NN4964 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 NN4964 model number is decoded

The NTN order number NN4964 denotes a 320×440×118 mm (12.598 × 17.323 × 4.646 in) cylindrical roller bearing in the NN4900 family, a machined or stamped steel cage per the precision execution. Digit by digit, NN4964 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 320 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NN4964 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 242 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 2.17 (2970/1370 kN) shows the high-static-capacity proportioning of this 320 mm bore. Heat the inner ring to max 120 °C for the 320 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

• At 320 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 49000 g NN4964 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 320 mm inner ring.
• The 60.0 mm section at 320 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 118 mm-wide cavity.
• Do not replace NN4964 with a deep-groove ball bearing on rating alone: line contact gives 1370 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
• Do not replace NN4964 with a deep-groove ball bearing on rating alone: line contact gives 1370 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
• The 1370/2970 kN ratings, 242 kN Pu and 49000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4964 (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.