GN 2408

Telescopic linear slides

with H-shaped rail

GN 2408

Telescopic linear slides
Telescopic linear slides

GN 2408

Telescopic linear slides
Telescopic linear slides


  • Type GG: Runner with thread, on both sides
  • Type DG: Runner 1x with countersunk and 1x with thread
  • Type DD: Runner with countersunk, on both sides

Rail / Runner

Heat treatable steel

  • zinc plated, blue passivated
  • Raceways hardened


Anti-friction bearing steel, hardened

Ball cage

Steel, zinc plated

Rail connection

  • Blank rivets, Stainless Steel (h1 = 28 and 35)
  • Screws, Steel zinc plated (h1 = 43)

Telescopic linear slides GN 2408 consist of two interconnected linear slides. They are used, for example, in handling or automation applications and in jigmaking, for straight-line traversal distance when large extension and a low construction height of the rail are required. The H-shape of the rails profile gives the configuration a high degree of sturdiness.

The rails and runners are equal in length.Both rails can be extended so that an extension is reached which is longer than the base length l1.Removing the support screws from the rails allows a stroke of the runners on both sides.The position of the rail is defined only at the two end positions.

Depending on the requirements, three types are available with different mounting holes.External elements should limit the maximum sliding distance; the supports of the rail have been designed to guard against the inadvertent extraction of the runner from the rail.

  • other lengths (based on the standard lengths grid dimension of 80 mm)
  • Special lengths (bore, start and end distances)
  • Version with defined movement of the rail (only for two-way stroke)


All linear slides consist of an outer rail with a runner moving inside. Anti-friction bearings, kept at a distance and in position by means of a ball cage, lie between the rail and the runner. Rail and runner are made of heat treatable steel, enabling their use in industrial environments with higher requirements in terms of load rating, quiet operation and useful service life.

All designs are available in the nominal rail dimensions h1 = 28, 35 and 43 mm and may also be supplied beyond the standard range in lengths from 130 mm to 1970 mm, appropriate for individual requirements.

Linear slides are normally adjusted so that a clearance-free (i.e. moderately pre-stressed) match-up is created between rail and runner. The raceways of the rails and runners are induction hardened, which combined with the antifriction bearings results in lower wear and longer service life. Linear slides are permanently lubricated with a high-grade special grease designed for linear guide rail systems.

Depending on requirements, a variety of different types are available. Sliding distances of the runners are inside, partly outside or entirely outside the length of the rails. Fully extendable telescopic linear slides consist of linear slides directly interconnected at the rails, the runners or with the help of an intermediate profile.

To mount linear slides, countersinks in the rails and, depending on type of construction, threaded or countersunk holes in the runners are available. The compact style is generally advantageous for use in tight spaces.



Telescopic linear slides, H-Shaped rail, with full extension


Assembly examples


Load rating of telescopic linear slides

in ascending order of the standard numbers

When selecting a suitable linear slide, it is primarily the available space, the desired stroke and the load carried which must be taken into consideration. The values listed below are intended as guidelines for selecting the most suitable nominal rail size.

The details on load rating are non-binding guide values given without liability and does not constitute any type of guarantee or warranty of its intended use. The user must determine in each individual case whether a product is suitable for the intended application. Environmental factors and aging may affect the stated values.

DescriptionLoad ratings
-Co rad in N
GN 2408-28-210-...447
GN 2408-28-370-...1000
GN 2408-28-450-...1205
GN 2408-28-530-...1140
GN 2408-35-370-...1035
GN 2408-35-450-...1265
GN 2408-35-530-...1705
GN 2408-35-610-...1930
GN 2408-43-450-...1890
GN 2408-43-610-...3035
GN 2408-43-770-...3145
GN 2408-43-930-...2580

No details on the permissible load torques are given for the telescopic linear slides as these are normally used for paired applications. Loads of these dimensions occur to a minor degree because it may be assumed that the surrounding construction has sufficient rigidity and stiffness. Transferring load torques within certain limited is permitted.

Static load and deflection

The load values given in the tables refer to a maximum permissible force allowed to act in the middle of the fully extended profile rail at the third segment.

If the given values are observed and if the telescopic linear slide is fully extended, a minor deflection (sag) occurs at the end of the runner or of the rail. This has normally no detrimental effect on the proper function of the application. If required, guide values may be given if requested.

Mounting screws, assignment of the mounting holes

The standard mounting hardware is DIN 7991-10.9 countersunk head screws, to be mounted with the recommended tightening torque. Depending on type, not all mounting holes may be utilized. In general, these holes can be left unused. In exceptional cases, especially in bilateral stroke, mounting holes can be accessed by loosening the support screws and by pulling out the runner. The support screws are then put back in place.

Traversal speed, cage slip

The traversal speed in linear slides can be as much as 0.8 m/s. The particular application and the installation length can have an effect on this value. In the event of rapid changes of direction and high accelerating forces, cage slip may occur in some cases, especially in long ball cages. In cases such as these, the cage does not move synchronously with half the speed of the runner, but gradually loses its correct position owing to the slip. Whenever possible, running a blank stroke to the end of the traversal distance should be provided for back positioning.



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