INA stud type track rollers accuracy and internal clearance

The dimensional and geometrical tolerances correspond to tolerance class PN to DIN 620, for KR(E) and KRV to ISO 7 063.The following deviations from DIN 620 apply:

  • the diameter tolerance of the profiled outside surface 0/–0,05 mm
  • for NNTR, the diameter tolerance to h10
  • for NATR, NATV, NUTR, PWTR..-2RS, the tolerance of the width B to h12
  • for NATR, NATV, the roundness of the inner ring
  • for INA stud type track rollers, the tolerance of the shank diameter h7 and the eccentric collar diameter h9.

For PWTR..-2RS-RR and PWKR..-2RS-RR , the tolerances are increased by the thickness of the Corrotect special coating.

INA stud type track rollers radial internal clearance

The radial internal bearing clearance corresponds approximately to class C2 and in the case of STO and NA22..-2RSR to class CN in accordance with DIN 620-4.

Bore Radial internal clearance
d mm C2 μm CN μm C3 μm C4 μm
over incl. min. max. min. max. min. max. min. max.
- 24 0 25 20 45 35 60 50 75
24 30 0 25 20 45 35 60 50 75
30 40 5 30 25 50 45 70 60 85
40 50 5 35 30 60 50 80 70 100
50 65 10 40 40 70 60 90 80 110
65 80 10 45 40 75 65 100 90 125
80 100 15 50 50 85 75 110 105 140
100 120 15 55 50 90 85 125 125 165
120 140 15 60 60 105 100 145 145 190

Enveloping circle
For RSTO and RNA22..-2RSR, the needle roller enveloping circle Fw is in the tolerance zone F6.
The enveloping circle is the inner inscribed circle of the needle rollers in clearance-free contact with the adjacent construction.



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