L45449-L45410 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (NTN 2203E 2026-09-25) · extracted 2026-10-01

Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN 2203E 2026-09-25); 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 L45449-L45410 model number is decoded

The NTN 2203E inch table prints 4T-L45449/L45410 at 29 mm bore (1.142 in), 50.292 mm cup OD and 14.224 mm assembled T, with a grease limiting speed of 7,200 r/min and an oil ceiling of 9,600 r/min. The 4T prefix is NTN's tapered roller quality mark stamped on both parts; it is a brand mark, not a size code, so cross-references quote L45449/L45410 without it. The 10.6 mm radial section over the 29 mm bore positions the contact line of the pair; abutment shoulders and spacers are dimensioned from that geometry, not from the bore alone. Housing fitment sequence for 4T-L45449/L45410: press the L45410 cup square into the 50.292 mm seat first, then bring the L45449 cone (on its 29 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Minimum load matters at speed: an unloaded 4T-L45449/L45410 run near 7,200 r/min lets the rollers skid; lightly spring-preload high-speed pair arrangements.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Hub and pinion positions of this 29 mm class are adjusted in pairs; verify end play against the axle or gearbox drawing and re-torque after bedding-in instead of trusting the first setting on 4T-L45449/L45410.
• The light L family at 29 mm bore (50.292×14.224 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full L45449/L45410 reference at purchase.
• Replacing one half of an adjusted pair without resetting end play negates the 14.224 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
• Replacing one half of an adjusted pair without resetting end play negates the 14.224 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
• Inch and metric bores collide on paper — 29 mm is 1.142 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
• The 31/35.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-L45449/L45410; internal geometry legitimately differs between inch-series makers, so re-verify ratings, adjustment and the exact cone/cup references before substituting another brand on a rated drive.