VT-H · Heavy-Duty Full Extension — Veltork telescopic rails

Construction & principle

Series VT-H is the heavy-duty family — a special execution reaching ~100 % extension on a high-strength I-beam intermediate. It is built to move very heavy loads at minimal deflection, with high mechanical rigidity and long service life under intensive use. Right-hand or left-hand execution must be specified.

VT-H is defined less by a single peak rating than by its build and configurability: executions F (fixed hole pitch), V (variable hole pitch) and S (reinforced stainless damped stops), plus detents, locks, closed-position damping, double-stroke and synchronising-disc options. Materials and coatings are tailored to the project; radial load capacity per pair is quoted per configuration, and C₀ax is on request.

weight

Very heavy loads

I-beam core and twin carriages move heavy loads at minimal deflection.

tune

Fully configurable

Detents, locks, damping, double-stroke and L/R hand to match the application.

straighten

Rigid full extension

~100 % access with high system rigidity for precise pull-out units.

straighten

Largest sections

Sizes to 80 — the largest, strongest profiles in the VT range.

Profile & cross-section dimensions

Cross-section of the VT-H profile. Letter callouts (A width, B height, …) correspond to the dimension table — every size in the series is listed.

Cross-section — VT-H

Extension principle

Cross-section dimensions — all sizes [mm]

Sizes 30 / 45 — mm

Type	Size	A	B	J	G	K	Thread F	Weight [kg/m]
VT-H	30	20	30	16.2	5.0	15.0	M6	3.5
VT-H	45	26	45	25.5	6.1	22.5	M8	6.0

Sizes 60 / 80 — mm

Type	Size	A	B	J	G	K	D	Thread F	Weight [kg/m]
VT-H	60	32	60	40	10	19	22	M6	11.70
VT-H	80	36	80	50	12	25	30	M10	17.50

Dimension callouts

Aoverall section width

Boverall section height

Jraceway span (distance between the ball-row centres)

Gmounting-hole axis, measured in from the outer face

Kbase → nearest mounting-hole axis

Dspacing between the two mounting-hole axes (sizes 60 / 80)

Fmounting thread

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. Execution F has a fixed hole pitch, execution V a variable pitch specified per order.

Mounting threads: M6 (size 30 / 60) · M8 (size 45) · M10 (size 80). Countersunk DIN 7991 or cheese-head DIN 7984.

Envelope per size — will it fit?

Size	Section W × H	Thread
VT-H30	20 × 30 mm	M6
VT-H45	26 × 45 mm	M8
VT-H60	32 × 60 mm	M6
VT-H80	36 × 80 mm	M10

Dimensions are nominal values from the VT-H 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

Radial capacity C₀rad is per pair of rails; C₀ax is on request. m / n (and Y / E / C for sizes 60–80) are mounting-hole pitches.

VT-H30F VT-H30V VT-H30S VT-H45F VT-H45V VT-H45S VT-H60 VT-H80

VT-H30F · 20 lengths

Size	Length L [mm]	Stroke H [mm]	C₀rad [N]	C₀ax [N]	m	n	No. of holes
30	250	285	404	on request	25	100	3
30	300	323	1008	on request	50	100	3
30	350	377	1042	on request	25	100	4
30	400	416	1136	on request	50	100	4
30	450	485	1164	on request	25	100	5
30	500	523	1470	on request	50	100	5
30	550	577	1464	on request	25	100	6
30	600	615	1402	on request	50	100	6
30	650	685	1230	on request	25	100	7
30	700	723	1186	on request	50	100	7
30	750	777	1100	on request	25	100	8
30	800	815	1066	on request	50	100	8
30	850	884	962	on request	25	100	9
30	900	923	936	on request	50	100	9
30	950	977	882	on request	25	100	10
30	1000	1015	858	on request	50	100	10
30	1050	1084	792	on request	25	100	11
30	1100	1123	772	on request	50	100	11
30	1150	1176	736	on request	25	100	12
30	1200	1215	720	on request	50	100	12

