NN3048 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 NN3048 model number is decoded

NN3048 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 945 kN dynamic rating in the 240 mm bore. Numbering ties NN3048 to its envelope: type code NN, series NN3000, 240 mm bore; the 360×92 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 NN3048 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 945 kN C assumes clean oil and adequate film; the 140 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 240 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 32800 g NN3048 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• The 60.0 mm section at 240 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 92 mm-wide cavity.
• Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.
• Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.
• Do not replace NN3048 with a deep-groove ball bearing on rating alone: line contact gives 945 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 945/1600 kN ratings, 140 kN Pu and 32800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3048 (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.