NF405 bearing: complete specifications & equivalents
The NF405 is a ISO 15 radial bearing sized 25 x 80 x 21 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 25 mm |
| Outer diameter D | 80 mm |
| Width B | 21 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 51.5 kN |
| Basic static load rating C0 | 40 kN |
| Fatigue load limit Pu | 4.85 kN |
| Limiting speed (mechanical) | 8500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 536 g |
| Manufacturer designation | NTN NF405 |
| 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 & NF400-series range
| Bore d | 0.984 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 0.827 in |
| ISO bore code | 05 |
| Radial section height (D−d)/2 | 27.5 mm |
| Smallest bore in NF400-series | 25 mm |
| Largest outer diameter in NF400-series | 200 mm |
| Width range across NF400-series | 21–48 mm |
| Bore position in NF400-series (smallest first) | 1 of 12 |
| Bore above smallest NF400-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NF405 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 NF405 model number is decoded
The NTN order number NF405 denotes a 25×80×21 mm (0.984 × 3.15 × 0.827 in) cylindrical roller bearing in the NF400 family, a pressed sheet-steel cage. Numbering ties NF405 to its envelope: type code NF, series NF400, 25 mm bore; the 80×21 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 8,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 10,000 r/min for continuously high-duty 25 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF405 non-locating position preloads the bearing when the shaft grows.
Typical equipment & failure modes
Common applications
- agricultural PTO and implement gear shafts
- small conveyor and fan rotor positions
- small electric-motor armature shafts
- light gearbox layshaft and pinion positions
Known failure patterns
- inner-ring raceway spalling from overload in the line-contact Hertzian zone
- pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant
- micro-pitting when the EHL film falls below the composite roughness at high specific load
- false brinelling on standby machines exposed to external vibration
- edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit
Selection pitfalls — read before you substitute
- Small 25 mm-bore cylindrical rollers are skid-sensitive: ensure the radial load exceeds the minimum-load floor at operating speed, or the NF405 rollers smear even with correct grease.
- Grease limiting speed 8,500 r/min and oil 10,000 r/min are different limits for NF405: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- Wide (22/23) and light (10/49) executions at 25 mm bore share bore but not OD/width; check the full NF400 series code before substituting, because housing and shoulder geometry will not interchange.
- If the shaft must be located both ways, do not use NF405 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
- The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 51.5/40 kN pair here belongs to NF405 as printed, not to the bare size.
- The 51.5/40 kN ratings, 4.85 kN Pu and 536 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF405 (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 NF405?
NF405 is an NTN NF single-row cylindrical roller bearing to ISO 15: 25 mm bore, 80 mm OD and 21 mm width (0.984 × 3.15 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 51.5 kN, C0 40 kN, Pu 4.85 kN, grease limiting speed 8,500 r/min, oil 10,000 r/min, mass about 536 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. NF405 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position.
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. NF405 is supplied in the standard open execution shown in the table.
Can NF405 take axial load and locate a shaft?
the NF design gives one-direction axial guidance via its single outer-ring rib. 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 NF405?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 38.8 mm, Ew 62.8 mm. The nominal bore/OD remain 25/80 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,500 r/min grease / 10,000 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.