PRAD SYSTEM PRAD system Solution tool PRAD system Specification corresponding with standard blanks(DIN) Main size designation and specification ① ② ③ ④ ⑤ STI ⑥ STI metric unified whitworth sewing screw (metric) (unified) M6×1 №12-24UNC W7/32-24 SM15/64-28 STI_M4.5×0.75 STI_№8-32UNC №12-28UNF STI_M5×0.8 STI_№8-36UNF STI_№10-32UNF M8×1.25 1/4-20UNC W1/4-20 SM1/4-20 STI_M6×1 STI_№10-24UNC M8×1 1/4-28UNF SM1/4-28 STI_№12-24UNC 5/16-18UNC W5/16-18 SM9/32-20 STI_№12-28UNF 5/16-24UNF SM5/16-18 STI_1/4-20UNC STI_1/4-28UNF M10×1.5 3/8-16UNC W3/8-16 SM11/32-28 STI_M8×1.25 STI_5/16-18UNC M10×1.25 3/8-24UNF STI_5/16-24UNF M12×1.5 7/16-14UNC W7/16-14 SM7/16-16 STI_M10×1.5 STI_3/8-16UNC M12×1.25 7/16-20UNF STI_M10×1.25 STI_3/8-24UNF STI_M10×1 * Corresponding pitches meet with the pitches of other kinds. * Concerning Hand of threads, both right and left are applicable in the same blank. * Concerning the kind of taps, SP, PO, HT, ROLL are applicable in the same blank. * Concerning applicable thread limits, maximum applicable thread limits for metric coase threads are listed. PRAD-39