The following tables detail the classes of tolerance that Inglecliff routinely offer to our customers.  These tolerances are based on ISO 3302-1.  Where no tolerances have been requested we will offer Class 2 – Good Quality.  The standard class 2 tolerances are EN2 for Inside diameter, EW2 for Wall width and EC2 for Thickness.

Washer diagram

The following table details tolerances available for ID and OD:

Nominal dimension Inside diameter
Mandrel cured tube
Outside diameter
Surface ground tube
Class EN2 Class EN1 Class EG2 Class EG1
above Up to and including Good Quality High Quality Good Quality High Quality
0 4 0.20 0.20 0.25 0.15
4 6.3 0.25 0.20 0.25 0.15
6.3 10 0.35 0.25 0.25 0.15
10 16 0.40 0.35 0.35 0.20
16 25 0.50 0.40 0.40 0.20
25 40 0.70 0.50 0.50 0.25
40 63 0.80 0.70 0.70 0.35
63 100 1.00 0.80 0.80 0.40
100 160 1.30 1.00 1.00 0.50
160 - 0.80% 0.60% 0.50% 0.30%

The following table details the tolerances for the Thickness and Wall width:

Nominal dimension Thickness Wall width
Class EC3 Class EC2 Class EC1 Class EW2 Class EW1
above Up to and including Non-critical Good Quality High Quality Good Quality High Quality
0.6 1.0 0.20 0.15 0.10 0.20 0.10
1.0 1.6 0.25 0.20 0.10 0.20 0.10
1.6 2.5 0.35 0.20 0.15 0.20 0.10
2.5 4.0 0.40 0.25 0.20 0.20 0.10
4.0 6.3 0.50 0.35 0.20 0.20 0.15
6.3 10.0 0.70 0.40 0.25 0.25 0.20
10.0 16.0 0.80 0.50 0.35 0.35 0.20
16.0 25.0 1.00 0.70 0.40 0.40 0.25