Any Bolt, Any Size, Any Configuration
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Sta-lok Spiral Positive Lock

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              APPLICATIONS
  FEATURES AND BENEFITS    
  • 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.

    SHAFT BOLT SERRATIONS 
Broaching serrations of shaft/bolt is required. For installation and removal of locknuts and lockwashers contact Shur-Lok for technical sales bulletin TSB0001.