NATR-17 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 15 support rollers / ch. 16 cam followers) · extracted 2026-09-30

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 15 support rollers / ch. 16 cam followers); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the NATR-17 model number is decoded

the 40 mm outside diameter runs on the track while the 17 mm bore takes the pin or shaft; the 21 mm overall width spreads the Hertzian contact over the outer ring published ratings C 10.5 kN and C0 14.6 kN already include the bending-stress correction for the unsupported outer ring — the C/C0 ratio of 0.72 is typical for support roller with flange rings, with inner ring executions fatigue load limit Pu 1.73 kN at 17 mm bore gives a specific load of 0.62 kN per mm; the limiting speed is 3,400 r/min the 21 mm width carries the load at 0.50 kN per mm of roller complement; section height 11.5 mm between bore and track surface determines the outer-ring bending stiffness mass 140 g over a 40x21 mm envelope works out to 0.167 g per mm² of projected area — a useful figure when sizing the drive inertia for medium-speed cam duty the 17 mm bore falls in the small-size band, the most common choice for general-purpose cam followers and light conveyor transfer rollers reading NATR: needle roller support roller with integral flange rings; the 40 mm outer ring runs on the track while the flanges keep the roller centred without separate thrust washers typical applications include glass processing line conveyors, linear guide and track systems and robotic arm track guidance this size is commonly specified for glass processing line conveyors and linear guide and track systems, where the 40 mm track diameter and 17 mm bore fit standard cam and rail geometries in robotic arm track guidance the 40 mm outer ring provides the rolling contact while the inner ring bore simplifies mounting; the 140 g mass is low enough for rapid indexing cycles the flanges reduce the available track width by their own thickness; check the cam channel width against the B dimension, not just the outer ring width cage guidance (NATR) is less tolerant of shock than full complement (NATV); heavy impact can crack the cage and release rollers into the mechanism

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• the pressed-on flange rings are not designed for continuous axial load — side thrust from a skewed track will eventually dislodge them
• the flanges reduce the available track width by their own thickness; check the cam channel width against the B dimension, not just the outer ring width
• cage guidance (NATR) is less tolerant of shock than full complement (NATV); heavy impact can crack the cage and release rollers into the mechanism