Profile-rail linear guides · ball and roller
Roller and ball profile-rail guides with load ratings to ISO 14728 and mounting dimensions interchangeable with the leading brands — three series, 20 carriage types, sizes 15 to 65, accuracy classes N to UP.
Rollers for the highest load and rigidity, balls in O- or X-arrangement for speed and easy mounting. Every series: equal load ratings in the four main load directions, five accuracy classes and graded preload.
| Property | VR | VB | VX |
|---|---|---|---|
| Rolling elements | Cylindrical rollers | Balls | Balls |
| Raceway arrangement | O-arrangement (back-to-back) | O-arrangement (back-to-back) | X-arrangement (face-to-face) |
| Sizes | 25–65 | 15–65 | 20–35 |
| Carriage types | VR51, VR53, VR22, VR23, VR21, VR24 | VB51, VB53, VB22, VB23, VB21, VB24 | VX51, VX53, VX50, VX54, VX22, VX23, VX21, VX24 |
| Max dynamic load rating C | 280.6 kN | 156.1 kN | 59.4 kN |
| Max static load rating C₀ | 535.0 kN | 282.8 kN | 117.4 kN |
| Max speed | 4 m/s | 5 m/s | 2 m/s |
| Max acceleration | 150 m/s² | 500 m/s² | 40 m/s² |
| Accuracy classes | H · P · SP · UP | N · H · P · SP · UP | N · H · P · SP · UP |
| Preload classes | C1 · C2 · C3 | C0 · C1 · C2 · C3 | C0 · C1 · C2 · C3 |
| Interchangeable carriages and rails | Matched sets; carriages and rails also separately | Yes — within one accuracy class | Yes — within one accuracy class |
| Best for | Highest load and rigidity: machine tools, robots, heavy axes | All-round: high speed and acceleration, sizes 15–65 | Tolerant of mounting errors; bolting from below (VX50 / VX54) |
The last two digits of the type code describe the carriage: 5x flanged, 2x narrow; long and high variants raise load capacity and mounting height. VX50 and VX54 have plain through-holes for bolting from below.
| Carriage type | VR | VB | VX |
|---|---|---|---|
| Flanged carriage, standard lengthBolt from above or below | VR51Sizes 25–65 | VB51Sizes 15–65 | VX51Sizes 20–35 |
| Flanged carriage, longBolt from above or below | VR53Sizes 25–65 | VB53Sizes 15–65 | VX53Sizes 20–35 |
| Flanged carriage, standard length, through-holesThrough-holes — bolt from below | — | — | VX50Sizes 20–35 |
| Flanged carriage, long, through-holesThrough-holes — bolt from below | — | — | VX54Sizes 20–35 |
| Narrow carriage, standard lengthBolt from above | VR22Sizes 25–65 | VB22Sizes 15–65 | VX22Sizes 20–35 |
| Narrow carriage, longBolt from above | VR23Sizes 25–65 | VB23Sizes 15–65 | VX23Sizes 20–35 |
| Narrow carriage, standard length, highBolt from above | VR21Sizes 25–55 | VB21Sizes 15–55 | VX21Sizes 25–35 |
| Narrow carriage, long, highBolt from above | VR24Sizes 25–55 | VB24Sizes 25–55 | VX24Sizes 25–35 |
Five accuracy classes define the permissible deviation of height and width; four preload classes set rigidity against running smoothness. Not every combination exists — each series page lists the available ones.
| Accuracy class | Height H | Width W | ΔH · ΔW on one rail |
|---|---|---|---|
| N — normal | ± 100 µm | ± 40 µm | 30 µm |
| H — high | ± 40 µm | ± 20 µm | 15 µm |
| P — precision | ± 20 µm | ± 10 µm | 7 µm |
| SP — super precision | ± 10 µm | ± 7 µm | 5 µm |
| UP — ultra precision | ± 5 µm | ± 5 µm | 3 µm |
Height H: carriage top to rail base; width W: carriage reference edge to rail reference side; ΔH / ΔW: difference between carriages on one rail.