VT-H30V · 20 lengths

Size	Length L [mm]	Stroke H [mm]	C₀rad [N]	C₀ax [N]	m	n	No. of holes
30	250	285	404	on request	-	150	4
30	300	323	1008	on request	-	200	4
30	350	377	1042	on request	-	250	4
30	400	416	1136	on request	175	300	6
30	450	485	1164	on request	200	350	6
30	500	523	1470	on request	225	400	6
30	550	577	1464	on request	250	450	6
30	600	615	1402	on request	275	500	6
30	650	685	1230	on request	300	550	6
30	700	723	1186	on request	325	600	6
30	750	777	1100	on request	350	650	6
30	800	815	1066	on request	375	700	6
30	850	884	962	on request	400	750	6
30	900	923	936	on request	425	800	6
30	950	977	882	on request	450	850	6
30	1000	1015	858	on request	475	900	6
30	1050	1084	792	on request	500	950	6
30	1100	1123	772	on request	525	1000	6
30	1150	1176	736	on request	550	1050	6
30	1200	1215	720	on request	575	1100	6

VT-H30S · 19 lengths

Size	Length L [mm]	Stroke H [mm]	C₀rad [N]	C₀ax [N]	m	n	No. of holes
30	300	310	816	on request	50	100	3
30	350	364	880	on request	75	100	3
30	400	402	994	on request	50	100	4
30	450	472	1032	on request	75	100	4
30	500	510	1330	on request	50	100	5
30	550	564	1498	on request	75	100	5
30	600	618	1392	on request	50	100	6
30	650	671	1276	on request	75	100	6
30	700	725	1178	on request	50	100	7
30	750	764	1138	on request	75	100	7
30	800	817	1060	on request	50	100	8
30	850	871	992	on request	75	100	8
30	900	925	932	on request	50	100	9
30	950	979	878	on request	75	100	9
30	1000	1017	856	on request	50	100	10
30	1050	1071	810	on request	75	100	10
30	1100	1109	790	on request	50	100	11
30	1150	1179	732	on request	75	100	11
30	1200	1217	718	on request	50	100	12

VT-H45F · 26 lengths

Size	Length L [mm]	Stroke H [mm]	C₀rad [N]	C₀ax [N]	m	n	No. of holes
45	250	276	2610	on request	25	100	3
45	300	310	2824	on request	50	100	3
45	350	388	2820	on request	25	100	4
45	400	422	2842	on request	50	100	4
45	450	478	2864	on request	25	100	5
45	500	512	2900	on request	50	100	5
45	550	590	2764	on request	25	100	6
45	600	624	3032	on request	50	100	6
45	650	680	3252	on request	25	100	7
45	700	714	3346	on request	50	100	7
45	750	770	3084	on request	25	100	8
45	800	826	2860	on request	50	100	8
45	850	882	2666	on request	25	100	9
45	900	916	2614	on request	50	100	9
45	950	972	2450	on request	25	100	9
45	1000	1028	2306	on request	50	100	10
45	1050	1084	2178	on request	25	100	10
45	1100	1118	2144	on request	50	100	11
45	1150	1174	2034	on request	25	100	11
45	1200	1230	1934	on request	50	100	12
45	1250	1286	1842	on request	25	100	13
45	1300	1320	1818	on request	50	100	13
45	1350	1376	1738	on request	25	100	14
45	1400	1410	1716	on request	50	100	14
45	1450	1488	1596	on request	25	100	15
45	1500	1522	1578	on request	50	100	15

VT-H45V · 26 lengths

Size	Length L [mm]	Stroke H [mm]	C₀rad [N]	C₀ax [N]	m	n	No. of holes
45	250	276	2610	on request	-	150	4
45	300	310	2824	on request	-	200	4
45	350	388	2820	on request	-	250	4
45	400	422	2842	on request	175	300	6
45	450	478	2864	on request	200	350	6
45	500	512	2900	on request	225	400	6
45	550	590	2764	on request	250	450	6
45	600	624	3032	on request	275	500	6
45	650	680	3252	on request	300	550	6
45	700	714	3346	on request	325	600	6
45	750	770	3084	on request	350	650	6
45	800	826	2860	on request	375	700	6
45	850	882	2666	on request	400	750	6
45	900	916	2614	on request	425	800	6
45	950	972	2450	on request	450	850	6
45	1000	1028	2306	on request	475	900	6
45	1050	1084	2178	on request	500	950	6
45	1100	1118	2144	on request	525	1000	6
45	1150	1174	2034	on request	550	1050	6
45	1200	1230	1934	on request	575	1100	6
45	1250	1286	1842	on request	600	1150	6
45	1300	1320	1818	on request	625	1200	6
45	1350	1376	1738	on request	650	1250	6
45	1400	1410	1716	on request	675	1300	6
45	1450	1488	1596	on request	700	1350	6
45	1500	1522	1578	on request	725	1400	6

