7912 bearing: complete specifications & equivalents
The 7912 is a ISO 15 radial bearing sized 60 x 85 x 13 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 60 mm |
| Outer diameter D | 85 mm |
| Width B | 13 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 20 kN |
| Basic static load rating C0 | 17.4 kN |
| Fatigue load limit Pu | 1.16 kN |
| Limiting speed (mechanical) | 7800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 230 g |
| Manufacturer designation | NTN 7912 |
| 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 & 7900-series range
| Bore d | 2.362 in |
|---|---|
| Outer diameter D | 3.346 in |
| Width B | 0.512 in |
| ISO bore code | 12 |
| Radial section height (D−d)/2 | 12.5 mm |
| Smallest bore in 7900-series | 25 mm |
| Largest outer diameter in 7900-series | 420 mm |
| Width range across 7900-series | 9–56 mm |
| Bore position in 7900-series (smallest first) | 8 of 32 |
| Bore above smallest 7900-series size | 35 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 7912 | 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 7912 model number is decoded
At 60 x 85 x 13 mm, NTN 7912 sits in the extra-light, high-speed 7900 single-row family of the angular-contact programme. The designation breaks down as 79 is the single-row dimension series (extra-light, high-speed 7900 single-row family); 12 encodes the 60 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 radial section height here is 12.5 mm, and the catalogue couples that with C 20 kN / C0 17.4 kN. For a 60 mm shaft with combined load, the practical shortlist is this series, its 7000-series standard section, and — where thrust reverses — a back-to-back pair rather than a single row. 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
- extruder and mixer gearbox output shafts
- mining conveyor head-shaft positions
- marine auxiliary and winch gearbox shafts
- rolling-mill and metalworking drive shafts
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
- pressed-steel cage pocket wear and rivet loosening after repeated ball skid at light load and high speed
- lubricant starvation scoring at the ball/raceway contact when grease volume or relubrication interval is guessed instead of calculated
- lubricant starvation scoring at the ball/raceway contact when grease volume or relubrication interval is guessed instead of calculated
Selection pitfalls — read before you substitute
- Bearings of 60 mm bore arrive heavy enough that handling damage (dents from slings, tilting on the shaft) is a real failure precursor — use proper lifting and heating kit.
- The 7900 extra-light section is chosen for speed and stiffness, not for load margin — check that C0 17.4 kN really covers the worst static case before substituting it for a 7000.
- Never use a four-point or double-row bearing as a like-for-like swap for a single 7912 without re-checking axial float, heat and housing width — the kinematics differ.
- Catalogue mass and ratings belong to the open execution; shields, seals and resin cages change both the speed ceiling and the thermal behaviour of the same basic size.
- 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.
- The 20/17.4 kN ratings and 1.16 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 7912; 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 7912?
7912 is a single-row angular contact ball bearing to ISO 15: 60 mm bore, 85 mm outside diameter, 13 mm width (2.362 x 3.346 x 0.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 20 kN, C0 17.4 kN and a 1.16 kN fatigue load limit Pu; the grease limiting speed is 7,800 r/min and the oil rating 10,000 r/min; mass about 230 g.
How is the 7912 designation structured?
79 is the single-row dimension series (extra-light, high-speed 7900 single-row family); 12 encodes the 60 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 85 mm OD and 13 mm width follow the ISO 15 boundary-dimension plan for that series.
Which axial direction does 7912 support?
One 7912 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 7912?
Per NTN Ball and Roller Bearings CAT.No.2203E, the grease limiting speed is 7,800 r/min and the oil rating 10,000 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 7912?
The 60/85/13 mm envelope is ISO 15 interchangeable, but internal geometry — contact angle, osculation, cage and shoulder details — is maker-specific. Re-verify C 20 kN / C0 17.4 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.