Shanghai Detroit Precision Fastener Co., Ltd. (SDPF), founded in 2001 by Mr. James Gu and US Spiralock Corp., specializes in the production of DTFLOCK self-locking nuts and taps/gages with 30° wedge internal thread form. SDPF has been wholly owned by US Chester Technologies Corporation since 2006., DTFLOCK self-locking nuts and taps/gages ...
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