NU315-NTN 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 NU315-NTN model number is decoded

NTN lists NU315 on the 75×160 mm envelope, 37 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 4,400 r/min. Numbering ties NU315 to its envelope: type code NU, series NU300, 75 mm bore; the 160×37 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU315. Mass 3210 g for the 75×160×37 mm NU315 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NU 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

• Induction-heat the 75 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 160 mm raceway.
• Do not replace NU315 with a deep-groove ball bearing on rating alone: line contact gives 211 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 37 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 75 mm inner ring.
• The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 211/205 kN pair here belongs to NU315 as printed, not to the bare size.
• Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 160 mm race brinells and releases as vibration within hours.
• The 211/205 kN ratings, 23.8 kN Pu and 3210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU315 (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.