NN3072 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 NN3072 model number is decoded

NTN lists NN3072 on the 360×540 mm envelope, 134 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 1,000 r/min. Numbering ties NN3072 to its envelope: type code NN, series NN3000, 360 mm bore; the 540×134 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NN3072 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,000 r/min is .83 of the 1,200 r/min oil value for NN3072; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 360 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 360 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 107000 g NN3072 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• The NN rib arrangement is not interchangeable with another prefix on the same 360 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 540×134 mm envelope matches.
• The 134 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 360 mm inner ring.
• Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3072 does not substitute a precision-class execution.
• Do not replace NN3072 with a deep-groove ball bearing on rating alone: line contact gives 1830 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 1830/3300 kN ratings, 258 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3072 (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.