• Positive mechanical lock that is not dependent on lubricants or plating for repeatability.
• Achieves precise preload - serrations provide adjustment that eliminates back-off or over-torque.
• Maintains fatique strength at reduced weight. External serrations in the nonload carrying portion of the thread. Eliminates keyways allowing reduction of shaft wall thickness or diameter.
• Keyway stress concentrations are eliminated.
• Internal serrations of washer mates with serrated shaft.
• Designed with either inference fit or clearance fit.
• External lugs of serrated washer engages slots of nut.
• Spiral retaining ring feeds into internal groove of nut to provide positive retention of washer.
• Nut, washer, and spiral retaining ring supplied as separate components.
• Can be designed in various wrenching configurations.
  
  

• Inference type where there is high RPM and/or load reversals.
• Where achieving precise preload is critical and existting nuts cannot provide adequate adjustment.
• Where weight reduction is a priority and shaft wall thickness or diameter can be reduced.
• Where a positive mechanical lock is required.
  
  

SERRATIONS - INTERFERENCE FIT
Inference fit is provided by Shur-lok design.

THREAD SIZE
.500 inch and larger.

Metric sizes available on request.