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Quick Guide to Precision Bore Gauges / Inside Micrometers
Measuring Instruments
Nomenclature
Contact point
(or anvil) Cone
C Spindle Sleeve Thimble Ratchet stop
Custom-Ordered Products (Holtest/Borematic)
Mitutoyo can custom-build an instrument best suited to your special application. Please feel free to contact Mitutoyo about the possibilities – even if only one custom-
manufactured piece is required. Please note that, depending on circumstances, such a micrometer will usually need to be used with a master setting ring for accuracy
assurance. (A custom-ordered micrometer can be made compatible with a master ring supplied by the customer. Please consult Mitutoyo.)
35-45mm 1DIV. 0.005mm 45
S/N000000 0
45 5
4
Type of Workpiece profile (example) Contact point tip profile (example) Remarks
feature
Square r Tip radius R that can measure W=1 or more
groove the minimum diameter
Round (different for each size)
groove
Spline H1 H2 d d 35-45mm
Serration r D D /N000000
Tip radius R that can measure W=1 or more Radius=0.5 or more Allows measurement of the diameter of variously shaped inside grooves
the minimum diameter
and splines.
(different for each size) Minimum measurable groove diameter is approximately 16 mm (differs
depending on the workpiece profile.)
Dimension should be as follows:
For W = less than 2 mm: = less than 2 mm
H 35-45mm For W = 2 mm or more: = 2 mm is the standard value which can be
/N000000
modified according to circumstances.
H W=0.5 or more Tip radius R that can measure The number of splines or serrations is limited to a multiple of 3.
r the minimum diameter Details of the workpiece profile should be provided at the time of placing
D d (different for each size) a custom-order.
If your application needs a measuring range different from that of the
standard instrument an additional initial cost for the master ring gauge
will be incurred.
35-45mm
/N000000
a 45 or more R=0.3 or more
D
d
r
35-45mm
/N000000
Threaded D Allows measurement of the effective diameter of an internal thread.
hole Measurable internal threads are restricted according to the type, nominal
35-45mm dimension, and pitch of the thread. Please contact Mitutoyo with the
/N000000 specification of the thread to be measured for advice.
C-43
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