6461-6420 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 6461-6420 model number is decoded

4T-6461/6420 is the NTN 4T catalogue entry for a 76.2×149.225×53.975 mm inch tapered roller bearing — an ABMA-dimensioned cone/cup set, not an ISO 355 metric bearing, even though the table quotes metric equivalents. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: 6461 identifies the cone of 76.2 mm (3 in) bore by catalogue lookup, and 6420 fixes the 149.225 mm OD. Selection: C 320 kN against C0 410 kN gives a C0/C ratio of 1.28 for the 76.2 mm bore; the pair is counted as one adjusted unit when checking L10 at the equivalent combined load. The printed 320/410 kN ratings belong to the assembled 6461+6420 pair; a sibling row using the same cone with a different cup carries its own rating row because the raceway track shifts with the cup. Fillet radii must clear the chamfers of the 6461 cone and 6420 cup; undercut shoulders seat the rings fully instead of bridging on a radius.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Mount the 76.2 mm cone by induction heating (max 120 °C) and the 149.225 mm cup with a press sleeve; at 4260 g a cocked ring brinells the raceway directly.
• The pure-numeric inch family at 76.2 mm bore (149.225×53.975 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 6461/6420 reference at purchase.
• Do not confuse T (53.975 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
• Fit selection follows the rotating ring: a rotating cone on a 76.2 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
• Replacing one half of an adjusted pair without resetting end play negates the 53.975 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
• The 320/410 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-6461/6420; 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.