| Preload class | Recommended for |
|---|---|
| C0 — very light, 0–2 % C | Smoothest running and lowest friction; ball guides only, accuracy N and H. |
| C1 — light, 3 % C | Small external loads where overall rigidity still matters. |
| C2 — medium, 8 % C | Large loads, single-rail systems, high accelerations; takes above-average moments with little elastic deformation. |
| C3 — heavy, 12 % C | High-rigidity axes such as precision machine tools; minimum elastic deformation under high loads and moments. Accuracy P, SP, UP. |
Roller guides additionally on request: C4 (16 % C) and C5 (19 % C), accuracy P, SP and UP. Choose C2 or C3 for vibrating applications.
End seals and bottom seals are standard. Metal scrapers, double end seals and inner seal strips along the upper raceways — which keep dust away from the rolling elements even if it gets into the carriage — are added for dirty environments.
| Code | Seal kit |
|---|---|
| — | end seal + bottom seal (standard) |
| ZZ | end seal + metal scraper + bottom seal |
| KK | double end seal + metal scraper + bottom seal |
| DD | double end seal + bottom seal |
| SH | end seal + bottom seal + inner seal strip |
| ZH | end seal + metal scraper + bottom seal + inner seal strip |
| KH | double end seal + metal scraper + bottom seal + inner seal strip |
| DH | double end seal + bottom seal + inner seal strip |
Grease nipples M4×0.7, M6×1 and PT1/8 (straight or 45°); oil fittings M6×1 or PT1/8 to M8×1 (straight or 90°) and push-in fittings for Ø4 mm tube. Supplied pre-lubricated — rail oil, lithium grease or a light anti-corrosion oil. Lube ports on the top, sides and ends of both end caps; with a stroke longer than twice the carriage length, one end cap is enough.
Counterbored rail holes are closed with plastic or brass plugs, or the whole rail top is covered by a stainless-steel strip so no chips can collect. Bottom-lock rails, screwed from below, need no cover at all.
Oiled as standard; rails and carriages also with hard chrome (silver), black chrome, nickel plating, black oxide — or made of stainless steel.
One code describes the complete guide — rails and carriages, accuracy, preload and length. Carriages and rails of the interchangeable series can also be ordered on their own.
VR51 · size 35 · C1 · accuracy H · 2 carriages per rail · L = 1240 mm · 2 rails · end holes 20/20 mm. Required part in orange; options in grey.
Every field is explained on the series pages — VR, VB, VX — and the inquiry builder assembles the code for you.
Rolling guides are stiff and low-friction — and for the same reason pass vibration from the drive or the cut straight into the table, which settles slowly and costs surface quality and tool life. Instead of a separate damper under the table, VELTORK builds a damping block into the carriage: it runs parallel to the rail top with a defined gap, and the oil film in that gap damps the motion. The smaller the gap, the stronger the damping.
Absorbs vibration for better surface quality and longer tool life.
Protects the linear guide under overload.
No separate damper or mounting position on the table.
Low friction, speed and accuracy of a rolling guide with damping close to a hydrostatic guide.
Rolling friction is about 1/40 of a sliding guide, with almost no difference between static and dynamic friction — µm feeds without stick-slip.
Very little wear, so the machine keeps its accuracy over a long service life.
Low friction means smaller drives, less heat and high travel speeds.
Carries loads from above, below and both sides — and moments — at the same time.
Bolt rails and carriages to milled or ground faces; replace carriages or rails individually.
Grease nipple or oil fitting on the carriage; central lubrication can be connected directly.
Linear-guide product catalogue
Dimension drawings, ordering code, technical principles and selection forms in print layout. PDF · 89 pages · 11.6 MB · English.
Looking for the VT-L compact linear slide with a C-profile rail? It belongs to the telescopic range — VT-L.
Send us the axis — load, stroke, speed, mounting and required accuracy. We return the order code, a service-life estimate and the dimension drawing.
