PRAD SYSTEM PRAD system Solution tool PRAD system Specification corresponding with standard blanks(for Japanese market) Main size designation and specification ① ② ③ ④ ⑤ STI ⑥ STI metric unified whitworth sewing screw (metric) (unified) M8×1.25 5/16-18UNC W5/16-18 SM9/32-20 STI_M6×1 STI_№10-24UNC SM5/16-18 STI_№12-24UNC STI_№12-28UNF STI_1/4-20UNC STI_1/4-28UNF 1/4-20UNC W1/4-20 M8×1 1/4-28UNF 5/16-24UNF M8×0.75 M10×1.5 3/8-16UNC W3/8-16 SM11/32-28 STI_M8×1.25 STI_5/16-18UNC STI_5/16-24UNF M10×1.25 M10×1 3/8-24UNF M12×1.75 W7/16-14 SM7/16-16 STI_M10×1.5 STI_3/8-16UNC STI_3/8-24UNF M12×1.5 7/16-14UNC STI_M10×1.25 M12×1.25 STI_M10×1 M12×1 7/16-20UNF M12×0.75 * 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-37