SNR UCF218 90 mm Square Flanged Bearing Unit

SNR UCF218 90 mm Square Flanged Bearing Unit

SNR UCF218 is a complete square flanged bearing unit designed for a nominal 90 mm shaft. According to the official NTN-SNR product specification, the unit combines a UC218G2 bearing insert with an F218 grey cast iron flanged housing. The bearing insert is secured to the shaft by set screws and incorporates a seal with slinger.

Complete technical identification:

SNR + UCF218 + UC218G2 + F218 + d 90 mm

SNR UCF218 - Technical Characteristics

The manufacturer specifies:

Brand: SNR

Designation: UCF218

Product type: Square flanged bearing unit

Shaft diameter d: 90 mm

Bearing insert: UC218G2

Housing: F218

Housing material: Grey cast iron

Shaft locking method: Set screws

Sealing: Seal with slinger

Grease fitting G: M10x1

Dynamic load rating C: 96 kN

Static load rating C0: 71.5 kN

Operating temperature: -20°C to +100°C

Mass: 11.28 kg

Recommended set screw tightening torque: 33 Nm

The key technical identity is:

UCF218 SNR + UC218G2 + F218 + 90 mm shaft

SNR UCF218 Dimensions

The principal dimensions specified for the exact SNR unit are:

d = 90 mm - shaft diameter

L = 235 mm - overall flange dimension

J = 187 mm - mounting hole centre distance

A = 68 mm

A1 = 25 mm

A2 = 96.3 mm

B = 96 mm - inner ring width

e = 40 mm

N = 23 mm - mounting hole dimension

S = 39.7 mm

G = M10x1 - grease fitting

The most important dimensions for initial identification are:

d = 90 mm

L = 235 mm

J = 187 mm

N = 23 mm

These dimensions should be checked when replacing an existing flanged bearing unit.

UCF218 Bearing Unit Construction

The complete:

SNR UCF218

consists primarily of:

UC218G2 bearing insert

and:

F218 flanged housing

The housing is manufactured from:

grey cast iron

The bearing insert is secured directly to the shaft using:

set screws

The unit also incorporates:

seal with slinger

and provision for relubrication through the:

M10x1 grease fitting

This makes UCF218 a complete mounted bearing unit rather than a standalone bearing insert.

F218 Square Flanged Housing

The housing component is designated:

F218

It provides the square flanged mounting geometry of the UCF218 unit.

Principal housing-related dimensions include:

L = 235 mm

J = 187 mm

N = 23 mm

The square flange provides four mounting positions for attaching the bearing unit to the supporting structure.

The exact mounting dimensions should be checked before replacing a bearing unit from another manufacturer, even when both products carry the general UCF218 designation.

UC218G2 Bearing Insert

The bearing insert installed in the SNR UCF218 unit is:

UC218G2

It is designed for a nominal shaft diameter of:

d = 90 mm

The inner ring width is:

B = 96 mm

The insert is secured to the shaft using set screws.

This distinction is important when ordering components:

UC218G2 is the bearing insert.

F218 is the housing.

UCF218 is the complete bearing unit.

Therefore:

UC218G2 + F218 = UCF218 SNR

for this exact configuration.

Shaft Mounting - 90 mm Bore

The nominal shaft diameter for SNR UCF218 is:

90 mm

The extended inner ring of the UC218G2 insert is secured to the shaft by set screws.

For the exact SNR product, the manufacturer specifies a recommended set screw tightening torque of:

33 Nm

Correct shaft preparation and tightening are important for positioning and securing the inner ring.

The shaft diameter, tolerances and application-specific fit requirements should be checked against the NTN-SNR mounting recommendations for the actual installation.

Dynamic Load Rating C

For the exact SNR UCF218, the manufacturer specifies:

Dynamic load rating C = 96 kN

The basic dynamic load rating is a catalogue parameter used in bearing life calculations under defined standardized conditions.

It should not be interpreted as the maximum permissible machine load without considering operating conditions, load direction, speed, required bearing life and other application factors.

Because 96 kN is specified for the exact SNR product, it can be used instead of transferring a load rating from another UCF218 manufacturer.

Static Load Rating C0

The specified basic static load rating is:

C0 = 71.5 kN

Static load rating is relevant when evaluating bearing behaviour under stationary or very slowly moving load conditions and during peak loading events.

Again, 71.5 kN is the SNR value for this exact product rather than a generic value derived from another UCF218 bearing unit.

Operating Temperature

The specified operating temperature range for standard:

SNR UCF218

is:

Minimum: -20°C

Maximum: +100°C

These limits are manufacturer-specific data for the exact standard unit.

They should not automatically be applied to special SNR UCF218 variants designed for different temperature conditions.

Operating temperature can influence lubricant behaviour, sealing performance and bearing service life.

