VR series · Roller guide
Roller carriages in O-arrangement for machine tools, industrial robots and heavy automation — the highest load ratings and rigidity in the range, equal in all four main load directions.
Know the type and size? Build the order code and request a price. Still choosing? Compare roller and ball guides, accuracy classes and preload first.
Dimensions and load ratings arrow_downward
VELTORK roller linear guides were developed for machine tools, industrial robots and general machine building — wherever a compact rolling guide has to carry high loads with high rigidity. The standard carriages cover the classic applications with universal mounting dimensions and also suit special mounting conditions and environments.
Cylindrical rollers run on four raceways in O-arrangement. Line contact instead of point contact gives the same, very high load rating in all four main load directions and very little elastic deformation. Flanged carriages carry two additional holes in the middle for extra bolting, which raises the rigidity in every load direction.
The Jiangmen plant specialises in roller guides of accuracy class SP and higher. Load ratings and mounting dimensions follow ISO 14728; the main mounting dimensions are interchangeable with the leading brands.
O-arrangement (back-to-back) — cylindrical rollers on four raceways; the red lines show the contact directions.
Up to C = 280.6 kN and C₀ = 535 kN per carriage (VR53, size 65).
Equal load ratings in the four main directions; centre holes for extra bolting.
Up to 4 m/s and 150 m/s².
Accuracy classes H, P, SP and UP; preload C1 to C3.
Flanged carriages bolt from above or below and spread the load over a wider base; narrow carriages need less width and bolt from above. Long carriages raise load ratings and moment capacity, high carriages raise the mounting height.






Dimension drawing and every size for each carriage type, as in the catalogue. Load ratings per carriage; dimensions in millimetres.
VR in the linear-guide catalogue — pages 9–22
Dimension drawings, ordering code, technical principles and selection forms in print layout. PDF · 89 pages · 11.6 MB · English.

| Size | Carriage | A | A1 | A2 | A3 | L | L1 | E1 | E2 | E3 | H | H1 | H21 | H22 | K1 | K2 | K3 | K4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | VR51.2 | 70 | 35 | 23 | 23.5 | 100.6 | 64.6 | 57 | 45 | 40 | 36 | 30.5 | 24.3 | 24 | 17.8 | 5.5 | 6.4 | 15.8 |
| 30 | VR51.7 | 90 | 45 | 28 | 31 | 111.5 | 71.5 | 72 | 52 | 44 | 42 | 35.5 | 28.3 | 28 | 17.8 | 6.1 | 5.9 | 16.8 |
| 35 | VR51.3 | 100 | 50 | 34 | 33 | 118 | 79.6 | 82 | 62 | 52 | 48 | 41 | 31.1 | 30.80 | 17.4 | 7 | 7 | 15.5 |
| 45 | VR51.4 | 120 | 60 | 45 | 37.5 | 147 | 101.5 | 100 | 80 | 60 | 60 | 51 | 39.1 | 38.80 | 20.3 | 8.1 | 8.1 | 17.6 |
| 55 | VR51.5 | 140 | 70 | 53 | 43.5 | 170.7 | 123.1 | 116 | 95 | 70 | 70 | 58 | 47.9 | 47.55 | 24.9 | 9 | 8.9 | 20.9 |
| 65 | VR51.6 | 170 | 85 | 63 | 53.5 | 207.3 | 146 | 142 | 110 | 82 | 90 | 76 | 58.2 | 57.85 | 32.9 | 9.6 | 9.6 | 30 |
H21 with rail cover strip · H22 without cover strip.
