7001-NTN bearing: complete specifications & equivalents
The 7001-NTN is a ISO 15 radial bearing sized 12 x 28 x 8 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 12 mm |
| Outer diameter D | 28 mm |
| Width B | 8 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 5.6 kN |
| Basic static load rating C0 | 2.46 kN |
| Fatigue load limit Pu | 0.19 kN |
| Limiting speed (mechanical) | 26000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 25 g |
| Manufacturer designation | NTN 7001 |
| 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 & 7000-series range
| Bore d | 0.472 in |
|---|---|
| Outer diameter D | 1.102 in |
| Width B | 0.315 in |
| ISO bore code | 01 |
| Radial section height (D−d)/2 | 8 mm |
| Smallest bore in 7000-series | 10 mm |
| Largest outer diameter in 7000-series | 420 mm |
| Width range across 7000-series | 8–65 mm |
| Bore position in 7000-series (smallest first) | 2 of 36 |
| Bore above smallest 7000-series size | 2 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 7001 | GENERIC-ISO | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per 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 7001-NTN model number is decoded
At 12 x 28 x 8 mm, NTN 7001 sits in the standard-section 7000 single-row family of the angular-contact programme. Decoding 7001: 70 is the single-row dimension series (standard-section 7000 single-row family), with 01 encodes the 12 mm bore (bore code x 5); with no letter after the digits it is the standard 30 deg contact-angle execution — the 40 deg version carries a B. The oil rating of 35,000 r/min sits 9,000 r/min above the 26,000 r/min grease figure — a 1.35x step that says how much headroom oil cooling buys. Size selection is usually finished by checking that the C0 of 2.46 kN covers the maximum static or shock condition with the catalogue safety factor, not only the running load. After mounting, check axial float or preload with a dial gauge on the shaft end — the specification, not hand feel, decides whether the contact angle works as rated.
Typical equipment & failure modes
Common applications
- small pump and compressor shafts with combined load
- servo and stepper motor shafts with axial preload
- bicycle and motorcycle wheel and steering positions
- small gearbox pinion shafts with helical gears
Known failure patterns
- false brinelling on the raceway contact ellipses when a preloaded spindle sits vibrating at standstill — visible as evenly spaced flute-like wear at ball pitch
- thermal runaway from excessive preload: the pair runs hot, grease darkens and the contact ellipse spreads until the raceways smear
- machined-cage land scoring when a high-speed spindle runs past its grease rating and the cage runs dry on its guidance surface
- contamination-induced denting — hard particles rolled into the contact ellipse become the initiation points for surface fatigue
- current-erosion pitting on VFD-driven motor shafts, first visible as a grey frosted band across both raceways
Selection pitfalls — read before you substitute
- At 12 mm bore the rings are thin-sectioned: press force must go through the ring being fitted, never through the balls, or the first damage is already in the raceway before the machine runs.
- The standard 30 deg bearing and its B (40 deg) sibling share the envelope; picking between them is a load-direction decision, not a quality upgrade.
- A single-row angular contact left loose on the shaft to "help assembly" will fret the seat: the contact angle keeps driving the ring axially under load.
- A 7001 mounted the wrong way round still turns smoothly by hand; the failure shows up weeks later as raceway flaking on the unloaded-looking side.
- Grease rated for deep-groove motor duty is not automatically right at 26,000 r/min with preload; check the grease speed factor against the catalogue figure.
- The 5.6/2.46 kN ratings and 0.19 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 7001; internal geometry legitimately differs between manufacturers, so re-verify ratings, contact angle and suffix before substituting another make on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 7001?
7001 is a single-row angular contact ball bearing to ISO 15: 12 mm bore, 28 mm outside diameter, 8 mm width (0.472 x 1.102 x 0.315 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5.6 kN, C0 2.46 kN and a 0.19 kN fatigue load limit Pu; the grease limiting speed is 26,000 r/min and the oil rating 35,000 r/min; mass about 25 g.
How is the 7001 designation structured?
70 is the single-row dimension series (standard-section 7000 single-row family); 01 encodes the 12 mm bore (bore code x 5); with no letter after the digits it is the standard 30 deg contact-angle execution — the 40 deg version carries a B. The 28 mm OD and 8 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 7001 support?
One 7001 alone takes thrust in one direction only, along its 30 deg contact angle; reversing thrust calls for a second bearing or a factory-matched DB/DF/DT pair (the catalogue right-hand columns list the paired ratings). Radial load is always carried as a combined load through the angled contact.
What lubrication speeds does NTN print for 7001?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 26,000 r/min and the oil rating 35,000 r/min. These are catalogue ceilings for a correctly mounted bearing with the stated lubricant; preload, fill quantity, ambient heat and paired arrangements all move the real limit.
What should be checked before substituting another make for 7001?
The 12/28/8 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 5.6 kN / C0 2.46 kN, the speed figures, contact angle and suffix meaning against the donor catalogue before swapping on a rated drive.
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.