Notes: the range extensions (item #16) have a thread diameter of 7/16-40. We provide this information in case the threads on the measuring head are damaged and need to be re-tapped.
* Special centralizing extensions (#13) and plunger extensions (#14) are needed when measuring above 9" in diameter. To determine which size extensions you will need, please refer to the details on page 13.
** Range extension set X2-85867 does not include extension #13 or extension #14 as shown in the drawing. If you need these, they must be ordered separately.
*** The range extension kit B0-85966 will allow you to measure beyond the standard range of this bore gage, up to 24.56 inches. The kit consists of the following 6 items:
- (3 pieces) 4" long range extensions which can be combined
- (1 piece) .625" gaging plunger extension
- (2 pieces) .975" centralizing plunger extension
In theory, multiple extensions can be combined but at some point the accuracy will suffer. If accuracy is critical, then a different bore measuring gage must be considered. We have no data to substantiate this.
**** We need to know if the dial unit has a 1” bore or a 5/8” bore. The old Poughkeepsie dial units for a #6 would all have the 1” bore. Many of the Dorsey dial units would have 5/8” bores. Either way the part number is X2-81006-12
Mitutoyo 293-344 Coolant Proof LCD Micrometer, Ratchet Thimble, 0-1"/0-25.4mm Range, 0.00005"/0.001mm Graduation, +/-0.00005" Accuracy, Without SPC