Broomfield
Carbide Gauges Ltd.

Tolerances for New Gauge Blocks
EN ISO 3650:1998

Tolerances: New Gauges

Tolerances: Used Gauges

Old Specifications

Set Compositions: Metric

Set Compositions: Imperial

Metric

Nominal Length
ln
mm
Calibration grade K Grade 0 Grade 1 Grade 2
Greater than Less than or equal to limit deviation of length at any point from nominal length
± te
µm
tolerance for the variation in length
tv
µm
limit deviation of length at any point from nominal length
± te
µm
tolerance for the variation in length
tv
µm
limit deviation of length at any point from nominal length
± te
µm
tolerance for the variation in length
tv
µm
limit deviation of length at any point from nominal length
± te
µm
tolerance for the variation in length
tv
µm
0,5 10 0,2 0,05 0,12 0,1 0,2 0,16 0,45 0,3
10 25 0,3 0,05 0,14 0,1 0,3 0,16 0,6 0,3
25 50 0,4 0,06 0,2 0,1 0,4 0,18 0,8 0,3
50 75 0,5 0,06 0,25 0,12 0,5 0,18 1 0,35
75 100 0,6 0,07 0,3 0,12 0,6 0,2 1,2 0,35

This specification does cover larger gauges but we only manufacture up to 100mm
 

Flatness tolerance tf
Nominal length, ln
mm
Flatness tolerance, tf
µm
Grade
Greater than Less than or equal to K 0 1 2
0,5 150 0,05 0,10 0,15 0,25




Imperial

The above specification using the relationship 1inch = 25.4mm exactly deriving equivalent inch tolerance, rounded with microinch resolution.