Nordlock Washer Securing System M8

£0.49

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Fastener - Washer - Nord-lock Washer Bolt Securing System - M8

Special halved and toothed 8mm ( 5/16" ) Zinc Washer.

Sold individually

Inner ?ò 8.5mm
Outer ?ò 13.5mm
Thickness 2.5mm

"A unique bolt securing system using tension instead of friction. When the bolt and/or nut is tightened, the teeth grip and seat the mating surface. The NORD-LOCK washers are locked in place, allowing movement only across the face of the cams. Any loosening movement of the bolt/nut is blocked by the wedge effect
"The NORD-LOCK bolt securing system uses geometry to safely lock bolted joints in the most critical applications.
This unique wedge-locking system offers the following advantages:

  • Maximum safety
  • Resists loosening caused by vibration and dynamic loads
  • Ease of assembly and disassembly
  • Locking function is not affected by lubrication
  • Positive locking at low and high preload levels
  • Controllable preload
  • Same temperature characteristics as standard bolt/nut
  • Reusable"


The science behind the system, See diagram pictured below,

"Tension makes the bolt self-locking

The key is the difference in angles. Since the cam angle " Œ± " is larger than the thread pitch " Œ? ", the pair of washers expand more than the corresponding pitch of the thread. NORD-LOCK washers positively lock the fastener in a joint which is subjected to extreme vibration or dynamic loads."