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External Micrometer 250-275 0.01 MMZb Kinex
5981
€71.21 tax inc.
Net price: €57.89
Description
Outside micrometer 250–275 mm – 0.01 mm resolution
Technical data and instrument construction
| Technical data | |
|---|---|
| Measuring range | 250–275 mm |
| Resolution | 0.01 mm |
| Measuring face flatness | 0.006 mm |
| Measuring tips | cemented carbide |
| Ratchet force | 5–10 N |
| Micrometer screw pitch | 0.5 mm per revolution |
| Spindle lock | yes |
| Included | adjusting wrench, 250 mm setting standard |
READOUT0.01 mm
TIPScemented carbide
MEASURING FORCE5–10 N
LOCKspindle
MMZb outside micrometer – construction and applications
Applications for an instrument with this measuring range
Outside micrometer 250–275 mm is an analog instrument with a resolution of 0.01 mm for checking medium-sized external dimensions. The bow-shaped frame (designation MMZb) has a larger opening, allowing the instrument to accommodate workpieces that cannot be measured with a basic-range micrometer. The micrometer screw with a pitch of 0.5 mm provides 50 divisions of 0.01 mm per thimble revolution.
The cemented carbide measuring tips maintain a flatness of 0.006 mm even under heavy use. The ratchet maintains a measuring force of 5–10 N, so the result does not depend on the operator's hand force. The spindle lock holds the reading while it is read. DIN 863 defines the accuracy of micrometers in this class; with this frame opening, frame rigidity is also important to limit deflection under measuring force.
Typical applications:
- measuring the diameters of shafts, sleeves, and bearing journals in the 250–275 mm range,
- checking dimensions after turning and grinding before assembling mating parts,
- measuring the thickness of housings, flanges, and welded components,
- in-process and acceptance inspection in machining departments.
How to read the measurement
Sleeve and thimble scales step by step
Hundreds of millimeters in the range
200.00
+
Sleeve
62.50
+
Thimble
0.32
=
Measurement result
262.82 mm
The result consists of two readings. Whole and half millimeters are read on the sleeve — the whole-millimeter marks are below the reference line, and the 0.5 mm marks are above it. Hundredths of a millimeter are read on the thimble at the reference line. In the illustrated example, the thimble edge has passed the 62.5 mark, and the reference line indicates division 32, giving a result of 262.82 mm.
Steel expands by approximately 11.5 µm per meter for a temperature change of 1°C. A workpiece with a diameter of 275 mm that is 5°C warmer than the instrument is approximately 0.016 mm larger. The workpiece and micrometer should therefore be at the same temperature, preferably close to 20°C.
Do not tighten the spindle beyond the ratchet's slipping point
Excessive force distorts the result and can permanently deform the measuring faces. Turn only the ratchet knob until it starts to slip, then hold the reading with the spindle lock.
Micrometer precision in figures
Parameters relevant to workshop tolerances
0.006 mm
Measuring face flatness
Carbide tips maintain their flatness through years of daily workshop use.
50 divisions
One thimble revolution = 0.5 mm
The micrometer screw pitch divided into 50 divisions gives a reading of 0.01 mm per division.
5–10 N
Constant ratchet force
The ratchet slips when the measuring force is reached — the result does not depend on the operator's hand force.
Set contents and zero setting
Preparing for the first measurement
Included
Adjusting wrench
For adjusting the sleeve when setting zero on the setting standard.
Included
Setting standard 250 mm
Length standard for setting the zero point before the first measurement.
Before measurement, set the instrument's zero using the included 250 mm setting standard: close the tips onto the standard using the ratchet and check that the scale reads exactly 250.00 mm. Correct any deviation by rotating the sleeve with the adjusting wrench.
Measuring with a micrometer step by step
Procedure for repeatable results
Four steps to a repeatable result
1 Set zero on the standard
standard: 250 mm
2 Close using the ratchet
force: 5–10 N
3 Lock the spindle
lock reading
✓ Read the result
resolution: 0.01 mm
Full reading: sleeve and thimble readings plus the full hundreds of millimeters in the range (200 mm).
The 250–275 mm outside micrometer combines a simple, reliable analog design with a resolution of 0.01 mm. Carbide measuring tips, constant ratchet force, and a spindle lock ensure repeatable results over years of use. It is essential equipment for quality control stations wherever outside diameter measurement must be more reliable than with a caliper.
Frequently asked questions
The ratchet limits the force to 5–10 N and slips when this force is reached. Every measurement is therefore made with the same force, regardless of the operator's hand force — a requirement for repeatability at a resolution of 0.01 mm.
Cemented carbide is many times more wear-resistant than tool steel, so a flatness of 0.006 mm is maintained for years. The condition of the faces should be checked periodically when setting the instrument's zero.
After use, clean the measuring faces and leave the tips slightly apart to prevent them from sticking together as temperatures change. Do not tighten the spindle beyond the ratchet's slipping point, and protect the instrument from falls — after an impact, it must be checked against a standard.
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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