• 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 elminates keyways allowing reduction of shaft wall thickness or diameter.
• Keyway stress concentrations are eliminated.
• Internal serrations of washer mates with serrated shaft.
• SL60 series nut and washer supplied as separate components under NAS 1493 and NAS 1443 part numbers.
• SL61 series washer incorporates an additional removal feature.
  
  

• Interference type - where there is high RPM and/or load reversals.
• Where achieving precise preload is critical and existing nuts cannot provide adequate adjustment.
• Where vibration is present.
• 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
.391 through 4.325 inch.

Metric sizes available on request.