NJ1026 bearing: complete specifications & equivalents
The NJ1026 is a ISO 15 radial bearing sized 130 x 200 x 33 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 130 mm |
| Outer diameter D | 200 mm |
| Width B | 33 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 191 kN |
| Basic static load rating C0 | 238 kN |
| Fatigue load limit Pu | 24.9 kN |
| Limiting speed (mechanical) | 3400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3630 g |
| Manufacturer designation | NTN NJ1026 |
| Standard | ISO 15 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
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.
Dimensions in inches & NJ1000-series range
| Bore d | 5.118 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 1.299 in |
| ISO bore code | 26 |
| Radial section height (D−d)/2 | 35 mm |
| Smallest bore in NJ1000-series | 25 mm |
| Largest outer diameter in NJ1000-series | 720 mm |
| Width range across NJ1000-series | 12–100 mm |
| Bore position in NJ1000-series (smallest first) | 20 of 42 |
| Bore above smallest NJ1000-series size | 105 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NJ1026-ML | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 130×200×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
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 NJ1026 model number is decoded
NTN lists NJ1026 on the 130×200 mm envelope, 33 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,400 r/min. Digit by digit, NJ1026 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 4,000 r/min with oil versus 3,400 r/min with grease (a 600 r/min band), lubrication choice for NJ1026 is a thermal decision, not just a sealing one. The 130 mm (5.118 in) bore and 200 mm (7.874 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 33 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 130 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.
Typical equipment & failure modes
Common applications
- wind-turbine gearbox planet and rotor shafts
- ship propulsion line shafts and reduction gears
- mining SAG/ball-mill drive shafts
- offshore drawworks and winch drums
Known failure patterns
- inner-ring raceway spalling from overload in the line-contact Hertzian zone
- cage distortion after a mounting blow carried through the roller set
- micro-pitting when the EHL film falls below the composite roughness at high specific load
- brinelling from static overload or impact during handling
- brinelling from static overload or impact during handling
Selection pitfalls — read before you substitute
- At 130 mm bore, oil-lubricated arrangements toward 4,000 r/min need positive flow and drain design; the 3630 g NJ1026 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.
- Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1026 skids at 3,400 r/min and fails by smearing long before L10 fatigue.
- The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 191/238 kN pair here belongs to NJ1026 as printed, not to the bare size.
- Grease limiting speed 3,400 r/min and oil 4,000 r/min are different limits for NJ1026: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- The 191/238 kN ratings, 24.9 kN Pu and 3630 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1026 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives.
Frequently asked questions
What are the dimensions and catalogue data of NJ1026?
NJ1026 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 33 mm width (5.118 × 7.874 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 238 kN, Pu 24.9 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 3630 g. It is open, with a pressed sheet-steel cage.
What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?
The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1026 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction.
What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?
EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1026 is supplied in the standard open execution shown in the table.
Can NJ1026 take axial load and locate a shaft?
the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings.
What do Fw and Ew mean for NJ1026?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 148 mm, Ew 182 mm. The nominal bore/OD remain 130/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.