30319U 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 30319U model number is decoded

30319U is the NTN 4T catalogue entry for a 95×200×49.5 mm metric tapered roller bearing — separable cone and cup, designed for combined radial and axial load as an individually adjusted bearing. The last two digits 19 are the ISO bore code, ×5 = 95 mm (codes 00–03 use the 10/12/15/17 exception table) under the ISO 355 numbering; the 49.5 mm value printed here is T, the width of the fully assembled cone-plus-cup set, not the inner-ring width alone. Suffix reading on 30319U: U marks the reinforced/uprated internal design of the bare number, a separate order number with higher load capacity than the basic execution; the suffix is part of the order number and the variants are not interchangeable articles. The 4.3 kN-per-mm-bore capacity figure for 30319U summarises the 405 kN rating over 95 mm bore; use it to sanity-check an interchange candidate before swapping brands. After mounting check the contact pattern with marking blue: a pattern biased to the large or small roller end means the 95 mm pair is misadjusted and the 49.5 mm T set will edge-load in service.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Mount the 95 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 6690 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
• The steeper contact angle of the large-OD 30300 family with the steeper contact angle raises axial capacity but lowers the speed ceiling against a 302/322 bearing at 95 mm bore; do not swap to the lighter family without re-checking the 1,900 r/min grease limit and the thrust load split.
• Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 95 mm shoulder geometry, because retrofitting flips the cups.
• Minimum load matters at high speed: an unloaded 30319U at a large fraction of 1,900 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
• ISO 355 makes the 95×200 mm envelope interchangeable but not the ratings: NTN prints 405/445 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
• The 405/445 kN ratings and 48.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 30319U (ISO 355 2GB); internal geometry legitimately differs between manufacturers, so re-verify ratings, adjustment and suffix before substituting another make on a rated drive.