NU1088 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 NU1088 model number is decoded

For pure radial duty on a 440 mm shaft NTN supplies NU1088: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 900 r/min on grease and 1,100 r/min on oil. Digit by digit, NU1088 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 440 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 105.0 mm radial section ((650−440)/2) frames the roller complement; capacity per millimetre of bore is about 3.6 kN/mm before application factors. Mass 103000 g for the 440×650×94 mm NU1088 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU1088 non-locating position preloads the bearing when the shaft grows.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 440 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 103000 g NU1088 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 650 mm race brinells and releases as vibration within hours.
• Open NU1088 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 440 mm contact.
• If the shaft must be located both ways, do not use NU1088 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
• The 105.0 mm section at 440 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 94 mm-wide cavity.
• The 1590/2430 kN ratings, 178 kN Pu and 103000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1088 (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.