Norma Din 862

DIN862
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CALIPER ACCURACY SPECIFICATIONS AND CALIBRATION INFORMATION

The information in this document applies to the caliper form types shown above.
Conversion:
mm to ins. = mm / 25.4 (50mm = 1.9685 ins.)
1µm (0,001mm) ins. ~ 0.00004 ins. (30µm = 0.00118 ins.)
The most internationally widely used caliper standard (DIN 862 Vernier calipers; requirements, testing)
gives thefollowing requirements (all in mm) for caliper measurement accuracy:
A more comprehensive version of this table (and much more) can be found in DIN 862
Accuracy limits G1) in µm (0,001mm)
Measurement length
Scale values:
Vernier and Dial
Digital
(mm)
0,1 and 0,05
0,02
0,01
50
20
20
50
100
200
300
30
30
400
60
500
70
600
80
700
90
800
100
40
40
900
110
1000
120
1200140
50
1400
160
--1600
180
60
1800
200
2000
220
G1) values should be increased by 20 µm when measuring inside and depth measurements.
The parallelism of measuring faces shall be preserved after locking.
DIN 862 is the standard used by most manufacturers as the referenced requirement and testing standard.
As the above table is only a small portion of the actual standard, it isrecommended that DIN 862 be read by
anyone wishing all information. It is available in (at least) German and English.
DIN 862 is identical to ISO 2012

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For those that wish to be reasonably sure of their caliper functionality and accuracy , the following three pieces
of advice/information may be useful.
Caliper Calibration Information
For caliper form types 1A, 2A, B,D and E note that the reading is carried out by vernier, dial or digital display.
While DIN 862 states requirements more than those that having direct influence on measurement accuracy
(secondary requirements to form, material etc.), then only those requirements pertinent to measurement
accuracy are dealt with here.
DIN 862 does not have special requirements to repeatability. Two importantfactors having direct in fluence on
measurement accuracy is the ability to establish a uniform measurement pressure and the caliper’s measuring
surfaces in relation to the reference (gauge blocks or ring gauges).
Reading deviation is the difference between the caliper’s actual
measurement and the “true” value. In other words, the difference
between the caliper reading and the reference standardused.

Measurement
surfaces

Din 862 specifies requirements as to by how much the measurement
deviation may vary. If measurements are carried out with different
measurement force directions then there is an extra allowance.

Knife shaped
Rounded

Reference ring
gauge
Ø 5 mm
Ø 20 mm
Ø 30 mm

The allowance for G (see table on page 1 - 4) for scale values 0,1 and 0,05mm is (20 +1/10 mm) µm.
The allowance for G (see table on page 1 - 4) for scale values 0,02 and 0,01mm is (22 + 1/50 mm) µm.
Requirements for external and internal measurement with measurement jaws of form types 1A, 2A, B, D and E
are given in the table on page 1 - ?. These requirements are also applicable to form type B with the knife edged
and rounded measurement surfaces. The allowances for G forinternal and depth measurement apply when
relevant.
As mentioned for G1) in the table on page 1 - 4 this allowance also applies to depth measurement with the
depth rod shown in form types 1A and 2A.
In principle all caliper measuring surfaces (external,
internal and depth) should be calibrated. However, as it
is the same scale being read, then it is enough to
calibrate this once. The scale isnormally calibrated at
several points with the jaws for external measurement.
If there is more than one set of jaws for external
measurement then the longest should be chosen. The
other measuring surfaces only need calibration at one
or two points.

Recommended measurement steps
Measurement
point No.

The result is shown on the scale (or display) and the
deviation to the reference be...