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) M27×3 M27×2 M27×1.5 M28×3 STI_1-12UNF M28×2 M28×1.5 M28×1 M28×0.5 M28×3 M28×2 M28×1.5 M30×3.5 1 1/8-7UNC W1 1/8-7 M30×3 1 1/8-8UN STI_M24×3 M30×2 1 1/8-12UNF STI_M27×2 STI_1-8UNC M30×1.5 1 1/8-16UN STI_M28×1.5 M30×1 1 1/8-20UN 1 1/8-28UN M30×0.5 M30×3.5 M30×3 M30×2 M30×1.5 M32×3 1 1/4-7UNC W1 1/4-7 STI_M27×3 STI_1 1/8-12UNEF M32×2 1 1/4-8UN M32×1.5 1 1/4-12UNF 1 1/4-18UNEF M32×1 1 1/4-20UN M32×0.5 1 1/4-28UN M32×3 M32×2 M32×1.5 M33×3.5 STI_M30×2 M33×3 M33×2 - - M33×1.5 M33×1 M33×3.5 M33×3 M33×2 M33×1.5 M34×3M34×2 - - STI_M30×3 STI_1 1/8-7UNC M34×1.5 M34×1 M34×3 M34×2 * 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-25