NN3012 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 NN3012 model number is decoded

The NTN order number NN3012 denotes a 60×95×26 mm (2.362 × 3.74 × 1.024 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. Digit by digit, NN3012 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 60 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 7,900 r/min with oil versus 6,700 r/min with grease (a 1,200 r/min band), lubrication choice for NN3012 is a thermal decision, not just a sealing one. Rating life at 78.5 kN C assumes clean oil and adequate film; the 12.4 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NN3012; an oversized radius locks the ring on its face and tilts the 26 mm-wide seat.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Induction-heat the 60 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 95 mm raceway.
• Wide (22/23) and light (10/49) executions at 60 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 60 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.
• Open NN3012 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 60 mm contact.
• Grease limiting speed 6,700 r/min and oil 7,900 r/min are different limits for NN3012: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
• The 78.5/102 kN ratings, 12.4 kN Pu and 704 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3012 (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.