Taper gauge to the ANSI standard they will not true to each other. The machine taper ID is made with a decreasing taper, while the tool holder’s OD is made with an increasing taper. The proper ordering procedure is to order a PLUG to the standard and a “check ring” to check the plug for wear, and vise versa the RING to the plug.


Protool supplies a complete range of cylindrical tapered ring gauges for National Machine Tapers, Jarno Tapers, Brown and Sharpe Tapers and Morse Tapers. All standard tapers are manufactured per ASME/ANSI B5.10 Class Z unless otherwise specified.

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