It wad established in 2001 by US Spiralock Corporation, China. SDTF's main product was Spiralock Self-Locking &Anti-Loosening Nuts. It was US Spiralock Corporation only wholly owned manufacturing facility in the world. Recently, Spiralock Corp was purchased by US Black and Decker. New trademarks "DTFlock' and "DTF" are created and now used for SDTF'S Self-Locking and Anti-Loosening Nuts. SDTF has a capacity to make over 100 Millions PCS of DTFlock Nut per year 200, 000 PCS of DTFlock Taps/gages. SDTF is free to sell its products outside of China, including US and European markets.