| Size | Carriage | N1 | N2 | N3 | ØD | S1 | ØS2 | T | T1 | V1 | CN | C0N | MtN·m | Mt0N·m | MLN·m | ML0N·m | Carriagekg | Railkg/m |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | VR51.2 | 10 | 5.3 | 15 | 11 | M8 | 7 | 30 | 20 | 7.5 | 29300 | 58500 | 380 | 760 | 290 | 570 | 0.73 | 3.2 |
| 30 | VR51.7 | 11 | 5.5 | 16 | 14 | M10 | 9 | 40 | 20 | 7.8 | 45080 | 90000 | 760 | 1520 | 480 | 950 | 1.15 | 4.6 |
| 35 | VR51.3 | 12 | 11 | 19.8 | 15 | M10 | 9 | 40 | 20 | 8 | 54100 | 105900 | 1070 | 2100 | 670 | 1310 | 2.15 | 6.3 |
| 45 | VR51.4 | 15 | 13.5 | 22.8 | 20 | M12 | 14 | 52.5 | 22.5 | 10 | 95700 | 185800 | 2340 | 4550 | 1460 | 2840 | 4.05 | 10.3 |
| 55 | VR51.5 | 18 | 13.9 | 28.7 | 23 | M14 | 16 | 60 | 30 | 12 | 132000 | 250800 | 3880 | 7370 | 2430 | 4600 | 5.44 | 13.1 |
| 65 | VR51.6 | 23 | 21.5 | 36.5 | 26 | M16 | 18 | 75 | 35 | 15 | 224900 | 401200 | 7940 | 14170 | 4960 | 8860 | 10.72 | 17.4 |

| Size | Carriage | A | A1 | A2 | A3 | L | L1 | E1 | E2 | E3 | H | H1 | H21 | H22 | K1 | K2 | K3 | K4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | VR53.2 | 70 | 35 | 23 | 23.5 | 117 | 81 | 57 | 45 | 40 | 36 | 30.5 | 24.3 | 24 | 26 | 5.5 | 6.4 | 24 |
| 30 | VR53.7 | 90 | 45 | 28 | 31 | 136 | 96 | 72 | 52 | 44 | 42 | 35.5 | 28.3 | 28 | 30 | 6.1 | 5.9 | 29 |
| 35 | VR53.3 | 100 | 50 | 34 | 33 | 142 | 103.6 | 82 | 62 | 52 | 48 | 41 | 31.1 | 30.80 | 29.4 | 7 | 7 | 27.5 |
| 45 | VR53.4 | 120 | 60 | 45 | 37.5 | 179.5 | 134 | 100 | 80 | 60 | 60 | 51 | 39.1 | 38.80 | 36.5 | 8.1 | 8.1 | 33.8 |
| 55 | VR53.5 | 140 | 70 | 53 | 43.5 | 209.7 | 162.1 | 116 | 95 | 70 | 70 | 58 | 47.9 | 47.55 | 44.4 | 9 | 8.9 | 40.4 |
| 65 | VR53.6 | 170 | 85 | 63 | 53.5 | 255.3 | 194 | 142 | 110 | 82 | 90 | 76 | 58.2 | 57.85 | 56.9 | 9.6 | 9.6 | 54 |
H21 with rail cover strip · H22 without cover strip.
