NU1026 bearing: complete specifications & equivalents
The NU1026 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 NU1026 |
| 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 & NU1000-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 NU1000-series | 25 mm |
| Largest outer diameter in NU1000-series | 1090 mm |
| Width range across NU1000-series | 12–150 mm |
| Bore position in NU1000-series (smallest first) | 20 of 47 |
| Bore above smallest NU1000-series size | 105 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NU1026-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 NU1026 model number is decoded
The NTN order number NU1026 denotes a 130×200×33 mm (5.118 × 7.874 × 1.299 in) cylindrical roller bearing in the NU1000 family, a pressed sheet-steel cage. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1026 floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 148 mm and Ew 182 mm — the envelope inside the 130/200 mm bore/OD where the rollers actually run. Thermal planning around the 3,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 4,000 r/min for continuously high-duty 130 mm positions. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.
Typical equipment & failure modes
Common applications
- offshore drawworks and winch drums
- heavy press and large gearbox main shafts
- rolling-mill work-roll and backup-roll positions
- large turbine and generator rotor bearings
Known failure patterns
- roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load
- 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
- electrical pitting on VFD-driven motor shafts without grounding protection
- 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 NU1026 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.
- Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.
- 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 NU1026 as printed, not to the bare size.
- The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 200×33 mm envelope matches.
- The 191/238 kN ratings, 24.9 kN Pu and 3630 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1026 (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 NU1026?
NU1026 is an NTN NU 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. NU1026 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially.
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. NU1026 is supplied in the standard open execution shown in the table.
Can NU1026 take axial load and locate a shaft?
the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set).
What do Fw and Ew mean for NU1026?
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.