81213-TN bearing: complete specifications & equivalents
The 81213-TN is a ISO 104 radial bearing sized 65 x 100 x 27 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 65 mm |
| Outer diameter D | 100 mm |
| Width B | 27 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 140 kN |
| Basic static load rating C0 | 490 kN |
| Fatigue load limit Pu | 50 kN |
| Reference speed (thermal) | 1300 rpm |
| Limiting speed (mechanical) | 2600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 720 g |
| Manufacturer designation | 81213 TN |
| Standard | ISO 104 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 81200-series range
| Bore d | 2.559 in |
|---|---|
| Outer diameter D | 3.937 in |
| Width B | 1.063 in |
| ISO bore code | 13 |
| Radial section height (D−d)/2 | 17.5 mm |
| Smallest bore in 81200-series | 30 mm |
| Largest outer diameter in 81200-series | 420 mm |
| Width range across 81200-series | 16–95 mm |
| Bore position in 81200-series (smallest first) | 8 of 28 |
| Bore above smallest 81200-series size | 35 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 81213-TN model number is decoded
The heavy 812 series bearing 81213 TN carries pure axial load at low to moderate speed: 140 kN dynamic and 490 kN static across a 65×100 mm washer pair, 27 mm overall height. Reading the code: the first three digits 812 give the dimension series (heavy 812 series), the last two 13 encode the 65 mm shaft washer bore (code 13 × 5), and TN names the cage execution. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.019. The 720 g mass and 27 mm axial height sit between 65 and 100 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: locate the shaft washer on the 65 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 100 mm bore, and check the stack can tilt freely before clamping.
Typical equipment & failure modes
Common applications
- extruder and injection press screw thrust blocks at low speed
- rolling-mill screwdown mechanisms and press adjusters
- slewing and turntable pivots with predominantly axial force
- crane hook crossheads carrying pure hook thrust while the hook swivels
Known failure patterns
- smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established
- washer back-face fretting where the seat is too narrow to support the full ring face
- grease churning and overheating when a high-speed thrust position is over-packed
- rolling-contact fatigue spalling after the catalogue L10 life is exhausted
- cage wear from rollers being dragged through unloaded zones under fluctuating thrust
Selection pitfalls — read before you substitute
- At 65 mm bore the minimum load (A 0.019) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.
- The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81213 TN size.
- the 1,300 r/min reference speed is the thermal criterion under load, the 2,600 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.
- Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.
- Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81213 TN need different minimum load and lubrication despite the shared 65×100 mm outline.
- The 140/490 kN ratings and 720 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only.
Frequently asked questions
Can a thrust ball bearing replace the 81213 TN?
They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting.
What ruins a 81213 TN in service?
Unloaded running below factor A 0.019 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 2,600 r/min limiting.
Which dimensions does the 81213 TN have?
A 81213 TN measures 65 mm bore × 100 mm outside diameter × 27 mm width (2.559 × 3.937 × 1.063 in). From SKF catalogue PUB BU/P1 17000: dynamic C 140 kN, static C0 490 kN, fatigue limit Pu 50 kN, reference speed 1,300 r/min, limiting speed 2,600 r/min, mass about 720 g. Raceway diameters Ea 69 mm / Eb 96 mm and minimum load factor A 0.019 guide the seat design.
What is the difference between 811 and 812 series?
811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81213 TN belongs to the heavy 812 series, 65×100×27 mm.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings on 2026-09-27. Read our editorial & correction policy.