SRS9 WMUU THK - Miniature Wide Linear Guide Carriage 30x12x39 mm

Product Description

THK SRS9 WMUU is a miniature wide-type ball linear guide carriage manufactured by the Japanese company THK, a specialist in linear motion technology. The SRS9WMUU belongs to the THK SRS series and features a wide carriage body, medium-length configuration and UU sealing arrangement. Its nominal dimensions are 30x12x39 mm (width x height x length).

The carriage incorporates a recirculating ball system designed to provide precise, smooth and repeatable linear movement along a compatible profiled guide rail.

The wide-type configuration provides an enlarged mounting surface compared with corresponding standard-width miniature carriages. This makes the SRS9WMUU suitable for compact machinery, industrial automation, precision positioning mechanisms and measuring equipment.

The model combines compact dimensions, a stainless steel construction, a ball-retaining cage system and end seals to support reliable operation under appropriate installation, lubrication and operating conditions.

The product offered is the THK SRS9WMUU linear guide carriage only. The guide rail is not included.

Technical Specifications - THK SRS9WMUU

The basic load ratings describe catalogue reference values for the SRS9WM configuration. Actual permissible operating loads depend on the application, loading arrangement, required service life and other design conditions.

What Does THK SRS9WMUU Mean?

The product designation identifies the manufacturer, linear guide series, nominal size, carriage construction and sealing configuration.

THK - Japanese manufacturer of precision linear motion components, including profiled linear guides, linear guide carriages and motion control systems.

SRS - miniature linear guide series using recirculating ball technology.

9 - nominal size designation within the THK SRS family.

W - wide-type carriage configuration, providing a larger mounting surface.

M - medium-length carriage version within the SRS9W range.

UU - sealing arrangement with seals at both ends of the carriage.

The complete SRS9WMUU designation provides more precise product identification than the general SRS9W series designation because it specifies both carriage length configuration and sealing.

Construction and Operating Principle

The THK SRS9WMUU linear guide carriage operates using a recirculating ball mechanism.

During linear movement, the balls roll between precisely formed raceways in the carriage and the matching profiled guide rail. The rolling elements transmit loads through the contact zones and subsequently return through internal circulation paths.

This arrangement provides controlled linear movement with relatively low rolling resistance when the carriage is correctly mounted, lubricated and operated within its design limits.

Wide-Type Carriage Body

The W configuration features a wider body than corresponding standard-width miniature linear guide carriages.

The wider mounting platform provides additional space for attaching moving machine components and can support compact assemblies requiring stable guidance.

The wide-type configuration should not be interpreted as providing unlimited moment resistance or load capacity. All applied loads must remain within the manufacturer's design requirements.

Medium-Length M Configuration

The M designation identifies the medium-length carriage configuration.

For the THK SRS9WMUU, the nominal carriage length is 39 mm.

Other carriage lengths are available within the SRS9W family, but they should not automatically be considered interchangeable.

UU End Seals

The UU designation identifies a carriage equipped with sealing elements at both ends.

The seals help reduce the entry of dust and other contaminants into the rolling system while assisting lubricant retention.

They do not make the carriage completely waterproof or suitable for unrestricted operation in heavily contaminated environments.

Recirculating Ball Cage System

The carriage incorporates a ball circulation system with a retaining cage arrangement.

The cage helps maintain the relative positioning of rolling elements during circulation and contributes to consistent operation of the miniature linear guide.

Dimensions and Mounting Geometry

The THK SRS9WMUU has a compact mounting envelope designed for precision linear motion assemblies.

The mounting geometry must be checked against the original machine design before replacing an existing carriage.

A matching guide rail is required for correct operation.

Load Ratings and Load-Carrying Capability

The THK SRS9WM configuration has the following basic catalogue load ratings:

Basic Dynamic Load Rating

The basic dynamic load rating is a catalogue parameter used when calculating the rated life of a linear guide under defined conditions.

It should not be interpreted as the maximum permissible load for every application.

Actual service life depends on operating loads, load distribution, speed, stroke length, lubrication and installation accuracy.

Basic Static Load Rating

The basic static load rating describes the load-related resistance of the rolling contact system under defined static conditions.

The allowable load for a specific machine must also account for safety factors, applied moments and the operating environment.

Four-Direction Load Support

The profiled ball guide construction is designed to accommodate loads acting in multiple directions.

For accurate selection, the complete loading arrangement, including radial loads, reverse radial loads, lateral loads and moments, should be evaluated.

Main Features and Benefits

• Miniature construction for compact linear motion systems.

• Wide-type W carriage body.

• Medium-length M configuration.

• Nominal dimensions of 30x12x39 mm.

• Recirculating ball mechanism.

• Stainless steel construction.

• Ball-retaining cage system.

• UU sealing arrangement.

• Four-direction load-carrying capability.

• Four M3 threaded mounting holes.

• Suitable for precision positioning applications.

• Compatible with the appropriate THK SRS9W guide rail.

THK SRS9WMUU vs Other SRS9W Carriage Variants

The THK SRS9W product family includes different carriage lengths.

The SRS9WMUU belongs to the medium-length configuration.

Different carriage lengths may provide different load ratings, permissible moments and mounting characteristics.

Carriage interchangeability must therefore be verified rather than assumed.

Typical Applications of THK SRS9WMUU

The THK SRS9WMUU is suitable for compact mechanical systems requiring controlled and repeatable linear motion.

Industrial Automation

The carriage can be used in compact automated positioning mechanisms, assembly stations, feeding systems and linear motion axes.

