (Mil-S-46163A, Type II, Grade N)