• Please be informed that our office will be closed for upcoming Labour Day holiday on 1st May 2019. There may be potential delay of response/shipment from supplier due to Japan Golden Week holiday which falls on 27th April to 6th May 2019.
    We seek your kind understand, should there be any delay. Click here for details


Fuji Seimitsu Co., Ltd. is a comprehensive manufacturer of self-locking nuts with industry-first metal ring locking capability. Fine U-NUTs are self-locking nuts developed for fastening bearings used in particularly harsh environments. Key groove processing on the shaft is not required, increasing "rationality" and "safety" of work processes. Even easier mounting gives excellent "workability". Increased performance of various machinery products, higher product quality and lighter weight has led to "safe" and "reliable" products with a great reputation.