81107-TN bearing: complete specifications & equivalents
The 81107-TN is a ISO 104 radial bearing sized 35 x 52 x 12 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 35 mm |
| Outer diameter D | 52 mm |
| Width B | 12 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 29 kN |
| Basic static load rating C0 | 93 kN |
| Fatigue load limit Pu | 9.15 kN |
| Reference speed (thermal) | 2800 rpm |
| Limiting speed (mechanical) | 5600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 73 g |
| Manufacturer designation | 81107 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 & 81100-series range
| Bore d | 1.378 in |
|---|---|
| Outer diameter D | 2.047 in |
| Width B | 0.472 in |
| ISO bore code | 07 |
| Radial section height (D−d)/2 | 8.5 mm |
| Smallest bore in 81100-series | 15 mm |
| Largest outer diameter in 81100-series | 400 mm |
| Width range across 81100-series | 9–63 mm |
| Bore position in 81100-series (smallest first) | 6 of 34 |
| Bore above smallest 81100-series size | 20 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 81107-TN model number is decoded
81107 TN is the rigid-washer thrust solution for a 35 mm shaft: unlike ball thrust types, the line contact of cylindrical rollers gives 29 kN C within just 12 mm of axial space, per the ISO 104 plan. Reading the code: the first three digits 811 give the dimension series (light 811 series), the last two 07 encode the 35 mm shaft washer bore (code 07 × 5), and TN names the cage execution. Small sizes ship with glass-fibre PA66 TN cages for quiet, low-friction running; the 29 kN rating assumes oil or grease reaching the full washer face. Static safety matters for shock duty: compare peak axial force against C0 93 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 6.90e-4) is present without clamping the rollers.
Typical equipment & failure modes
Common applications
- 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
- screw jack and lifting screw thrust positions under slow, steady load
Known failure patterns
- cage wear from rollers being dragged through unloaded zones under fluctuating thrust
- washer back-face fretting where the seat is too narrow to support the full ring face
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
- brinelling of washer raceways from impact or mounting force applied through the rolling elements
- roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)
Selection pitfalls — read before you substitute
- At a 35 mm seat the 12 mm stack is easy to over-clamp — a cover torqued solid removes all roller clearance; shim to the catalogue endplay and keep factor A 6.90e-4 as the floor.
- 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 81107 TN need different minimum load and lubrication despite the shared 35×52 mm outline.
- the 2,800 r/min reference speed is the thermal criterion under load, the 5,600 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.
- The 29/93 kN ratings assume flat, full-support washer seats; a housing face narrower than the 52 mm washer OD invalidates the rating through edge stress.
- The 29/93 kN ratings and 73 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
What ruins a 81107 TN in service?
Unloaded running below factor A 6.90e-4 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 5,600 r/min limiting.
Which dimensions does the 81107 TN have?
A 81107 TN measures 35 mm bore × 52 mm outside diameter × 12 mm width (1.378 × 2.047 × 0.472 in). From SKF catalogue PUB BU/P1 17000: dynamic C 29 kN, static C0 93 kN, fatigue limit Pu 9.15 kN, reference speed 2,800 r/min, limiting speed 5,600 r/min, mass about 73 g. Raceway diameters Ea 36 mm / Eb 51 mm and minimum load factor A 6.90e-4 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. 81107 TN belongs to the light 811 series, 35×52×12 mm.
Are the washers of 81107 TN separable?
Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height.
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.