Broomfield
Carbide Gauges Ltd.

Tolerances for Used Gauge Blocks
BS4311: PART3: 1993

Tolerances: New Gauges

Tolerances: Used Gauges

Old Specifications

Set Compositions: Metric

Set Compositions: Imperial

Metric

Nominal Length Tolerances of deviation of measured central length from nominal at 20oC Maximum associated uncertainty of measurement Tolerances on variation of measured length
Greater than Less than or equal to Grade
0 1 2 3 4 0, 1 & 2 3 4 0 1 2 3 4
Unit (mm) Unit 0.001mm (1µm)
0 10 ±0.12 ±0.25 ±0.50 +0.50
-1.00
+0.50
-2.00
±0.08 ±0.08 ±0.10 0.10 0.16 0.30 0.40 0.50
10 25 ±0.15 ±0.30 ±0.60 +0.60
-1.20
+0.60
-2.40
±0.10 ±0.10 ±0.13 0.10 0.16 0.30 0.40 0.50
25 50 ±0.20 ±0.40 ±0.80 +0.80
-1.60
+0.80
-3.20
±0.12 ±0.12 ±0.17 0.10 0.18 0.30 0.40 0.50
50 75 ±0.25 ±0.50 ±1.00 +1.00
-2.00
+1.00
-4.00
±0.15 ±0.15 ±0.21 0.12 0.18 0.35 0.40 0.50
75 100 ±0.30 ±0.60 ±1.20 +1.20
-2.40
+1.20
-4.80
±0.18 ±0.18 ±0.25 0.12 0.20 0.35 0.40 0.50




Inch

Nominal Length Tolerances of deviation of measured central length from nominal at 20oC Maximum associated uncertainty of measurement Tolerances on variation of measured length
Greater than Less than or equal to Grade
0 1 2 3 4 0, 1 & 2 3 4 0 1 2 3 4
Unit ( in ) Unit 0.001 in (1µ in )
0 0.4 ± 5 ±10 ±20 +20
-40
+20
-80
±3 ±4 ±6 4 6 12 16 20
0.4 1 ±6 ±12 ±25 +25
-50
+25
-100
±4 ±5 ±8 4 6 12 16 20
1 2 ±8 ±15 ±30 +30
-60
+30
-120
±5 ±6 ±10 4 7 12 16 20
2 3 ±10 ±20 ±40 +40
-80
+40
-160
±6 ±8 ±12 5 7 14 16 20
3 4 ±12 ±25 ±50 +50
-100
+50
-200
±7 ±10 ±14 5 8 14 16 20

UKAS Certification
0103

Broomfield Carbide Gauges Ltd., Brigg Mills, 3 The Cobbles, Meltham, Holmfirth HD9 5QQ
Tel: +44 (0) 1484 665599        Fax: +44 (0) 844 5046692        e-mail: enquiry@broomfieldgauges.com

Gauge and Tool Makers Association