81116-TN bearing: complete specifications & equivalents
The 81116-TN is a ISO 104 radial bearing sized 80 x 105 x 19 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 80 mm |
| Outer diameter D | 105 mm |
| Width B | 19 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 81.5 kN |
| Basic static load rating C0 | 335 kN |
| Fatigue load limit Pu | 34 kN |
| Reference speed (thermal) | 1500 rpm |
| Limiting speed (mechanical) | 3000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 400 g |
| Manufacturer designation | 81116 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 | 3.15 in |
|---|---|
| Outer diameter D | 4.134 in |
| Width B | 0.748 in |
| ISO bore code | 16 |
| 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) | 15 of 34 |
| Bore above smallest 81100-series size | 65 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 81116-TN model number is decoded
In SKF catalogue PUB BU/P1 17000, 81116 TN denotes a cylindrical roller thrust bearing whose rollers run flat on hardened, ground washers — no radial capacity, one axial direction only, and a minimum axial load of factor A 0.009. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81116 TN sits in the light 811 series. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 81.5 kN rating assumes oil or grease reaching the full washer face. The 400 g mass and 19 mm axial height sit between 80 and 105 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 80 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 105 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
- roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)
- shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
- 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 80 mm bore the minimum load (A 0.009) 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 81.5/335 kN ratings assume flat, full-support washer seats; a housing face narrower than the 105 mm washer OD invalidates the rating through edge stress.
- Factor A 0.009 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most "mysterious" early thrust failures are unloaded running.
- Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81116 TN need different minimum load and lubrication despite the shared 80×105 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 81116 TN size.
- The 81.5/335 kN ratings and 400 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); 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
Which dimensions does the 81116 TN have?
A 81116 TN measures 80 mm bore × 105 mm outside diameter × 19 mm width (3.15 × 4.134 × 0.748 in). From SKF catalogue PUB BU/P1 17000: dynamic C 81.5 kN, static C0 335 kN, fatigue limit Pu 34 kN, reference speed 1,500 r/min, limiting speed 3,000 r/min, mass about 400 g. Raceway diameters Ea 83 mm / Eb 102 mm and minimum load factor A 0.009 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. 81116 TN belongs to the light 811 series, 80×105×19 mm.
Are the washers of 81116 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.
Can a thrust ball bearing replace the 81116 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.
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.