81114-TN bearing: complete specifications & equivalents
The 81114-TN is a ISO 104 radial bearing sized 70 x 95 x 18 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 70 mm |
| Outer diameter D | 95 mm |
| Width B | 18 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 86.5 kN |
| Basic static load rating C0 | 345 kN |
| Fatigue load limit Pu | 34.5 kN |
| Reference speed (thermal) | 1700 rpm |
| Limiting speed (mechanical) | 3400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 330 g |
| Manufacturer designation | 81114 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 | 2.756 in |
|---|---|
| Outer diameter D | 3.74 in |
| Width B | 0.709 in |
| ISO bore code | 14 |
| Radial section height (D−d)/2 | 12.5 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) | 13 of 34 |
| Bore above smallest 81100-series size | 55 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 81114-TN model number is decoded
81114 TN is the rigid-washer thrust solution for a 70 mm shaft: unlike ball thrust types, the line contact of cylindrical rollers gives 86.5 kN C within just 18 mm of axial space, per the ISO 104 plan. In 81114 TN, 811 fixes the 95 mm OD and 18 mm height; 14 selects the 70 mm seat, and the glass fibre reinforced PA66 TN cage is the only execution suffix on these rigid-washer bearings. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. Static safety matters for shock duty: compare peak axial force against C0 345 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: locate the shaft washer on the 70 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 95 mm bore, and check the stack can tilt freely before clamping.
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
- roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)
- housing-washer rotation scored into an unmachined or loose seating face
- abrasive paste forming as dust bypasses the housing seals into the open washer set
- rolling-contact fatigue spalling after the catalogue L10 life is exhausted
- smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established
Selection pitfalls — read before you substitute
- At 70 mm bore the minimum load (A 0.0095) 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.
- Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81114 TN need different minimum load and lubrication despite the shared 70×95 mm outline.
- 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 81114 TN size.
- the 1,700 r/min reference speed is the thermal criterion under load, the 3,400 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.
- The 86.5/345 kN ratings assume flat, full-support washer seats; a housing face narrower than the 95 mm washer OD invalidates the rating through edge stress.
- The 86.5/345 kN ratings and 330 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 are the dimensions and ratings of the 81114 TN?
A 81114 TN measures 70 mm bore × 95 mm outside diameter × 18 mm width (2.756 × 3.74 × 0.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 86.5 kN, static C0 345 kN, fatigue limit Pu 34.5 kN, reference speed 1,700 r/min, limiting speed 3,400 r/min, mass about 330 g. Raceway diameters Ea 72 mm / Eb 92 mm and minimum load factor A 0.0095 guide the seat design.
How is the 81114 TN designation read?
The first three digits 811 give the dimension series (light 811 series); 14 encodes the 70 mm bore (code 14 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately.
Why does 81114 TN need a minimum axial load?
Below factor A 0.0095 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts.
Can the 81114 TN take reversing thrust?
No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load.
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.