L9® Fastening System

1. Thicker than standard bolt head adds wrenching surface.
2. Washer face eliminates corner drag.
3. Radius under bolt head adds strength.
4. Countersunk washer I.D. centers the washer against the bolt head bearing surface during tightening.
5. UNR radiused root bolt thread increases fatigue resistance by reducing the notch effect of conventional UN threads. The UNR thread radius is maintained into the thread runout at the junction of thread to shank.
6. Smooth washer bearing surfaces distribute loads uniformly and reduce brinneling. Plated finish assists torquing.
7. Chamfers eliminate corner drag.
8. Thicker than standard nut side walls facilitate wrenching. Heat treating helps prevent splitting and stripping.
9. Collared L9 prevailing torque metal locknut for assemblies subject to vibration.

Available in assortments: (USS)  &  (SAE)