Precision Granite Master Cylinders

TAC Rockford Precision Granite Master Cylinders are the standard for verifying the perpendicularity, straightness, and runout of critical machine axes on high-precision machine tools and CMMs. Manufactured from select, high-density black granite, these cylinders offer unmatched dimensional stability and thermal inertness, making them essential for the most demanding metrology applications.


Standard sizes range from 200mm (7.87in) to 800mm (31.5") in height. Custom diameters, heights, and other special versions available upon request
- contact our engineering team for specialized configurations.

High Precision Steep Taper Gauge Masters

The High Precision Gauge Masters are made of a proprietary stabilized gauge material and are coated to resist corrosion. Actual dimensions are laser marked on the master. Included is a certificate with actual dimensions and a wooden storage case.

Zero Master Analog Setup Indicator

The Zero Master is the smallest 3D-Sensor worldwide. Usage, function and accuracy are equal to the Universal 3D-Sensor. The size of the Zero Master is adapted to small machines. The clamping shank has a diameter of 10 mm. Thus it can be also used on machines with ISO 30 or with small HSK spindles. The housing is shortened and does not protrude far out of the spindle so that even big work pieces can be measured. The Zero Master can be read with a small analog dial gauge.

Precision Measuring Cylinders

Hardened special steel. Machined base and jacket surface.

Workpiece Holding Clamping Systems

BERG-Spanntechnik offers an extensive range of power operated chucks and hydraulic cylinders which meet all the requirements of modern CNC lathes as there are effective clamping force, attainable numbers of rotation, and precision, as well as center hole width for bar stock.

High Precision HSK Gauge Masters

To check the extremely small tolerances required by the DIN and ISO
standards for HSK tool holders.

PSC Master Setting Gauges

HSK Certified Master Taper Gauge

These taper master gauges can be used for zeroing the dial indicators on our HSK Tool Holder Inspection Gauges.

HSK Tool Holder Taper Inspection Gauge

Designed to detect tool holder taper wear in seconds.

The tool holder taper inspection gauge includes two Fixture Bases, two 0.001mm Indicators, and a carrying case. An optional 410.148 certified Taper Master is strongly recommended for zeroing the Indicators. If a master is not available, a known good tool holder can be used in place of the master. Click the Details Tab for more information.