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) M35×3 1 3/8-6UNC W1 3/8-6 STI_M30×3.5 STI_1 1/4-12UNF 1 3/8-8UN M35×2 1 3/8-12UNF M35×1.5 1 3/8-16UN M35×1 1 3/8-18UNEF 1 3/8-20UN - 1 3/8-28UN M35×3 M35×2 M36×4 STI_M33×2 M36×3 - - M36×2 M36×1.5 M36×1 M36×0.5 M36×4 M36×3 M36×2 M37×1.5 - - M38×3 STI_M33×3.5 STI_1 1/4-7UNC M38×2 - - M38×1.5 STI_1 3/8-12UNF M38×1 M38×0.5 M38×3 M38×2 M39×4 1 1/2-6UNC W1 1/2-6 STI_M36×2 M39×3 1 1/2-8UN M39×2 1 1/2-12UNF M39×1.5 1 1/2-16UN M39×1 1 1/2-18UNEF 1 1/2-20UN 1 1/2-28UN M39×4 M39×3 M39×2 M40×4 STI_M36×3 M40×3 - - M40×2 M40×1.5 M40×1 M40×4 M40×3 M40×2 * 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-27