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Outside Diameter
O/D Range+-
3mm up to 6mm 0.00 0.12
over 6mm up to 10mm0.15
over 10mm up to 18mm0.18
over 18mm up to 30mm0.21
over 30mm up to 50mm0.25
over 50mm up to 80mm0.30
over 80mm up to 120mm0.35
over 120mm up to 180mm0.40
over 180mm up to 250mm0.46
over 250mm up to 315mm0.52
over 315mm up to 400mm0.57
over 400mm up to 500mm0.63
over 500mm up to 600mm0.68
Inside Diameter
I/D Range+-
3mm up to 6mm0.120.00
over 6mm up to 10mm0.15
over 10mm up to 18mm0.18
over 18mm up to 30mm0.21
over 30mm up to 50mm0.25
over 50mm up to 80mm0.30
over 80mm up to 120mm0.35
over 120mm up to 180mm0.40
over 180mm up to 250mm0.46
over 250mm up to 315mm0.52
over 315mm up to 400mm0.57
over 400mm up to 500mm0.63
over 500mm up to 600mm0.68
Concentricity of Diameters
O/D RangeTol.DIN
3mm up to 6mm0.152.IT 11
over 6mm up to 10mm0.18
over 10mm up to 18mm0.22
over 18mm up to 30mm0.26
over 30mm up to 50mm0.32
over 50mm up to 80mm0.602.IT 12
over 80mm up to 120mm0.70
over 120mm up to 180mm0.80
over 180mm up to 250mm0.92
over 250mm up to 315mm1.04
over 315mm up to 400mm1.14
over 400mm up to 500mm1.26
over 500mm up to 600mm1.36

Spring Force Tolerance
GroupThickness RangeGroup force deviation at test height lo - 0.75ho
+-
1under 1.25mm25%7.5%
21.25mm up to 3.00mm15%7.5%
over 3.00mm up to 6.00mm10%5%
3over 6.00mm up to 14.00mm5%5%
Thickness
GroupThickness Range+-
10.20mm up to 0.60mm0.020.06
over 0.60mm to under 1.25mm0.030.09
21.25mm up to 3.80mm0.040.12
over 3.80mm up to 6.00mm0.050.15
3over 6.00mm up to 14.00mm0.100.10

Overall Height
GroupThickness Range+-
1under 1.25mm0.100.05
21.25mm up to 2.00mm0.150.08
over 2.00mm up to 3.00mm0.200.10
over 3.00mm up to 6.00mm0.300.15
3over 6.00mm up to 14.00mm0.300.30
Guide Clearance
Outside or Inside DiameterTotal Clearance
up to 16mm0.20
over 16mm up to 20mm0.30
over 20mm up to 26mm0.40
over 26mm up to 31.5mm0.50
over 31.5mm up to 50mm0.60
over 50mm up to 80mm0.80
over 80mm up to 140mm1.00
over 140mm up to 250mm1.60
Institute of Spring TechnologyMember of UK Spring Manufacturers AssociationBelleville QualityBritish Valve and Actuator Association

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