RS PRO Plain Stainless Steel Locknut M8, Nylon Insert, DIN 985, 13mm Width, 8mm Height 521-951

The RS PRO 521-951 is a plain stainless steel locknut designed for M8 fasteners, featuring a secure glass-filled nylon insert for high vibration resistance. This locknut is suitable for a wide range of demanding applications due to its robust A2 stainless steel construction, ensuring both durability and strong environmental resistance. The plain finish and adherence to the DIN 985 standard guarantee quality and reliability for professional use.

Measuring 13 mm in width and 8 mm in overall height, this locknut provides the expected fitment for M8 threads and is engineered to remain secure under dynamic load conditions and severe vibration. The included nylon insert deforms against the thread, eliminating the need for additional lock adhesives and maintaining fastening integrity over time.

Applications for this locknut include industrial machinery, automotive assemblies, and domestic appliances such as washers and dryers. Its secure locking properties also make it ideal for joining soft materials like wood or plastic, as well as clamp loads that may otherwise be vulnerable to loosening.

Due to the deformation of the nylon insert during each use, it is not advisable to reuse these locknuts as this may compromise their performance in vibration damping and stress reduction. Finger tightening is recommended initially, followed by tool tightening to reach the required torque.

The RS PRO locknut is manufactured in China and meets the requirements of DIN 985 for self-locking nuts, ensuring consistent performance and easy integration into systems requiring reliable fasteners.

Heavy-duty nylon insert locknut for secure fastening in vibration-prone environments. Constructed from A2 stainless steel with a plain zinc finish for durability and corrosion resistance. DIN 985 compliant to guarantee quality and compatibility.

Ideally suited for industrial, automotive, and domestic appliance use cases. Nylon insert prevents thread loosening, reducing the need for adhesives or secondary locking systems. Explore more fasteners and industrial solutions within the RS PRO family and browse leading Locknut standards in the EnvMart Industrial Fasteners category.