SKF LUND 20-2LS - Linear Ball Bearing

SKF LUND 20-2LS - Linear Ball Bearing Unit with Housing, 20 mm Shaft

SKF LUND 20-2LS is a complete linear ball bearing unit designed for a nominal shaft diameter of 20 mm. Manufactured by SKF, it belongs to the LUND series and consists of a closed housing containing a self-aligning linear ball bearing. The 2LS execution features two double-lip seals. The unit enables linear motion along a shaft, accommodates minor alignment deviations and provides a relubrication facility.

Technical Specifications - SKF LUND 20-2LS

These specifications refer to the earlier SKF LUND 20-2LS execution. They must not automatically be applied to the LUND 20 D-2LS variant.

What Does SKF LUND 20-2LS Mean?

SKF - Manufacturer of the linear bearing unit.

LUND - SKF series of closed-housing linear bearing units incorporating self-aligning linear ball bearings.

20 - Nominal diameter of the compatible shaft, 20 mm.

2LS - Two double-lip seals positioned on opposite sides of the linear bearing.

The designation identifies a complete bearing unit with housing, rather than an individual linear ball bearing.

Construction of SKF LUND 20-2LS

The unit consists of a closed housing containing a linear ball bearing.

Recirculating rolling elements enable the unit to move along a guiding shaft.

The self-aligning bearing construction accommodates minor alignment deviations within the linear guidance system.

The closed housing surrounds the bearing and provides mounting points for attachment to the machine structure.

Unlike open linear bearing units, the LUND closed-housing design is intended for use with a continuous round shaft.

Dimensions and Mounting Arrangement

SKF LUND 20-2LS is designed for a nominal shaft diameter of 20 mm.

Its principal mounting dimensions are:

• Housing length A: 45 mm.

• Housing width Da: 32 mm.

• Shaft centre height H: 25 mm.

• Overall height H1: 50 mm.

• Overall length L: 60 mm.

• Mounting hole spacing J: 45 mm.

• Mounting hole spacing J1: 32 mm.

• Mounting: M8 screws.

When replacing a linear bearing unit, the shaft diameter alone is not sufficient to establish interchangeability.

The shaft centre height, housing dimensions and mounting hole spacing must also be checked.

2LS Double-Lip Seals

The SKF LUND 20-2LS execution incorporates two double-lip seals.

Their principal functions are:

• Limiting the entry of contaminants into the bearing.

• Helping retain lubricant within the bearing assembly.

The seals interact with the shaft surface during linear movement.

However, double-lip sealing does not provide complete protection under every environmental condition.

In applications involving heavy dust, liquids or aggressive contaminants, additional protection of the linear guidance system may be necessary.

Self-Aligning Linear Bearing Design

The LUND unit incorporates a self-aligning linear ball bearing.

This design helps accommodate minor alignment deviations between the shaft and bearing housing.

It does not eliminate the need for accurate installation and correct guide alignment.

Excessive misalignment can result in increased friction, uneven load distribution and premature bearing wear.

The shaft and housing should therefore be installed according to the applicable SKF mounting recommendations.

Load Ratings - SKF LUND 20-2LS

For the catalogue execution SKF LUND 20-2LS, the manufacturer specifies:

Basic dynamic load rating C: 2,000 N.

Basic static load rating C0: 1,370 N.

The dynamic load rating is used when calculating bearing fatigue life under operating conditions involving movement.

The static load rating is used to assess loading conditions in which permanent deformation at rolling element contact points must be considered.

These catalogue values do not represent the maximum permissible load under every operating condition.

Correct selection requires consideration of load direction, lubrication, temporary peak loads and required service life.

SKF LUND 20-2LS vs SKF LUND 20 D-2LS

Both units are designed for a nominal shaft diameter of 20 mm.

However, SKF catalogue data identify differences in their load ratings and mass.

For the D execution, the load rating depends on the direction of the applied load.

Before substitution, verify the complete product designation, loading requirements and mounting compatibility.

Matching principal mounting dimensions do not automatically establish identical operating characteristics.

Typical Applications

SKF LUND linear ball bearing units are used in mechanical systems requiring guided linear motion.

Typical applications of this bearing design include:

• Industrial machinery.

• Linear transfer systems.

• Industrial automation equipment.

• Sliding mechanisms.

• Production equipment guide assemblies.

• Positioning systems.

These are general applications associated with the bearing design, not confirmed original equipment applications for this specific SKF product number.

Bearing Selection and Interchangeability

Before purchasing or replacing the unit, verify:

• Complete SKF designation.

• Nominal shaft diameter of 20 mm.

• Housing dimensions.

• Shaft centre height.

• Mounting hole spacing.

• Linear bearing construction.

• Seal configuration.

• Dynamic and static load ratings.

• Lubrication requirements.

• Required service life.

Linear bearing units designed for the same nominal shaft diameter do not necessarily have identical mounting dimensions or load ratings.

The SKF LUND 20-2LS and LUND 20 D-2LS executions should therefore be evaluated separately.

Mounting and Maintenance

Before installation, inspect the guiding shaft and housing mounting surfaces.

The shaft must be correctly selected with respect to diameter, tolerance, hardness and surface finish.

Mount the housing without introducing unwanted stresses into the bearing assembly.

Ensure correct alignment of the linear guides and provide suitable lubrication.

The LUND bearing unit incorporates a relubrication facility.

The lubricant type and maintenance intervals should be selected according to the actual operating conditions.

During operation, inspect the smoothness of linear movement, seal condition and cleanliness of the shaft.

FAQ

What is SKF LUND 20-2LS?

SKF LUND 20-2LS is a complete linear ball bearing unit with a closed housing, designed for a nominal shaft diameter of 20 mm.

What does 2LS mean?

The suffix 2LS identifies two double-lip seals positioned on opposite sides of the linear bearing.

Is SKF LUND 20-2LS self-aligning?

Yes. The unit incorporates a self-aligning linear ball bearing designed to accommodate minor alignment deviations.

What shaft diameter does SKF LUND 20-2LS require?

The nominal guiding shaft diameter is 20 mm.

What are the mounting dimensions?

The overall length is 60 mm, the shaft centre height is 25 mm and the principal mounting hole spacing is 45 mm.

Can SKF LUND 20-2LS be relubricated?

Yes. The unit includes a facility for relubrication.

Are SKF LUND 20-2LS and LUND 20 D-2LS identical?

No. They have similar principal mounting dimensions, but SKF specifies different load ratings and catalogue masses. Interchangeability must be verified.

Is SKF LUND 20-2LS a rotary bearing?

No. It is a linear bearing unit designed to provide straight-line movement along a shaft.

SKF LUND 20-2LS - Key Information

SKF LUND 20-2LS is a closed-housing linear ball bearing unit designed for a 20 mm shaft. It features a self-aligning bearing, two double-lip seals and a relubrication facility. Overall length is 60 mm and shaft centre height is 25 mm. The basic dynamic load rating is 2,000 N and the static load rating is 1,370 N. It should not be confused with LUND 20 D-2LS.

SKF linear motion bearing units are offered by the specialist industrial supplier simmering.pl. Stock in Poland, worldwide shipping and technical assistance with identifying the correct SKF bearing execution.