| Size | Carriage | N1 | N2 | N3 | ØD | S1 | ØS2 | T | T1 | V1 | CN | C0N | MtN·m | Mt0N·m | MLN·m | ML0N·m | Carriagekg | Railkg/m |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | VR53.2 | 10 | 5.3 | 15 | 11 | M8 | 7 | 30 | 20 | 7.5 | 35580 | 75230 | 460 | 980 | 450 | 960 | 0.93 | 3.2 |
| 30 | VR53.7 | 11 | 5.5 | 16 | 14 | M10 | 9 | 40 | 20 | 7.8 | 56480 | 123330 | 960 | 2090 | 830 | 1800 | 1.56 | 4.6 |
| 35 | VR53.3 | 12 | 11 | 19.8 | 15 | M10 | 9 | 40 | 20 | 8 | 66990 | 139320 | 1330 | 2760 | 1090 | 2260 | 2.70 | 6.3 |
| 45 | VR53.4 | 15 | 13.5 | 22.8 | 20 | M12 | 14 | 52.5 | 22.5 | 10 | 116060 | 241480 | 2840 | 5920 | 2330 | 4850 | 5.15 | 10.3 |
| 55 | VR53.5 | 18 | 13.9 | 28.7 | 23 | M14 | 16 | 60 | 30 | 12 | 166600 | 338540 | 4890 | 9950 | 4250 | 8650 | 7.15 | 13.1 |
| 65 | VR53.6 | 23 | 21.5 | 36.5 | 26 | M16 | 18 | 75 | 35 | 15 | 280550 | 534970 | 9910 | 18890 | 8400 | 16000 | 14.18 | 17.4 |

| Size | Carriage | A | A1 | A2 | A3 | L | L1 | E1 | E2 | H | H1 | H21 | H22 | K1 | K2 | K3 | K4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | VR22.2 | 48 | 24 | 23 | 12 | 100.6 | 64.6 | 35 | 35 | 36 | 30.5 | 24.3 | 24 | 22.8 | 5.5 | 6.4 | 20.8 |
| 30 | VR22.7 | 60 | 30 | 28 | 16 | 111.5 | 71.5 | 40 | 40 | 42 | 35.5 | 28.3 | 28 | 23.8 | 6.1 | 5.9 | 22.8 |
| 35 | VR22.3 | 70 | 35 | 34 | 18 | 118 | 79.6 | 50 | 50 | 48 | 41 | 31.1 | 30.80 | 23.4 | 7 | 7 | 21.5 |
| 45 | VR22.4 | 86 | 43 | 45 | 20.5 | 147 | 101.5 | 60 | 60 | 60 | 51 | 39.1 | 38.80 | 30.3 | 8.1 | 8.1 | 27.6 |
| 55 | VR22.5 | 100 | 50 | 53 | 23.5 | 170.7 | 123.1 | 75 | 75 | 70 | 58 | 47.9 | 47.55 | 34.9 | 9 | 8.9 | 30.9 |
| 65 | VR22.6 | 126 | 63 | 63 | 31.5 | 207.3 | 146 | 76 | 70 | 90 | 76 | 58.2 | 57.85 | 52.9 | 9.6 | 9.6 | 50 |
H21 with rail cover strip · H22 without cover strip.
| Size | Carriage | N1 | N3 | ØD | S1 | ØS2 | T | T1 | V1 | CN | C0N | MtN·m | Mt0N·m | MLN·m | ML0N·m | Carriagekg | Railkg/m |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | VR22.2 | 8 | 15 | 11 | M6 | 7 | 30 | 20 | 7.5 | 29300 | 58500 | 380 | 760 | 290 | 570 | 0.53 | 3.2 |
| 30 | VR22.7 | 8 | 16 | 14 | M8 | 9 | 40 | 20 | 7.8 | 45080 | 90000 | 760 | 1520 | 480 | 950 | 0.81 | 4.6 |
| 35 | VR22.3 | 12 | 19.8 | 15 | M8 | 9 | 40 | 20 | 8 | 54100 | 105900 | 1070 | 2100 | 670 | 1310 | 1.55 | 6.3 |
| 45 | VR22.4 | 16 | 22.8 | 20 | M10 | 14 | 52.5 | 22.5 | 10 | 95700 | 185800 | 2340 | 4550 | 1460 | 2840 | 2.90 | 10.3 |
| 55 | VR22.5 | 16 | 28.7 | 23 | M12 | 16 | 60 | 30 | 12 | 132000 | 250800 | 3880 | 7370 | 2430 | 4600 | 4.14 | 13.1 |
