VT-L · Linear Guide — Veltork telescopic rails

Construction & principle

Series VT-L is a linear ball-guide: a C-shaped cold-drawn steel rail with induction-hardened raceways, inside which one or more carriages travel on a ball cage. Because the carriages run within the rail profile, the solution is exceptionally space-efficient for the load it carries.

Carriages can be supplied as a single carriage, as several independent carriages (each in its own cage, with individual length and stroke), or as several synchronised carriages sharing one cage. Rail length L = S + H + K (carriage length + stroke + end allowance).

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High load per carriage

Ball-cage travel lets each carriage carry up to 12 000 kg in a compact section.

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Compact construction

Carriages run inside the C-profile — significant space saving over external blocks.

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Configurable carriages

One, several independent, or several synchronised carriages on a single rail.

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Long service life

Cold-drawn steel profiles with induction-hardened raceways for sustained duty.

Profile & cross-section dimensions

Faithful cross-section of the VT-L profile, redrawn in the Veltork system. Letter callouts (A width, B height, …) correspond to the dimension table — every size in the series is listed.

Cross-section — VT-L

Guide railCarriageBall cage

Extension principle

Cross-section dimensions — all sizes [mm]

Size	A [mm]	A₁ [mm]	B [mm]	J [mm]	G [mm]	Thread	Corner
22	11	10.25	22	11.3	6.5	M4	R3
28	13	12.25	28	15	7.5	M5	R1
35	17	16	35	15.8	10	M6	R2
43	22	21	43	23	13.5	M8	R2.5
63	29	28	63	29.3	10.5	M8	2×45°

Dimension callouts

Aoverall section width

A₁inner width — from the same outer face as A, stopping 0.75–1 mm short of the opposite face

Boverall section height

Jraceway span (distance between the two ball-row centres)

Gmounting-hole axis, measured in from the outer face

Threadmounting thread in rail and carriage

Cornercorner radius / chamfer of the outer profile

Mounting interface

Where the holes sit along the rail, what thread they carry, and the section envelope of each size — the two checks before you commit an interface.

Mounting-hole pattern — rail, plan view

The first mounting hole sits 25 mm from each end of the rail; the remaining holes follow a constant 80 mm pitch. The hole count for every catalogue length is listed in the specification tables below. Short carriages (S = 40 / 60 / 80 mm) use a tighter pattern — hole offset a and pitch b are given per carriage length in the carriage table.

Mounting threads: M4 (size 22) · M5 (size 28) · M6 (size 35) · M8 (size 43 / 63). Countersunk DIN 7991 or cheese-head DIN 7984.

Envelope per size — will it fit?

Size	Section W × H	Thread
VT-L22	11 × 22 mm	M4
VT-L28	13 × 28 mm	M5
VT-L35	17 × 35 mm	M6
VT-L43	22 × 43 mm	M8
VT-L63	29 × 63 mm	M8

Dimensions are nominal values from the VT-L engineering catalogue, in millimetres. For a custom hole pattern, length or finish, send us the interface and we return a drawing. Confirm against the released drawing or 3D model before machining mating parts.

Technical parameters & dimensions

Load capacity and moments are quoted per carriage. Rail length L = carriage length S + stroke H + end allowance K.

VT-L22 VT-L28 VT-L35 VT-L43 VT-L63

VT-L22 · load & moments per carriage

Carriage length S [mm]	a [mm]	b [mm]	No. of holes	C₀rad [N]	C₀ax [N]	Mx [Nm]	My [Nm]	Mz [Nm]
40	10	20	2	1320	924	4.4	6	9
60	10	20	3	1980	1386	6.7	14	20
80	10	20	4	2640	1848	8.9	25	35
130	25	80	2	4290	3003	14.4	65	93
210	25	80	3	6930	4851	23.3	170	243
290	25	80	4	9570	6699	32.2	324	463

Rail lengths L [mm]: 130, 210, 290, 370, 450, 530, 610, 690, 770, 850, 930, 1010, 1090, 1170 · K = 30 mm · rail 0.7 kg/m · carriage 1 kg/m.

VT-L28 · load & moments per carriage

Carriage length S [mm]	a [mm]	b [mm]	No. of holes	C₀rad [N]	C₀ax [N]	Mx [Nm]	My [Nm]	Mz [Nm]
60	10	20	3	3480	2436	17.1	24	35
80	10	20	4	4640	3248	22.7	43	62
130	25	80	2	7540	5278	36.9	114	163
210	25	80	3	12180	8526	59.7	298	426
290	25	80	4	16820	11774	82.4	569	813
370	25	80	5	21460	15022	105.1	926	1323
450	25	80	6	26100	18270	127.9	1370	1958

Rail lengths L [mm]: 130, 210, 290, 370, 450, 530, 610, 690, 770, 850, 930, 1010, 1090, 1170, 1250, 1330, 1410, 1490, 1570, 1650 · K = 30 mm · rail 1 kg/m · carriage 1.5 kg/m.

