Nomenclature
- "Taper Plug Gauge" - for internal (female) spindle tapers
- "Taper Ring Gauge" - for external (male) spindle noses
- Applicable standards: A series, D series, Morse (DIN 229), steep tool tapers (CAT, HSK)
Applicable Standards and Sizes
- A2 and D1 spindle nose tapers (sizes 3 to 15) commonly used in Indian and global lathes
- Morse tapers MT0 to MT6 for drill press and lathe spindle inspection as per DIN 229
- Steep tapers such as CAT, NMTB, and HSK types as per ISO, DIN, or JIS standards
Selection and Ordering
Select the gauge type based on your spindle interface (A series, D series, Morse, CAT, HSK).
Specify size (example: A2 8, MT2, HSK A40), plug or ring type, and accuracy grade.
Include calibration certificate request if required for high-precision or aerospace use.
- Example: Smitra A2 8 plug and ring set
- Example: Morse MT2 plug gauge (DIN 229 compliant)
- Example: HSK A40 pneumatic plug gauge with certificate
Description and Features
These gauges verify the fit and alignment of spindle noses and tool holders, reducing runout and ensuring proper seating.
Plug gauges fit inside spindle bores; ring gauges fit over the spindle nose or chuck mounting face.
Made from hardened, ground, and lapped alloy steel with high dimensional accuracy.
- Portable and suitable for use on the shop floor
- Available for Morse tapers MT0 to MT6, CAT, HSK, and NMTB tapers
- Optional pneumatic versions with dial indicators for contactless inspection
Common Uses
- Checking spindle or chuck taper accuracy before machine setup
- Routine inspection and maintenance of lathe or CNC machines
- Calibrating tool length offsets using reference plug gauges
- Verifying safe tool retention and alignment in high-speed machining
Scope of Supply
Supplied as individual plug, ring, or combined sets based on customer requirement.
Size options: A series or D series sizes 3 to 15, Morse MT0 to MT6, HSK and CAT tapers up to size 100.
Optional calibration certificates traceable to national and international standards.
Care and Maintenance
- Clean after each use and remove any chips or coolant
- Apply light protective oil before storing
- Verify gauge accuracy periodically with master references or certified labs
- Monitor taper wear as even slight deviation affects precision machining
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