High quality industrial grade stainless steel thin pattern nylon insert locking nuts Standard Type 18-8 Stainless Steel Refer to pictures for complete dimensions These stainless locking nuts are rust and corrosion resistant. They are about half as thick as a standard locking nut so they can be used in tight spot applications. The nylon insert grips the threads to lock in place. They can be removed if needed. Max temperature should not exceed 220 Degrees F.