VT-L35 · load & moments per carriage

Carriage length S [mm]	a [mm]	b [mm]	No. of holes	C₀rad [N]	C₀ax [N]	Mx [Nm]	My [Nm]	Mz [Nm]
130	25	80	2	9750	6825	47.2	148	211
210	25	80	3	15750	11025	76.3	386	551
290	25	80	4	21750	15225	105.3	736	1051
370	25	80	5	27750	19425	134.4	1198	1711
450	25	80	6	33750	23625	163.4	1772	2531
530	25	80	7	39750	27825	192.5	2458	3511
610	25	80	8	45750	32025	221.6	3256	4651

Rail lengths L [mm]: 290, 370, 450, 530, 610, 690, 770, 850, 930, 1010, 1090, 1170, 1250, 1330, 1410, 1490, 1570, 1650, 1730, 1810 · K = 30 mm · rail 1.8 kg/m · carriage 2.5 kg/m.

VT-L43 · load & moments per carriage

Carriage length S [mm]	a [mm]	b [mm]	No. of holes	C₀rad [N]	C₀ax [N]	Mx [Nm]	My [Nm]	Mz [Nm]
130	25	80	2	13910	9737	96	211	301
210	25	80	3	22470	15729	155.1	551	786
290	25	80	4	31030	21721	214.1	1050	1500
370	25	80	5	39590	27713	273.2	1709	2441
450	25	80	6	48150	33705	332.3	2528	3611
530	25	80	7	56710	39697	391.4	3507	5009
610	25	80	8	65270	45689	450.4	4645	6636

Rail lengths L [mm]: 290, 370, 450, 530, 610, 690, 770, 850, 930, 1010, 1090, 1170, 1250, 1330, 1410, 1490, 1570, 1650, 1730, 1810, 1890, 1970 · K = 30 mm · rail 2.6 kg/m · carriage 5 kg/m.

VT-L63 · load & moments per carriage

Carriage length S [mm]	a [mm]	b [mm]	No. of holes	C₀rad [N]	C₀ax [N]	Mx [Nm]	My [Nm]	Mz [Nm]
130	25	80	2	26000	18200	238.8	394	563
210	25	80	3	42000	29400	385.8	1029	1470
290	25	80	4	58000	40600	532.8	1962	2803
370	25	80	5	74000	51800	679.8	3194	4563
450	25	80	6	90000	63000	826.7	4725	6750
530	25	80	7	106000	74200	973.7	6554	9363
610	25	80	8	122000	85400	1120.7	8682	12403

Rail lengths L [mm]: 610, 690, 770, 850, 930, 1010, 1090, 1170, 1250, 1330, 1410, 1490, 1570, 1650, 1730, 1810, 1890, 1970 · K = 30 mm · rail 6.1 kg/m · carriage 6.9 kg/m.

Part-number builder

VT-L 35 . 290 . 430 . 770 . G1 . N

Mounting via countersunk DIN 7991 screws: M4 (22) · M5 (28) · M6 (35) · M8 (43 / 63).

Examples

VT-L35.290.430.770
VT-L43-2.290.350.1330 (two independent carriages)
VT-L63.850.370+290.400.1330 (synchronised carriages)

Field	Meaning
VT-L	Series — linear ball guide
35	Size (22 / 28 / 35 / 43 / 63)
290	Carriage length S [mm]
430	Stroke H [mm]
770	Rail length L [mm]
G1 / K1	G1 = increased clearance · K1 = increased preload (blank = zero clearance)
N / Z	Surface ≠ standard zinc: N = nickel · Z = zinc-nickel

Build your part number & request a price

Open the inquiry builder to pick size & length from the live catalogue, assemble the code automatically and send it for a quote.

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Technical data

ExtensionLinear

Load basisper carriage

Peak C₀rad122 kN

Available sizes22 · 28 · 35 · 43 · 63

Max rail length1 970 mm

Operating temperature−20 … +170 °C

Max working speed≤ 0.8 m/s (derates with length) · max accel 1.2 m/s²

MaterialCF53 · hardened raceways

RacewaysInduction-hardened raceways

BallsCarbon-steel balls (stainless on request)

Surface coatingsZinc per ISO 2081 (standard) · zinc-nickel · nickel · E-coat on request

LubricationMedium lithium grease; re-lube every 100 km or 6 months. FDA, cleanroom, marine & temperature greases on request.

Clearance / preloadG1 increased clearance · standard zero-clearance · K1 increased preload

FasteningCountersunk DIN 7991 or cheese-head DIN 7984. Torque (10.9): 22→3, 28→6, 35→10, 43→25, 63→30 N·m.

function Selection & sizing

Rated loads are static C₀ values, applied at the centre of the moving member in the fully extended position. Check against a static safety factor S₀ and verify deflection before specifying.

Static safety factor S₀

1.5 smooth · 1.5–2 normal · 2–3.5 shock & vibration. Keep P / C₀ ≤ 1 / S₀.

Deflection

f = (q / t) · P [mm]

q = travel coefficient · t = model coefficient · P = central load.

Typical applications

Transport industryConstructionGeneral machine buildingMedical & automotive equipmentLogistics systemsPackaging machinery

Explore the VT range

VT-PPartial extensionarrow_forward VT-SSlim full extensionarrow_forward VT-XI-beam full extensionarrow_forward VT-OSquare full extensionarrow_forward VT-HHeavy-duty full ext.arrow_forward

Specify your VT-L — custom length, hole pattern or finish.

Configure the exact model and send it for a quote, or let the configurator find the right series first. Our team returns a part number, deflection estimate and 3D model — prototypes in under 14 days.