Shanghai Detroit Precision Fastener Co. , Ltd. (SDPF) was established in 2001 by US Spiralock Corporation in shanghai, China. SDPF's main products are special self- Locking/ Anti- Loosening (DTFlock) nuts which have many advantages, Such as simple, Anti- Loosening, Anti- Vibration and repeatable usage, Etc. It has been widely used in many ...
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