389-382A 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 389-382A model number is decoded

4T-389/382A belongs to the NTN inch 4T tapered roller range (pure-numeric inch family); cone and cup are ordered by their own references and are individually interchangeable with like-numbered parts. 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 389/382A without it. The 20.6 mm radial section over the 55.575 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-389/382A: press the 382A cup square into the 96.838 mm seat first, then bring the 389 cone (on its 55.575 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Running clearance of 4T-389/382A is set at mounting by axial displacement of cone or cup — the catalogue does not ship a preloaded set, so the drawing must state end play or preload.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Mount the 55.575 mm cone by induction heating (max 120 °C) and the 96.838 mm cup with a press sleeve; at 606 g a cocked ring brinells the raceway directly.
• The pure-numeric inch family at 55.575 mm bore (96.838×21 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 389/382A reference at purchase.
• Replacing one half of an adjusted pair without resetting end play negates the 21 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
• An unloaded 4T-389/382A near 3,700 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
• Replacing one half of an adjusted pair without resetting end play negates the 21 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
• The 86.5/96.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-389/382A; 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.