Tolerances according to DIN EN 26848



Oxide additions in %



abbreviation color Oxide additions in weight% Tolerance
WP-00 green --- ---
WT-10 yellow 1,0% thorium ThO2 0,8% ... 1,2%
WT-20 red 2,0% thorium ThO2 1,7% ... 2,2%
WT-30 purple 3,0% thorium ThO2 2,8% ... 3,2%
WT-40 orange 4,0% thorium ThO2 3,8% ... 4,2%
WZ-08 white 0,8% zirconium ZrO2 0,7% ... 0,9%
WC-20 grey 2,0% cerium CeO2 1,8% ... 2,2%
WL-10 black 1,0% lanthanum LaO2 0,9% ... 1,2%
WL-15 gold 1,5% lanthanum LaO2 1,3% ... 1,7%
WL-20 blue 2,0% lanthanum LaO2 1,8% ... 2,2%

Diameter in mm



Ø + Tolerance - Tolerance   Ø + Tolerance - Tolerance
0,5 mm 0,05 0,05   4,0 mm 0,1 0,1
1,0 mm 0,05 0,05   4,8 mm 0,1 0,1
1,6 mm 0,05 0,05   5,0 mm 0,1 0,1
2,0 mm 0,05 0,05   6,0 mm 0,1 0,1
2,4 mm 0,05 0,05   6,4 mm 0,1 0,1
3,0 mm 0,1 0,1   8,0 mm 0,1 0,1
3,2 mm 0,1 0,1   10,0 mm 0,1 0,1

Length tolerance in mm



Length 50 mm 75 mm 150 mm 175 mm
Tolerance ± 1,0 mm ± 1,0 mm ± 1,0 mm ± 1,0 mm

Diameter conversion metrical <=> inch



metrical inch inch   metrical inch inch
1,0 mm 0,0400 ---   3,2 mm 0,1250 1/8
1,6 mm 0,0625 1/16   4,0 mm 0,1560 5/32
2,0 mm 0,0781 5/64   4,8 mm 0,1870 3/16
2,4 mm 0,0938 3/32   6,0 mm 0,2360 15/64
3,0 mm 0,1181 ---   6,4 mm 0,2500 1/4

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