
PRAD system
Solution tool
PRAD system
Specification corresponding with standard blanks(DIN)
Main size designation and specification
① ② ③ ④ ⑤ STI ⑥ STI
metric unified whitworth sewing screw (metric) (unified)
M6×1 №12-24UNC W7/32-24 SM15/64-28 STI_M4.5×0.75 STI_№8-32UNC
№12-28UNF STI_M5×0.8 STI_№8-36UNF
STI_№10-32UNF
M8×1.25 1/4-20UNC W1/4-20 SM1/4-20 STI_M6×1 STI_№10-24UNC
M8×1 1/4-28UNF SM1/4-28 STI_№12-24UNC
5/16-18UNC W5/16-18 SM9/32-20 STI_№12-28UNF
5/16-24UNF SM5/16-18 STI_1/4-20UNC
STI_1/4-28UNF
M10×1.5 3/8-16UNC W3/8-16 SM11/32-28 STI_M8×1.25 STI_5/16-18UNC
M10×1.25 3/8-24UNF STI_5/16-24UNF
M12×1.5 7/16-14UNC W7/16-14 SM7/16-16 STI_M10×1.5 STI_3/8-16UNC
M12×1.25 7/16-20UNF STI_M10×1.25 STI_3/8-24UNF
STI_M10×1
PRAD SYSTEM
* 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-39