Tightening

When the bolt and/or nut is tightened, the teeth grip and seat the mating surfaces. Since the cam angle α, is larger than the thread pitch β, a wedge effect is created by the cams, preventing the bolt from rotating loose.​ The Nord-Lock wedge-lock washer is locked in place, allowing movement only across the face of the cams. Any attempt from the bolt/nut to rotate loose is blocked by the wedge effect of the cams.

Untightening

When a bolt is untightened with a wrench, the pair of washers expand more than the corresponding pitch of the thread, allowing the bolt/nut to rise. Nord-Lock wedge-lock washers positively secure the fastener in a joint which is subjected to any kind of vibration or dynamic loads.

Features

• Standard range available for bolt sizes M3 - M130
• Washers available in 5 different materials - steel, stainless steel, 254 SMO®, INCONEL® / HASTELLOY® and C-276 INCONEL® 718
• Washers available with enlarged outer diameter (SP washers)
• Reliable bolt securing system at high and low clamp loads

How it works

Nord-Lock X-series washers combine Nord-Lock wedge-locking technology with compensation against settlements. The wedge effect prevents bolt loosening caused by vibrations and dynamic loads, while the washer also reduces slackening and compensates against loss of preload.

Features

• Standard range available for bolt sizes M6 - M20
• Washers available in steel material
• Washers available with enlarged outer diameter (SP washers)
• Prevents bolt loosening caused by vibration and dynamic loads, and reduces slackening and compensates against loss of preload, while also reducing slackening and compensating against loss of preload.