INA81110-TNAxial Cylindrical Roller Thrust Bearing – 50 mm Bore, 70 mm OD, 14 mm Height, Single Direction, Complete

Product Description

What this part is

INA 81110-TN single-direction axial cylindrical roller thrust bearing, complete. Bore: 50 mm. Outside Diameter: 70 mm. Overall Height: 14 mm. Series: 811. Base Number: 81110. Rolling Elements: Cylindrical rollers. Cage Material: Polyamide. Number Of Rows: 1. Direction: Single. Dynamic Axial Load Rating: 62 kN. Static Axial Load Rating: 177 kN. Limiting Speed: 4,900 rpm. Design Units: Metric. Unit Quantity: 1 Pc. GTIN: 035373019274.

Decoding the designation

811 — the axial cylindrical roller thrust series, comprising a shaft washer, a housing washer and a cage-and-roller assembly.

10 — bore code, 10 x 5 mm, giving a 50 mm bore.

TN — glass-fibre reinforced polyamide cage.

What these specs mean in practice

Cylindrical rollers on a flat washer give line contact rather than point contact, so an 811 thrust bearing carries several times the axial load of a thrust ball bearing on the same envelope. Static Axial Load Rating: 177 kN against a Dynamic Axial Load Rating: 62 kN. Static above dynamic is the normal relationship on this type: the line contact resists indentation far better than it resists the surface fatigue that governs rolling life, and thrust bearings of this kind often spend their life under high static or slow-oscillating load. Limiting Speed: 4,900 rpm. Because the roller runs at a different surface speed at its inner end than its outer end, some sliding is unavoidable at the raceway, which is what caps the speed rating. Cage Material: Polyamide, lighter and quieter than a pressed or machined cage and tolerant of shock loading.

Mounting data

Bore: 50 mm at the shaft washer. Outside Diameter: 70 mm at the housing washer. Overall Height: 14 mm assembled. The bearing takes axial load in one direction only, so it is fitted with the shaft washer against the rotating face and the housing washer against the static face, and an opposing location carries reverse thrust. Both washers need flat, square, fully supported seats across their whole face: a partially supported washer bends and the roller line contact concentrates at one end. Lubricant: grease or oil.

Quantity and configuration

Unit Quantity: 1 Pc. Complete bearing: shaft washer, housing washer and the K81110-TN cage-and-roller assembly together as one unit.

Interchange guidance

81110 is an ISO boundary size for axial cylindrical roller thrust bearings, 50 x 70 x 14 mm. Cross-References: SKF 81110 TN, FAG 81110-TV, NSK 81110, Koyo 81110, NTN 81110. The K81110-TN is the cage-and-roller assembly on its own and the GS81110 and WS81110 are the individual washers, so all three are components of this bearing rather than substitutes for it. The 81110-TV designation is the same bearing with the older Schaeffler cage code. Searchable variants of the manufacturer part number: 81110TN, 81110-TN, 81110 TN, 81110, 81110TV, 240346.