VT-H45S · 25 lengths

Size	Length L [mm]	Stroke H [mm]	C₀rad [N]	C₀ax [N]	m	n	No. of holes
45	300	310	1316	on request	50	100	3
45	350	366	1832	on request	75	100	3
45	400	422	1666	on request	50	100	4
45	450	456	2154	on request	75	100	4
45	500	512	1972	on request	50	100	5
45	550	568	2200	on request	75	100	5
45	600	624	2204	on request	50	100	6
45	650	680	2426	on request	75	100	6
45	700	714	2942	on request	50	100	7
45	750	770	3084	on request	75	100	7
45	800	826	2860	on request	50	100	8
45	850	882	2666	on request	75	100	8
45	900	916	2614	on request	50	100	9
45	950	972	2450	on request	75	100	9
45	1000	1028	2306	on request	50	100	10
45	1050	1084	2178	on request	75	100	10
45	1100	1118	2144	on request	50	100	11
45	1150	1174	2034	on request	75	100	11
45	1200	1230	1934	on request	50	100	12
45	1250	1286	1842	on request	75	100	12
45	1300	1320	1818	on request	50	100	13
45	1350	1376	1738	on request	75	100	13
45	1400	1410	1716	on request	50	100	14
45	1450	1488	1596	on request	75	100	14
45	1500	1522	1578	on request	50	100	15

VT-H60 · 18 lengths

Size	Length L [mm]	Stroke H [mm]	C₀rad [N]	C₀ax [N]	Y	m	n	E	C	No. of holes
60	400	400	5250	on request	50	50	-	-	200	8
60	450	450	5350	on request					250
60	500	500	5400	on request					300
60	550	550	5500	on request			150	50	-	12
60	600	600	5400	on request			175
60	650	650	5350	on request			200
60	700	700	5250	on request			225
60	750	750	5100	on request			250
60	800	800	4900	on request			275
60	850	850	4700	on request			300
60	900	900	4500	on request			325
60	950	950	4300	on request			350
60	1000	1000	4050	on request			375
60	1100	1100	3700	on request			425
60	1200	1200	3300	on request			475
60	1300	1300	2900	on request			525
60	1400	1400	2500	on request			575
60	1500	1500	2100	on request			625

VT-H80 · 21 lengths

Size	Length L [mm]	Stroke H [mm]	C₀rad [N]	C₀ax [N]	Y	m	n	E	C	No. of holes
80	500	500	9000	on request	100	100	-	-	100	8
80	550	550	9250	on request					150
80	600	600	9350	on request					200
80	650	650	9200	on request					250
80	700	700	9050	on request					300
80	750	750	8800	on request					350
80	800	800	8600	on request					400
80	850	850	8350	on request					450
80	900	900	8100	on request					500
80	950	950	7850	on request					550
80	1000	1000	7550	on request					600
80	1100	1100	7150	on request			300	100	-	12
80	1200	1200	6700	on request			350
80	1300	1300	6200	on request			400
80	1400	1400	5700	on request			450
80	1500	1500	5200	on request			500
80	1600	1600	4600	on request			550
80	1700	1700	4100	on request			600
80	1800	1800	3600	on request			650
80	1900	1900	3000	on request			700
80	2000	2000	2500	on request			750

Part-number builder

VT-H 30F . 500 . 523 . C . N . L . V1

Load capacity is per pair of rails; C₀ax is quoted on request. Stroke change is on request.

Examples

VT-H30F.500.523.C.N.L.V1
VT-H80.1000.C.N.R

Field	Meaning
VT-H	Series — heavy-duty full extension
30F	Size + execution: F fixed pitch · V variable pitch · S stainless damped stops
500	Rail length L [mm]
523	Stroke H [mm] (change on request)
C	Accessory — detents O/C/OC · locks BO/BC/BCO · damping DC · double-stroke DS/DSS
N	Additional coating if ≠ standard ISO 2081 zinc
L / R	Hand: L = left · R = right (must be specified)
V1 / V2	Config: V1 countersunk DIN 7991 holes · V2 special stroke + stainless balls + special grease

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.

tune Not sure? Configurator

Technical data

Extension≈ 100 %

Load basisper pair of rails

Peak C₀radOn request / by configuration

Available sizes30 · 45 · 60 · 80

Max rail length2 000 mm

Operating temperature−20 … +170 °C (damped-stop executions −20 … +80 °C)

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

MaterialCF53 · not hardened

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

Railway service & battery compartmentsAutomotive equipmentConstruction & machine-building equipmentSpecial machine building

Specify your VT-H — 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.