Nta: Nws yog tsim nyog los ua ob peb threaded workpieces ntawm proofing pieces, ntau xov specifications thiab qauv, thiab nws kuj ua tau American threads. Ib leeg buckle hniav muaj kev ua haujlwm tsawg, muaj zog thoob ntiaj teb, thiab siv tau yooj yim.