PRAD SYSTEM PRAD system Solution tool PRAD system Specification corresponding with standard blanks(for Japanese market) Material Symbols HSS:○   HSS-Co:●   HSS-P:◎ Main size designation and specification ① ② ③ ④ ⑤ STI ⑥ STI metric unified whitworth sewing screw (metric) (unified) M12×1.75 M12×1.5 M12×1.25 M12×1 M13×1.75 1/2-13UNC W1/2-12 M13×1.5 1/2-16UN STI_M11×1.5 M13×1.25 1/2-20UNF STI_M11×1.25 STI_7/16-20UNF M13×1 1/2-28UNEF M13×0.75 1/2-32UN M13×0.5 M13×1.75 M13×1.5 M13×1.25 M13×1 M14×2 M14×1.5 STI_M12×1.5 STI_7/16-14UNC M14×1.25 STI_M12×1.25 M14×1 STI_M12×1 M14×0.75 M14×0.5 M14×2 M14×1.5 M14×1.25 M14×1 M15×2 9/16-12UNC W9/16-12 STI_M12×1.75 M15×1.5 9/16-16UN STI_M13×1.5 9/16-18UNF M15×1.25 9/16-20UN STI_1/2-20UNF M15×1 9/16-24UNEF 9/16-28UN M15×0.75 9/16-32UN M15×0.5 M15×2 M15×1.5 M15×1.25 M15×1 M16×2 5/8-11UNC W5/8-11 STI_1/2-13UNC 5/8-12UN STI_M13×1.75 M16×1.5 5/8-16UN STI_M14×1.5 5/8-18UNF M16×1.25 5/8-20UN STI_M14×1.25 M16×1 5/8-24UNEF 5/8-28UN M16×0.75 5/8-32UN M16×0.5 * 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. * is a blank for Z-PRO. PRAD-19