Printer Friendly Version These rollers can be supplied with two types of ends, either "Flat head" (form B) or "Tallow drop head (form A).
Tolerances
Quality Diameter Tolerance D Selection Groups D Max Circularity Error (µ) Max Roughness Max (Ra µ)
G2 0-10µ 0.8 0.1
G3 0-10µ 1.2 0.1
G5 0-10µ 2 0.15
Needle rollers can be supplied with:
  • diameter selected in groups of 1µ
  • tighter values of length tolerances and possibly also with ground planes
  • a "ZB" or controlled contour profile, as specified below
Most Common Sizes of Needle Rollers
D 4.8 5.8 6.8 7.8 9.8 11.8 13.8 15.8 17.8 19.8 21 21.8 23.8 25 27.8 28 29.8 30 32 34.8 35.5 39.8 41 43.8 49.8 59.8
1
1.5
2
2.5
3
3.5
4
5
6
7