{"product_id":"m20-21-4-x-30-7-x-3-4mm-nord-lock-washer-stainless-steel-a4","title":"M20 21.4 x 30.7 x 3.4mm Nord-lock Washer Stainless Steel A4","description":"\u003cp\u003eStainless Steel Tension makes the bolt self-locking Nord-Lock wedge-locking technology secures bolted joints with tension instead of friction. The system comprises of a pair of washers that has cams on one side and radial teeth on the opposite side. Nord-Lock wedge-locking products positively lock the fastener in a joint which is subjected to extreme vibration or dynamic loads. The key is the difference in angles. Since the cam angle \" α \" is larger than the thread pitch \" β \", the pair of washers expand more than the corresponding pitch of the thread. Refer to the second picture in images.\u003c\/p\u003e","brand":"Nord-Lock","offers":[{"title":"Default Title","offer_id":53327607431434,"sku":"5023604","price":7.98,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/8391\/2714\/files\/a35bcbf8932009b3ad36b984195a14e3.jpg?v=1783493315","url":"https:\/\/fastenup.co.uk\/products\/m20-21-4-x-30-7-x-3-4mm-nord-lock-washer-stainless-steel-a4","provider":"Fasten Up","version":"1.0","type":"link"}