The utility model relates to a measurement device for be used for nonstandard internal thread of heavy -calibre belongs to the machinery processing technology field, including loop bar (1), spring (2), contact pilotage (3), activity contact pilotage (4), hand (hold) (5), loop bar (1) and contact pilotage (3) interference fit, loop bar (1) and activity contact pilotage (4) clearance fit, hand (hold) (5) are passed loop bar (1) side and are gone up and lead to groove and activity contact pilotage (4) through screw thread immobilization connection, spring (2) are arranged in between loop bar (1)interior contact pilotage (3) and movable contact pilotage (4), hand (hold) (5) on to the side of loop bar (1) logical inslot can follow the axial and control and freely remove. Compared with the prior art, the utility model discloses a measuring device simple structure, convenient operation, the thread processing in -process uses this measuring device in nonstandard heavy -calibre, but whether the big footpath of quick test internal thread has processed in the tolerance range, detection efficiency has effectively been improved.