30316DU 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 30316DU model number is decoded

The NTN 2203E table prints 30316DU in the large-OD 30300 family with the steeper contact angle: 80 mm bore, 170 mm cup OD, 42.5 mm T, with a grease limiting speed of 2,000 r/min and an oil-lubricated ceiling of 2,700 r/min. The last two digits 16 are the ISO bore code, ×5 = 80 mm (codes 00–03 use the 10/12/15/17 exception table) under the ISO 355 numbering; the 42.5 mm value printed here is T, the width of the fully assembled cone-plus-cup set, not the inner-ring width alone. A tapered roller bearing reacts combined radial and one-direction axial load; NTN mounts 30316DU cone and cup separately and adjusts end play or preload against a second bearing, so the arrangement locates the shaft in both directions. Selection: C 262 kN against C0 283 kN gives a C0/C ratio of 1.08 for the 80 mm bore, and the equivalent combined load must keep below the rating at the target L10 with the pair counted as one unit. With a rotating shaft a k5/m5 shaft seat and a press-fit cup are typical catalogue practice for 30316DU; reverse the logic if the cup rotates, and re-verify against load direction and magnitude.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Mount the 80 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 4170 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 80 mm bore; do not swap to the lighter family without re-checking the 2,000 r/min grease limit and the thrust load split.
• Minimum load matters at high speed: an unloaded 30316DU at a large fraction of 2,000 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
• Never fit the 80 mm cone by hammering the 170 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
• Do not confuse T (42.5 mm assembled width of cone + cup) with the cone width when drawing spacers; an abutment sized to T instead of the ring width leaves the cup unseated.
• The 262/283 kN ratings and 32.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 30316DU (ISO 355 7GB); internal geometry legitimately differs between manufacturers, so re-verify ratings, adjustment and suffix before substituting another make on a rated drive.