{"product_id":"m20-21-4-x-39-0-x-3-4mm-nord-lock-washer-stainless-steel-sp-a4","title":"M20 21.4 x 39.0 x 3.4mm Nord-lock Washer Stainless Steel SP A4 NL20SPSS 2718","description":"\u003cp\u003eStainless steel. SP (enlarged outer diameter) 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.\u003c\/p\u003e","brand":"Nord-Lock","offers":[{"title":"Default Title","offer_id":53327607726346,"sku":"5023606","price":13.27,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/8391\/2714\/files\/1ee14826843222244c3e95e4aefcd4f4.jpg?v=1783493328","url":"https:\/\/fastenup.co.uk\/products\/m20-21-4-x-39-0-x-3-4mm-nord-lock-washer-stainless-steel-sp-a4","provider":"Fasten Up","version":"1.0","type":"link"}