Measurement of diameter and length

BMD – Plug Gauge DIATEST

BMD in Action
BMD in Action
Special-BMD in Action
Special-BMD in Action
BMD-OD for measurement of O.D. with hanger
BMD-OD for measurement of O.D. with hanger

Easy-to-use, self-indicating and self-centering bore gauge for the measurement of inner- and outer diameter, with highest precision and absolute accurate results.

Field of application is the production of high-precision bores within a standard range of Ø 2.0 mm (T-BMD) up to 270 mm in serial production. 

Plug Gauge BMD allows:

  • Static and dynamic measurement
  • Detection of dimensional deviations and shape defects
  • As a hand tool in bores directly at the machine
  • Fitting in measuring fixtures and machines

A wide selection of basic types in the standard program, supplemented by useful accessories, ensures that nearly all bores encountered in current practice can be measured precisely. Its flexible platform allows a wide area of application:

  • Standard- und Through bores: from 2.0 to 270 mm,
  • Measurement of Blind Bores(Flat-Bottom): from 2,0 (T-BMD-FB) to 150 mm,
  • Measurement of O.D.: from 20 to 100 mm,
  • Multiplane plug gauges: from 21 mm,
  • Internal gear gauges: from 10 mm cylinder diameter
  • 3-Point Measurement: from 8.0 to 100 mm,
  • For very small diameters from 2.0 mm to 3.0 mm
  • Measurement of parallel distances: from 1.0 (T-BMD-PA) to 30 mm
  • Special sizes,shapes and models, e. g. tapered bores
  • Extension or limitations of the measuring range, adjustment of the measuring pressure, air supply,…

BMD (standard design) have a hard chrome coating on guiding cylinders, with approx. 1000 HV. Most of them are suitable for rough measurement conditions.


  • 2-point design =< 1 µm
  • 3-point design =< 2 µm

The selection of gauging contact material depends on composition and design of the work piece:

  • Carbide,
  • Hard chrome,
  • Ceramic,
  • Ruby,
  • Plastic,
  • Diamond.

Mechanical or digital indicators, DIATRON1000, probes including the measuring column DIATRON2200 can be used to display results The Multiplane BMD DIATRON MultiFire can be integrated into a DIAWIRELESS network.

Devices as e. g. the DIATRON6060-µNetwork allow statistical evaluations, integration into a network, machine control and much more.

Zero setting should be performed by using a setting master, e. g. a setting ring according to specifications of DIN 2250-C.

The fast maintenance and repair service gives reconditioned and fully tested plug gauges. There is often no need to buy new plugs. BMD can be used economically for many years.

A wide range of application and an easy handling in combination with highest precision and sturdy design demonstrate the economic efficiency of the BMD-system. Special solutions on request.

BMD for automatic measurement
BMD for automatic measurement
Industrie 4.0


BMD Plug Gauge Technical Guide
BMD general brochure