NUP1008 bearing: complete specifications & equivalents
The NUP1008 is a ISO 15 radial bearing sized 40 x 68 x 15 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 40 mm |
| Outer diameter D | 68 mm |
| Width B | 15 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 30.5 kN |
| Basic static load rating C0 | 29 kN |
| Fatigue load limit Pu | 3.55 kN |
| Limiting speed (mechanical) | 11000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 217 g |
| Manufacturer designation | NTN NUP1008 |
| 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 & NUP1000-series range
| Bore d | 1.575 in |
|---|---|
| Outer diameter D | 2.677 in |
| Width B | 0.591 in |
| ISO bore code | 08 |
| Radial section height (D−d)/2 | 14 mm |
| Smallest bore in NUP1000-series | 25 mm |
| Largest outer diameter in NUP1000-series | 720 mm |
| Width range across NUP1000-series | 12–100 mm |
| Bore position in NUP1000-series (smallest first) | 4 of 42 |
| Bore above smallest NUP1000-series size | 15 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NUP1008 | 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 NUP1008 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, NUP1008 appears as a 40 mm bore single-row cylindrical roller bearing (30.5 kN C / 29 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 40 mm, with 68 mm OD and 15 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 47 mm and Ew 61 mm — the envelope inside the 40/68 mm bore/OD where the rollers actually run. Thermal planning around the 11,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 13,000 r/min for continuously high-duty 40 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 40 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.
Typical equipment & failure modes
Common applications
- fan and blower rotor positions
- industrial gearbox input and output shafts
- medium electric-motor and generator shafts
- pump and compressor crankshafts and rotors
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
- rolling-contact fatigue after the catalogue L10 life is exceeded
- edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit
Selection pitfalls — read before you substitute
- On this 40 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP1008.
- Grease limiting speed 11,000 r/min and oil 13,000 r/min are different limits for NUP1008: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 68 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 30.5/29 kN pair here belongs to NUP1008 as printed, not to the bare size.
- The NUP rib arrangement is not interchangeable with another prefix on the same 40 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 68×15 mm envelope matches.
- The 30.5/29 kN ratings, 3.55 kN Pu and 217 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1008 (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 NUP1008?
NUP1008 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 40 mm bore, 68 mm OD and 15 mm width (1.575 × 2.677 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 30.5 kN, C0 29 kN, Pu 3.55 kN, grease limiting speed 11,000 r/min, oil 13,000 r/min, mass about 217 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. NUP1008 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions.
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. NUP1008 is supplied in the standard open execution shown in the table.
Can NUP1008 take axial load and locate a shaft?
the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing.
What do Fw and Ew mean for NUP1008?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 47 mm, Ew 61 mm. The nominal bore/OD remain 40/68 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 11,000 r/min grease / 13,000 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.