844 N / 844 NH Intramess Mahr Federal Cylinder Bore Gages
The Mahr Federal adjustable cylinder bore gage kits have been built on the idea of precision measurement under tough shop conditions. Robust and easy to use, they provide a fast and accurate method for checking bores in most industrial environments and applications. When supplied withthe 1087 BR digital indicator they proved high resolution, fast response and simple use for the inexperienced operator with dynamic capabilities. Other features include:
- Measuring the diameter, roundness and conical form of a bore as well as the distances of plane-parallel surfaces
- Measuring head consists of a carbide tipped moving anvil and an interchangeable stationary anvil which has a hardened steel ball; alternatively a carbide ball is available
- Transmission lever system transfers movement of the movable anvil to indicating instrument
- The broad centering bridge ensures automatic centering in the bore
- Insensitive to temperature due to both the shank and transfer rod being made from heat resistant *Invar steel
- Highly resistant to wear due to the carbide tipped moving anvil
- Constant measuring force due to built-in spring thus eliminating user influence
- Universally applicable and extremely versatile as every instrument spans a broad measuring range, within this range it is quick and easy to adjust to any size
- Measuring head, holder, extensions, right-angle attachments and depth stops are all part of this extensive modular system
- Supplied with: Holder, measuring head, stationary anvil, wooden case, excludes an indicating instrument
*Invar steel has a particularly low expansion coefficient and thus makes the instrument totally insensitive to any kind of heat. Body heat from the user, increases in ambient temperature have no influence on the measuring results!
Measuring range (mm) |
Measuring range (in) |
Error limit Ge μm |
Repeatability fw μm |
Hysteresis fu μm |
Order no* 844 N |
Order no* 844 NH |
18 - 50 | .7 - 2“ | 2 | 0.5 | 2.5 | 4474000 | 4475000 |
35 - 100 | 1.4 - 4“ | 2 | 0.5 | 2.5 | 4474001 | 4475001 |
100 - 250 | 4 - 10“ | 2 | 0.5 | 2.5 | 4474002 | 4475002 |
250 - 400 | 10 - 16“ | 3 | 1.5 | 3.5 | 4474003 | 4475003 |
400 - 800 | 16 - 32“ | 3 | 1.5 | 3.5 | 4474004 | 4475004 |
250 - 800 | 10 - 32“ | 3 | 1.5 | 3.5 | 4474005 | 4475005 |
Indication unit sold separately. Add a Mahr 4337162 indicator to complete the system or add your own 8mm shank indicator. Contact us for details.
Features
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With a 2 point inside measuring instrument the point of reversal is automatically determined through rocking back and forth.
The actual value is detected and stored by the MIN function and indicated in the display (3).
Readings mm / inch | Display range mm / inch |
0.001 / .00005” | ± 0.02 / ± .001“ |
0.002 / .0001” | ± 0.04 / ± .002“ |
0.004 / .0005” | ± 0.08 / ± .01“ |
0.01 / .001” | ± 0.2 / ± .02“ |
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