NN3009 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01

Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.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 NN3009 model number is decoded

NTN lists NN3009 on the 45×75 mm envelope, 23 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 8,800 r/min. Digit by digit, NN3009 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 45 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NN3009 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 405 g for the 45×75×23 mm NN3009 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 45 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3009.
• The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 57.5/68.5 kN pair here belongs to NN3009 as printed, not to the bare size.
• Grease limiting speed 8,800 r/min and oil 10,000 r/min are different limits for NN3009: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
• Do not replace NN3009 with a deep-groove ball bearing on rating alone: line contact gives 57.5 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
• Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.
• The 57.5/68.5 kN ratings, 8.35 kN Pu and 405 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3009 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives.