Osaka Forming Co Ltd’s E-Lock series has excellent anti-loosening capability. Now the series is added with lock nut used for bearing. The nut no longer requires key processing on the shaft nor shake-proof washer, therefore reducing the cost for shaft fastening. Another feature of the nut is its capability to bear intense vibration. – See more at: http://www.fastener-world.com.tw/new/news_detail.php?id=4552#sthash.TGyLZvVc.dpuf