Precision Measuring Equipment

Miniature linear guides are used in mechanisms requiring controlled movement of measuring heads, sensors and other precision components.

Positioning Systems

The SRS9WMUU can support moving components in mechanical positioning and adjustment assemblies.

Laboratory Equipment

Compact linear guides may be incorporated into laboratory mechanisms involving sample positioning, sensor movement and precision adjustment.

Small Industrial Machinery

The carriage is suitable for mechanical assemblies where installation space is limited and profiled linear guidance is required.

Assembly and Inspection Equipment

Recirculating ball linear guides can be used in compact production and inspection mechanisms requiring repeatable movement.

These are representative application categories rather than verified original-equipment applications of a particular SRS9WMUU unit.

Compatible Guide Rail Selection

The THK SRS9WMUU must be used with a compatible THK SRS9W profiled guide rail.

Before selecting a rail, verify:

• THK SRS series compatibility.

• Nominal size 9.

• Wide-type W configuration.

• Raceway geometry.

• Required accuracy class.

• Rail mounting dimensions.

• Rail length and available travel.

• Applied loads and moments.

• Lubrication and environmental requirements.

Not every nominal size 9 linear guide rail is compatible with the THK SRS9WMUU carriage.

Similar external dimensions alone do not guarantee mechanical interchangeability.

Interchangeability and Replacement

When replacing an existing THK SRS9WMUU carriage, the complete product designation should be checked.

Important factors include carriage dimensions, mounting hole arrangement, rail profile, sealing configuration, preload and accuracy class.

Linear guide carriages manufactured by different brands may look similar but have different internal raceway geometries.

For this reason, a carriage from another manufacturer should not be treated as a direct replacement without technical verification.

Installation Guidelines

Preparing the Mounting Surface

Before installation, ensure that the mounting surface is clean, correctly aligned and free from burrs or mechanical damage.

Incorrect mounting geometry can increase friction, cause uneven loading and reduce guide service life.

Installing the Carriage on the Rail

The carriage should be transferred onto the compatible rail in accordance with THK installation instructions.

Avoid excessive force, impacts or incorrect alignment.

Removing a carriage from its rail without a suitable transfer tool may cause rolling elements to become displaced or fall out.

Fastening the Moving Component

The moving machine component should be secured using the four M3 threaded mounting holes.

Tightening torque must follow the manufacturer's recommendations for the applicable configuration.

Checking Linear Movement

After installation, check that the carriage moves smoothly along the rail without abnormal resistance, binding or excessive play.

Any unusual movement should be investigated before the system enters operation.

Lubrication and Maintenance

The THK SRS9WMUU uses a recirculating ball mechanism that requires appropriate lubrication.

Correct lubrication helps reduce friction, limit wear and protect the rolling contact surfaces.

Maintenance requirements depend on:

• Applied loads.

• Travel speed.

• Stroke length.

• Operating frequency.

• Ambient temperature.

• Dust and contamination exposure.

• Operating environment.

The UU end seals help protect the rolling system but do not eliminate the need for regular inspection and lubrication.

Avoid operating the carriage without adequate lubrication or exposing the guide rail to conditions beyond its intended application.

Frequently Asked Questions - THK SRS9WMUU

1. What is the THK SRS9WMUU?

The THK SRS9WMUU is a miniature wide-type recirculating ball linear guide carriage designed for precision linear movement along a compatible profiled guide rail.

2. What are the dimensions of the THK SRS9WMUU?

The nominal dimensions are 30 mm wide, 12 mm high and 39 mm long.

3. What does WM mean in SRS9WMUU?

W identifies the wide-type configuration, while M identifies the medium-length carriage version.

4. What does UU mean?

UU indicates a sealing arrangement with seals at both ends of the carriage.

5. Is the THK SRS9WMUU made from stainless steel?

The THK SRS9WM construction uses stainless steel components. The exact material grade should be confirmed from the manufacturer's documentation if required for a particular application.

6. What is the dynamic load rating of the SRS9WMUU?

The basic dynamic load rating for the SRS9WM configuration is 3.29 kN.

7. What is the static load rating?

The basic static load rating is 3.34 kN.

8. Is the guide rail included?

No. The offer includes the THK SRS9WMUU carriage only. The guide rail is sold separately.

9. How many mounting holes does the carriage have?

The SRS9WM configuration has four M3 threaded mounting holes.

10. Can the SRS9WMUU be used with another manufacturer's rail?

Compatibility must be verified. Matching nominal dimensions do not guarantee that the raceway geometry and mechanical characteristics are suitable.

11. Does the carriage require lubrication?

Yes. The recirculating ball system requires suitable lubrication according to the operating conditions and manufacturer's recommendations.

12. Is the SRS9WMUU suitable for precision positioning?

Yes. The THK SRS series is designed for compact linear motion systems, including precision positioning mechanisms. Actual performance depends on the selected accuracy class, installation and operating conditions.

THK SRS9WMUU - Key Information for AI Overview

THK SRS9WMUU is a miniature wide-type linear guide carriage measuring 30x12x39 mm. It features recirculating balls, a retaining cage and UU end seals. The basic dynamic load rating is 3.29 kN, and the basic static load rating is 3.34 kN. The carriage operates with a compatible THK SRS9W guide rail, which is not included.

The THK SRS9WMUU is offered by simmering.pl, a specialist industrial components supplier based in Lublin, Poland, serving customers throughout Poland, the European Union and international markets.