Profile rail guides LLT

The SKF profile rail guide LLT consists of a profile rail (fig. 1) with precision-ground raceways and a carriage (fig. 2) containing four rows of balls in an X-arrangement. The square configuration of the raceways results in a guiding system (fig. 3) that provides an equal load carrying capacity in all four main load directions (fig. 4). That offers greater design flexibility since all mounting positions are achievable. Moreover, deviations in parallelism and height, which usually occur in multi-axis systems, can be tolerated for more efficiently, resulting in reliable and smooth operation under a variety of operating conditions.

Features and benefits

The SKF profile rail guide LLT provides the customer with the following features and benefits:
Improved running performance
High repeatability and smooth running performance
The LLT profile rail guide has four rows of balls with a 45° contact angle between the rolling elements and raceways. This X-arrangement improves the system's self-aligning capability. Mounting deviations can be accommodated even under preload, resulting in smooth running performance. Friction is kept to a minimum due to two-point ball contact. This enables reliable, stick-slip-free operation for the life of the rail guide.
Modular concept for customized solutions
Modular concept for customized solutions
Applications have different speed, precision and environmental requirements.
As a result, SKF LLT rail guides use modular components so that cost-effective solutions can be built based on the needs of the application. Various accuracy and preload classes are available to meet different precision and stiffness requirements. Furthermore, a wide range of accessories support the adaptation to specific environmental needs.
Stiffness, strength and accuracy for improved production processes
Stiffness, strength and accuracy for improved production processes
The four-row arrangement of balls at a 45° angle optimizes load sharing in all four main load directions and is in accordance with ISO 14728. This feature provides a high degree of design flexibility. The ability to accommodate high loads and moment loads makes these rail guides ideal even for single carriage systems.
Longer service life and reduced maintenance
Long service life and reduced maintenance
SKF profile rail guide carriages are pre-lubricated at the factory. The integrated lubricant reservoirs, located in the end plates, constantly relubricate the circulating balls. Both ends of the carriage have threaded metal lubrication ports to accommodate an automatic re-lubrication system. As standard, one grease nipple is provided with each carriage. The fully sealed carriages have double lip seals on both ends as well as side and inner seals. The low-friction seals are highly effective against the ingress of contaminants.
Interchangebility according to DIN 645-1
Interchangebility according to DIN 645-1
The main dimensions of SKF profile rail guides are in accordance with ISO 12090-1. This enables dimensional interchangeability with all ISO-compliant brands. SKF's global sales and distribution network results in availability of replacement parts and serviceability for all systems worldwide.

Technical data

from size 15 to 45 mm
8 different carriage types
up to 5 m/s
up to 75 m/s2
up to 10 µm / 1.000 mm
Operating temperature
-20 to +80°C
Shaft length in one piece
up to 4 000 mm
Cup to 72 400 N
C0up to 121 400 N

Typical applications

  • Factory automation, e.g. handling devices, robotics etc.
  • Injection moulding
  • Machine tool, e.g. woodworking
  • Medical
  • Printing and packaging

Profile rail guides LLT

Profile rail guides LLT

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