Page 950 - Rollingbearings

15 Support rollers

Bearing data

Dimension • (R)NA 22 designs
standards ISO 15, dimension series 22, except for the outer ring width
15
• NATR, NATV, NUTR ‥ A, PWTR designs
ISO 7063 and ANSI/ABMA Standard 18 1 (where standardized)

• (R)STO designs
Not standardized

Proile of the • (R)STO, (R)NA 22, NATR, NATV designs
outer ring running Radius = 500 mm
surface
• NNTR design
D ≤ 260 mm † Radius = 10 000 mm
D ≥ 290 mm † Radius = 15 000 mm

• NATR ‥ PPA, NATV ‥ PPA, NUTR ‥ A, PWTR designs
Improved crowned proile for better load distribution, higher stiffness and reduced wear

Tolerances Normal, except:
• diameter of the crowned running surface:
– NNTR design † h10
– other designs † 0/–0,05 mm
• width B:
– NNTR design † 0/–0,5 mm
– NATR, NATV, NUTR ‥ A, PWTR designs † h12
• inside diameter F :
w
– RSTO, RNA 22 designs † F6
For additional
information Values for Normal tolerance class: ISO 492 (table 2, page 38)
† page 35 Values for ISO tolerance classes: h10, h12 and F6 (table 2, page 950)

Internal clearance • STO and NA 22 designs
Normal

• Other designs
Between C2 and Normal
For additional
information Values: ISO 5753-1 (table 11, page 603)
† page 182 Values are valid for unmounted bearings under zero measuring load

Defect frequencies † skf com/bearingcalculator

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