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Parallel gauge blocks

Points to note about parallel gauge blocks Information Site

Parallel gauge blocks
Parallel gauge blocks are currently the length measurement standard with the smallest measurement uncertainty. They form the basis
of industrial length measurement technology because most measurements in this field refer back to parallel gauge blocks as their reference
standards.
Selection of the tolerance classes
Tolerance Class 0
As the primary standard for monitoring working gauge blocks.
For setting measuring instruments and measuring machines with high accuracy.
Tolerance Class 1
For setting and calibrating gauges and measuring devices in testing rooms and inspection areas.
Tolerance Class 2
Standard gauge blocks, in general use as practical measurement standards at testing positions in manufacture for setting, checking,
calibrating measuring instruments, tools and fixtures.
Material selection
Steel guaranteed for normal use. Many years of normal use without unacceptable reduction in accuracy.
Carbide is an exceptionally durable material. Parallel gauge blocks made of carbide are recommended if the abrasive nature of the envi-
ronment demands high surface hardness / resistance to abrasion.
Ceramic material is extremely hard-wearing. Its superior material properties are the result of high hardness combined with high
toughness. With minimal sensitivity to shock, high resistance to abrasion and high corrosion resistance to acids and alkalis, it is the
ideal material for use even in production-related areas and measuring laboratories.

Parallel gauge blocks: maximum length deviation from nominal length (at any point*) and tolerances for the deviation
range (Extract from DIN EN ISO 3650, table 4)
Tolerance Class 0 Tolerance Class 1 Tolerance Class 2
Nominal Maximum length Tolerance for the Maximum length Tolerance for the Maximum length Tolerance for the
size range deviation from deviation span deviation from deviation span deviation from deviation span
nominal length* nominal length* nominal length*
t v t v t v
mm ± t e µm ± t e µm ± t e µm
from to µm µm µm
- 10 0.12 0.10 0.20 0.16 0.45 0.30
10 25 0.14 0.10 0.30 0.16 0.60 0.30
25 50 0.20 0.10 0.40 0.18 0.80 0.30
50 75 0.25 0.12 0.50 0.18 1.00 0.35
75 100 0.30 0.12 0.60 0.20 1.20 0.35
100 150 0.40 0.14 0.80 0.20 1.60 0.40
150 200 0.50 0.16 1.00 0.25 2.00 0.40
200 250 0.60 0.16 1.20 0.25 2.40 0.45
250 300 0.70 0.18 1.40 0.25 2.80 0.50
300 400 0.90 0.20 1.80 0.30 3.60 0.50
400 500 1.10 0.25 2.20 0.35 4.40 0.60
500 600 1.30 0.25 2.60 0.40 5.00 0.70
600 700 1.50 0.30 3.00 0.45 6.00 0.70
700 800 1.70 0.30 3.40 0.50 6.50 0.80
800 900 1.90 0.35 3.80 0.50 7.50 0.90
900 1000 2.00 0.40 4.20 0.60 8.00 1.00

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