NN4964K 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 NN4964K model number is decoded

NN4964K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 320×440×118 mm ISO 15 envelope. Digit by digit, NN4964K 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. At 1,400 r/min with oil versus 1,200 r/min with grease (a 200 r/min band), lubrication choice for NN4964K is a thermal decision, not just a sealing one. Rating life at 1370 kN C assumes clean oil and adequate film; the 242 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. 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 46700 g NN4964K ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• Do not replace NN4964K 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 EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1370/2970 kN pair here belongs to NN4964K as printed, not to the bare size.
• Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 440 mm race brinells and releases as vibration within hours.
• Grease limiting speed 1,200 r/min and oil 1,400 r/min are different limits for NN4964K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
• The 1370/2970 kN ratings, 242 kN Pu and 46700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4964K (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.