SNR UKF216H 70 mm Flange Bearing Unit with Adapter Sleeve

What Is the SNR UKF216H?

SNR UKF216H is a self-aligning flange bearing unit for a 70 mm shaft, consisting of a radial insert ball bearing mounted in a robust grey cast iron flange housing. The bearing is secured to the shaft using an adapter sleeve and features sealing with an external slinger. The UKF design provides a compact, ready-to-install bearing arrangement for industrial machinery, conveyors and maintenance applications. The SNR catalogue confirms a 70 mm shaft diameter for UKF216H.

Technical Specifications

Manufacturer: SNR

Designation: UKF216H

Product type: Flange bearing unit

Bearing type: Self-aligning radial insert ball bearing

Housing: Flange housing

Housing material: Grey cast iron

Shaft diameter d: 70 mm

Shaft locking: Adapter sleeve

Bearing bore: Tapered, 1:12

Radial internal clearance: C3

Sealing: Double-sided sealing with external slinger

Housing dimension L: 208 mm

Mounting hole distance J: 165 mm

Housing height A: 57 mm

Flange height A1: 22 mm

Overall height A2: 73 mm

Mounting hole diameter N: 23 mm

Overall inner ring width B1: 78 mm

Distance s1: 39 mm

Grease fitting: M10x1

The principal housing dimensions correspond to the official SNR UKF216H catalogue data.

Load Ratings

The SNR UKF216H bearing unit has the following load ratings:

Basic dynamic load rating C: 72.5 kN

Basic static load rating C0: 54.2 kN

These values correspond to the SNR UK216 insert bearing family used in the UKF216H flange unit.

Operating Temperature

SNR specifies the following operating temperature range for this bearing unit family:

Minimum operating temperature: -20°C

Maximum operating temperature: +100°C

Actual permissible operating conditions also depend on load, rotational speed, lubrication, contamination and installation.

What Does UKF216H Mean?

The designation identifies the main construction characteristics of the unit.

UK: Radial insert bearing with tapered bore for adapter sleeve mounting

F: Flange housing

216: Bearing and housing size

H: Adapter sleeve mounting execution

Unlike a UC bearing insert secured directly to the shaft with set screws, the UK design uses a tapered bore and adapter sleeve.

Adapter Sleeve Mounting

A key characteristic of SNR UKF216H is the adapter sleeve mounting system.

The tapered bearing bore and adapter sleeve provide mechanical clamping of the bearing inner ring onto the shaft. For the metric 70 mm UKF216H execution, the associated adapter sleeve is H2316. This is also confirmed by SNR for other UK216H units using the 70 mm metric shaft execution.

This construction differs fundamentally from the UCF216, which uses a UC216 insert secured directly to the shaft by socket set screws.

C3 Radial Internal Clearance

The UKF216H execution is specified with C3 radial internal clearance, meaning clearance greater than Normal.

This is particularly relevant because mounting a tapered-bore bearing on an adapter sleeve reduces its internal clearance as the bearing is driven onto the taper.

The required mounting procedure and resulting operating clearance should therefore be considered during installation.

Flange Housing Dimensions

The SNR catalogue specifies the following main dimensions for UKF216H:

Shaft diameter d: 70 mm

Housing dimension L: 208 mm

Mounting hole spacing J: 165 mm

Housing height A: 57 mm

Flange height A1: 22 mm

Overall height A2: 73 mm

Mounting hole N: 23 mm

Distance s1: 39 mm

Overall inner ring width B1: 78 mm

These dimensions are important when replacing an existing flange bearing unit because the shaft diameter alone does not determine housing compatibility.

Sealing System

SNR UK bearing inserts use a sealing arrangement designed to protect the rolling elements and lubricant from external contamination.

The UKF216H is specified with double-sided lip sealing combined with external slinger protection. The slinger provides an additional mechanical barrier against contaminants reaching the sealing lip.

This construction is particularly useful in industrial bearing arrangements exposed to dust and general contamination.

Grey Cast Iron Housing

The F216 flange housing is manufactured from grey cast iron. SNR uses cast housings for its standard industrial self-aligning bearing unit range.

The flange construction provides a rigid mounting interface and allows the complete bearing unit to be attached directly to a machine frame, support plate or equipment housing.

Self-Aligning Bearing Unit Design

The insert bearing has a spherical outside surface that works with the corresponding spherical seating in the housing.

This arrangement allows the bearing unit to compensate for a limited amount of initial shaft-to-housing misalignment.

This self-aligning capability is one of the principal functional characteristics of mounted insert bearing units and simplifies installation in many industrial machine designs.

UKF216H vs UCF216

Both units use the same F216 flange housing size, but their shaft mounting systems differ.

UKF216H: UK insert bearing with tapered bore and adapter sleeve, 70 mm shaft

UCF216: UC insert bearing with set-screw locking, 80 mm shaft

The standard SNR UCF216 has an 80 mm bore and uses socket set screws for shaft locking.

Therefore, UCF216 and UKF216H should not be considered equivalent units despite sharing the F216 housing family.

Typical Applications

SNR UKF216H flange bearing units can be used in appropriately designed:

• conveyor systems,
• material handling equipment,
• agricultural machinery,
• production machinery,
• industrial drives,
• processing equipment,
• mechanical transmission systems,
• maintenance and replacement applications.

Final selection should account for shaft diameter, load, rotational speed, operating temperature, mounting conditions and environmental contamination.

How to Select an SNR UKF216H Replacement

When selecting a replacement, verify:

Manufacturer: SNR

Designation: UKF216H

Shaft diameter: 70 mm

Housing: F216 flange housing

Housing material: Grey cast iron

Mounting: Adapter sleeve

Adapter sleeve: H2316

Internal clearance: C3

Housing dimension: 208 mm

Mounting hole spacing: 165 mm

Mounting hole diameter: 23 mm

A standard UCF216 is not a direct equivalent because it uses a different bearing insert, shaft diameter and locking method.

FAQ - Technical Questions

What shaft diameter is SNR UKF216H designed for?
The metric UKF216H is designed for a 70 mm shaft.

What are the main housing dimensions?
The housing measures 208 mm across, with 165 mm mounting-hole spacing and 23 mm mounting holes.

What is the dynamic load rating?
The basic dynamic load rating C is 72.5 kN.

What is the static load rating?
The basic static load rating C0 is 54.2 kN.

Does UKF216H use set screws?
No. The UKF216H uses a tapered bore and adapter sleeve for shaft mounting.

Frequently Asked Questions from Maintenance Engineers

Which adapter sleeve is used with UKF216H 70 mm?
The metric 70 mm execution uses an H2316 adapter sleeve.

Does UKF216H have C3 clearance?
Yes. The UKF216H execution is specified with C3 radial internal clearance.

Can UCF216 replace UKF216H?
Not directly. SNR UCF216 has an 80 mm shaft diameter and set-screw locking, while UKF216H uses an adapter sleeve on a 70 mm shaft.

Can the bearing unit be relubricated?
Yes. The F216 housing incorporates an M10x1 grease fitting for relubrication.

What is the operating temperature range?
SNR specifies -20°C to +100°C for this bearing unit family.