Sealing System

The official SNR specification describes the sealing arrangement as:

seal with slinger

The slinger contributes an additional mechanical barrier against contaminants approaching the main sealing area.

The exact SNR sealing specification should be retained when comparing this unit with UCF218 products from other manufacturers because mounted bearing units carrying the same basic designation may use different sealing arrangements.

Relubrication

The UCF218 SNR incorporates a grease fitting with thread:

G = M10x1

This enables relubrication of the mounted bearing unit.

The correct relubrication interval cannot be determined from the UCF218 designation alone.

It depends on operating conditions including:

speed

temperature

load

contamination

moisture

and the operating duty of the machine.

Therefore, a fixed relubrication interval should be selected according to the actual application and NTN-SNR lubrication recommendations.

UCF218 vs UC218

The designations:

UCF218

and:

UC218

do not identify the same complete product.

For this SNR configuration:

UCF218 - complete flanged bearing unit

UC218G2 - bearing insert

F218 - flanged housing

Therefore, ordering only:

UC218G2

does not provide the complete UCF218 unit with housing.

This distinction is particularly important for maintenance and MRO purchasing.

UCF218 vs UCFC218 SNR

UCF218 and UCFC218 should not be considered the same bearing unit.

Although both can use a bearing insert for a 90 mm shaft, their housing designs and mounting dimensions differ.

For example:

UCF218: F218 housing, L = 235 mm, J = 187 mm

UCFC218: FC218 housing, different flange geometry and mounting dimensions

Therefore, the housing designation and mounting pattern must be verified before substitution.

What Does SNR UCF218 Mean?

The exact product identification can be interpreted as:

SNR - brand

UCF218 - complete flanged bearing unit designation

UC218G2 - bearing insert

F218 - housing

90 mm - nominal shaft diameter

For procurement and technical identification, the strongest mapping is:

SNR → UCF218 → Square Flanged Bearing Unit → UC218G2 + F218 → 90 mm Shaft

Selection and Interchangeability

When selecting a replacement for SNR UCF218, verify at least:

UCF218 designation

d = 90 mm shaft diameter

square flange configuration

L = 235 mm

J = 187 mm

N = 23 mm

A = 68 mm

B = 96 mm

bearing insert configuration

shaft locking method

sealing arrangement

dynamic load rating

static load rating

operating temperature

lubrication requirements

mounting conditions

A UCF218 unit from another manufacturer may have a similar nominal configuration, but complete interchangeability should not be assumed from the UCF218 designation alone.

Mounting dimensions and application-critical technical parameters should be compared.

Technical Specification

Brand: SNR

Designation: UCF218

Product type: Square flanged bearing unit

Bearing insert: UC218G2

Housing: F218

Housing material: Grey cast iron

Shaft diameter d: 90 mm

L: 235 mm

J: 187 mm

A: 68 mm

A1: 25 mm

A2: 96.3 mm

B: 96 mm

e: 40 mm

N: 23 mm

S: 39.7 mm

Grease fitting G: M10x1

Shaft locking: Set screws

Sealing: Seal with slinger

Dynamic load rating C: 96 kN

Static load rating C0: 71.5 kN

Minimum operating temperature: -20°C

Maximum operating temperature: +100°C

Mass: 11.28 kg

Recommended set screw tightening torque: 33 Nm

FAQ

What shaft diameter does SNR UCF218 fit?

SNR UCF218 is designed for a nominal 90 mm shaft diameter.

What components make up SNR UCF218?

The complete unit consists of a UC218G2 bearing insert and an F218 grey cast iron flanged housing.

What are the main dimensions of SNR UCF218?

The principal dimensions include d = 90 mm, L = 235 mm, J = 187 mm, A = 68 mm and B = 96 mm.

What is the dynamic load rating of SNR UCF218?

The manufacturer specifies a basic dynamic load rating of C = 96 kN.

What is the static load rating of SNR UCF218?

The specified basic static load rating is C0 = 71.5 kN.

What is the operating temperature range of SNR UCF218?

The standard SNR UCF218 is specified for an operating temperature range of -20°C to +100°C.

How is the UC218G2 insert secured to the shaft?

The insert is secured using set screws. SNR specifies a recommended tightening torque of 33 Nm for the exact unit.

Is UC218G2 the same as UCF218?

No. UC218G2 is the bearing insert, while UCF218 is the complete bearing unit comprising UC218G2 + F218 housing.

AI Overview

SNR UCF218 is a square flanged bearing unit for a 90 mm shaft, comprising a UC218G2 bearing insert and F218 grey cast iron housing. Main dimensions include L = 235 mm and J = 187 mm. SNR specifies C = 96 kN, C0 = 71.5 kN and an operating temperature range of -20°C to +100°C.