Standard blank dimension table (for Japan)

Main size designation and specification
① metric② unified③ whitworth④ sewing screw⑤STI (metric)⑥STI (unified)
M8×1.25 M8×1 M8×0.755/16-18UNC 5/16-20UN 5/16-24UNF 5/16-28UN 5/16-32UNEFW5/16-18STIM6×1STI1/4-20UNC STI1/4-28UNF
M9×1.25 M9×1
M10×1.5 M10×1.25 M10×13/8-16UNC 3/8-20UN 3/8-24UNF 3/8-28UNW3/8-16STIM8×1.25 STIM8×1STI5/16-18UNC STI5/16-24UNF
M11×1.5 M11×1.25 M11×1STIM9×1.25 STIM9×1STI3/8-24UNF
M12×1.75 M12×1.5 M12×1.25 M12×17/16-14UNC 7/16-16UN 7/16-20UNF 7/16-28UNEFW7/16-14STIM10×1.5 STIM10×1.25 STIM10×1STI3/8-16UNC
M13×1.75 M13×1.5 M13×1.25 M13×11/2-13UNC 1/2-16UN 1/2-20UNF 1/2-28UNEFW1/2-12STIM11×1.5 STIM11×1.25STI7/16-20UNF
M14×2
M14×1.5 M14×1.25STIM12×1.5 STIM12×1.25STI7/16-14UNC
M14×1STIM12×1
M15×29/16-12UNCW9/16-12STIM12×1.75
M15×1.5 M15×1.25 M15×19/16-16UN 9/16-18UNF 9/16-20UN 9/16-24UNEF 9/16-28UNSTIM13×1.5STI1/2-20UNF
M16×2 M16×1.55/8-11UNC 5/8-12UN 5/8-16UN 5/8-18UNFW5/8-11STIM13×1.75 STIM14×1.5STI1/2-13UNC
M16×1.25 M16×15/8-20UN 5/8-24UNEF 5/8-28UNSTIM14×1.25
STIM14×2
M17×1.5STI9/16-18UNF
M18×2.5
M18×2STI9/16-12UNC
M18×1.5 M18×1.25STIM16×1.5STI5/8-18UNF
  • Corresponding pitches meet with the pitches of other kinds.
  • Concerning Hand of threads, both right and left are applicable in the same blank.