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) M42×4.5 W1 5/8-5 STI_M36×4 STI_1 3/8-6UNC M42×4 M42×3 M42×2 - STI_M39×2 STI_1 1/2-12UNF M42×1.5 M42×1 M42×4.5 M42×4 M42×3 M42×2 M44×2 M44×1.5 M44×2 M45×4.5 1 3/4-5UNC W1 3/4-5 STI_M39×4 STI_1 1/2-6UNC M45×4 1 3/4-6UN M45×3 1 3/4-8UN STI_M39×3 M45×2 1 3/4-12UN M45×1.5 1 3/4-16UN M45×1 1 3/4-20UN M45×4.5 M45×4 M45×3 M45×2 M46×4 M46×3M46×2 - - M46×1.5 M46×4 M46×3 - - M46×2 M48×5 M48×4 M48×3M48×2 - - M48×1.5 M48×1 M48×5 M48×4 M48×3 M48×2 * 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-29