99575-99100 bearing: complete specifications & equivalents
The 99575-99100 is a ANSI ABMA 19.2 radial bearing sized 146.05 x 254 x 66.675 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 146.05 mm |
| Outer diameter D | 254 mm |
| Width B | 66.675 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 610 kN |
| Basic static load rating C0 | 910 kN |
| Limiting speed (mechanical) | 1400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 13600 g |
| Manufacturer designation | NTN 4T-99575/99100 |
| Standard | ANSI ABMA 19.2 |
| Catalog version | NTN 2203E 2026-09-25 |
| Last verified | 2026-10-01 |
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.
Dimensions in inches & 4t-inch-series range
| Bore d | 5.75 in |
|---|---|
| Outer diameter D | 10 in |
| Width B | 2.625 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 54 mm |
| Smallest bore in 4t-inch-series | 12.7 mm |
| Largest outer diameter in 4t-inch-series | 260 mm |
| Width range across 4t-inch-series | 10.998–77.788 mm |
| Bore position in 4t-inch-series (smallest first) | 140 of 148 |
| Bore above smallest 4t-inch-series size | 133.35000000000002 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 99575 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 99575-99100 model number is decoded
NTN supplies this 5.75 in (146.05 mm) shaft position as 4T-99575/99100: cone 99575, cup 99100, profiled rollers and a pressed-steel cage, rated 610 kN basic dynamic and 910 kN static. 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 99575/99100 without it. Two single-row inch sets are normally mounted as an adjusted O or X pair; the 66.675 mm T of each 4T-99575/99100 enters the spacer calculation, so the tolerance on assembled width matters as much as the bore fit. Housing fitment sequence for 4T-99575/99100: press the 99100 cup square into the 254 mm seat first, then bring the 99575 cone (on its 146.05 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Back-to-back (O) and face-to-face (X) arrangements of two 4T-99575/99100 sets react differently to shaft bending; choose the orientation for the moment load before locking shoulder geometry.
Typical equipment & failure modes
Common applications
- port-crane travel and hoist gearboxes
- cement-plant mill and kiln drive trains
- large shredder and recycler main shafts
- power-plant coal-mill and fan shafts
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- flaking on one cone only when a bent shaft loads the O/X pair unevenly
- cup creep and housing fretting when the cup seat is cut too loose for the rotating load
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- edge loading when shaft deflection exceeds the few arc-minutes an adjusted pair tolerates
Selection pitfalls — read before you substitute
- At 146.05 mm bore the 4T-99575/99100 set is adjusted with hydraulic nuts or measured shims on mill and crane positions; manual torque methods cannot control preload at the 610 kN C level.
- The pure-numeric inch family at 146.05 mm bore (254×66.675 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 99575/99100 reference at purchase.
- ABMA makes the 146.05×254 mm envelope interchangeable, not the ratings: NTN prints 610/910 kN for this execution and another make of the same number can differ in roller complement.
- Never drive the 254 mm cup home through the rollers: fitting force goes through the ring faces only, or brinell marks release as noise within the first running hours.
- ABMA makes the 146.05×254 mm envelope interchangeable, not the ratings: NTN prints 610/910 kN for this execution and another make of the same number can differ in roller complement.
- The 610/910 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-99575/99100; 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.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 4T-99575/99100?
4T-99575/99100 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 146.05 mm bore (5.75 in), 254 mm outside diameter and 66.675 mm assembled width T (10 × 2.625 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 610 kN, C0 910 kN, grease limiting speed 1,400 r/min, oil speed 1,800 r/min, mass about 13600 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-99575/99100 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 99575 cone or the 99100 cup can be replaced by an identical reference from NTN or another ABMA-dimensioned maker. Pairing the cone with a different cup reference is a different catalogue row: OD, assembled T and the 610/910 kN ratings change with the cup.
What is the difference between 4T-99575/99100 and a metric ISO 355 tapered bearing?
4T-99575/99100 follows the ABMA inch boundary plan with cone/cup references; ISO 355 bearings use metric dimension-series numbers (302, 322, …). Even where a metric size looks close to 146.05×254×66.675 mm, the envelopes and contact angles differ — the two systems are not drop-in interchangeable; check every boundary value before substituting.
What does the 4T prefix on 4T-99575/99100 mean?
4T is NTN's tapered roller bearing quality mark, stamped on cone and cup in the factory. It identifies NTN's 4T programme and is not a dimension or variant code, so interchange lists quote the bare 99575/99100 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-99575/99100 list two speeds, 1,400 and 1,800 r/min?
The lower figure, 1,400 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 4T-99575/99100 at 1,800 r/min because oil removes rib-contact heat better. Real limits still depend on pair adjustment, oil flow and cooling.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN 2203E 2026-09-25 on 2026-10-01. Read our editorial & correction policy.