N2318 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 N2318 model number is decoded

N2318 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 90×190×64 mm ISO 15 envelope. Digit by digit, N2318 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 90 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 3,200 r/min grease and 3,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 90 mm bore. Thermal planning around the 3,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,800 r/min for continuously high-duty 90 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2318.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Induction-heat the 90 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 190 mm raceway.
• Grease limiting speed 3,200 r/min and oil 3,800 r/min are different limits for N2318: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
• Do not replace N2318 with a deep-groove ball bearing on rating alone: line contact gives 360 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 360/395 kN pair here belongs to N2318 as printed, not to the bare size.
• If the shaft must be located both ways, do not use N2318 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
• The 360/395 kN ratings, 43.5 kN Pu and 7790 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2318 (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.