| 65 | VR22.6 | 21 | 36.5 | 26 | M16 | 18 | 75 | 35 | 15 | 224900 | 401200 | 7940 | 14170 | 4960 | 8860 | 8.12 | 17.4 |

| Size | Carriage | A | A1 | A2 | A3 | L | L1 | E1 | E2 | H | H1 | H21 | H22 | K1 | K2 | K3 | K4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | VR23.2 | 48 | 24 | 23 | 12 | 117 | 81 | 35 | 50 | 36 | 30.5 | 24.3 | 24 | 23.5 | 5.5 | 6.4 | 21.5 |
| 30 | VR23.7 | 60 | 30 | 28 | 16 | 136 | 96 | 40 | 60 | 42 | 35.5 | 28.3 | 28 | 26 | 6.1 | 5.9 | 25 |
| 35 | VR23.3 | 70 | 35 | 34 | 18 | 142 | 103.6 | 50 | 72 | 48 | 41 | 31.1 | 30.80 | 24.4 | 7 | 7 | 22.5 |
| 45 | VR23.4 | 86 | 43 | 45 | 20.5 | 179.5 | 134 | 60 | 80 | 60 | 51 | 39.1 | 38.80 | 36.5 | 8.1 | 8.1 | 33.8 |
| 55 | VR23.5 | 100 | 50 | 53 | 23.5 | 209.7 | 162.1 | 75 | 95 | 70 | 58 | 47.9 | 47.55 | 44.4 | 9 | 8.9 | 40.4 |
| 65 | VR23.6 | 126 | 63 | 63 | 31.5 | 255.3 | 194 | 76 | 120 | 90 | 76 | 58.2 | 57.85 | 51.9 | 9.6 | 9.6 | 49 |
H21 with rail cover strip · H22 without cover strip.
| Size | Carriage | N1 | N3 | ØD | S1 | ØS2 | T | T1 | V1 | CN | C0N | MtN·m | Mt0N·m | MLN·m | ML0N·m | Carriagekg | Railkg/m |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | VR23.2 | 8 | 15 | 11 | M6 | 7 | 30 | 20 | 7.5 | 35580 | 75230 | 460 | 980 | 450 | 960 | 0.65 | 3.2 |
| 30 | VR23.7 | 8 | 16 | 14 | M8 | 9 | 40 | 20 | 7.8 | 56480 | 123330 | 960 | 2090 | 830 | 1800 | 1.06 | 4.6 |
| 35 | VR23.3 | 12 | 19.8 | 15 | M8 | 9 | 40 | 20 | 8 | 66990 | 139320 | 1330 | 2760 | 1090 | 2260 | 1.95 | 6.3 |
| 45 | VR23.4 | 16 | 22.8 | 20 | M10 | 14 | 52.5 | 22.5 | 10 | 116060 | 241480 | 2840 | 5920 | 2330 | 4850 | 3.65 | 10.3 |
| 55 | VR23.5 | 16 | 28.7 | 23 | M12 | 16 | 60 | 30 | 12 | 166600 | 338540 | 4890 | 9950 | 4250 | 8650 | 5.30 | 13.1 |
| 65 | VR23.6 | 21 | 36.5 | 26 | M16 | 18 | 75 | 35 | 15 | 280550 | 534970 | 9910 | 18890 | 8400 | 16000 | 10.68 | 17.4 |

| Size | Carriage | A | A1 | A2 | A3 | L | L1 | E1 | E2 | H | H1 | H21 | H22 | K1 | K2 | K3 | K4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | VR21.2 | 48 | 24 | 23 | 12 | 100.6 | 64.6 | 35 | 35 | 40 | 34.5 | 24.3 | 24 | 22.8 | 9.5 | 10.4 | 20.8 |
| 30 | VR21.7 | 60 | 30 | 28 | 16 | 111.5 | 71.5 | 40 | 40 | 45 | 38.5 | 28.3 | 28 | 23.8 | 9.1 | 8.9 | 22.8 |
| 35 | VR21.3 | 70 | 35 | 34 | 18 | 118 | 79.6 | 50 | 50 | 55 | 48 | 31.1 | 30.80 | 23.4 | 14 | 14 | 21.5 |
| 45 | VR21.4 | 86 | 43 | 45 | 20.5 | 147 | 101.5 | 60 | 60 | 70 | 61 | 39.1 | 38.80 | 30.3 | 18.1 | 18.1 | 27.6 |
| 55 | VR21.5 | 100 | 50 | 53 | 23.5 | 170.7 | 123.1 | 75 | 75 | 80 | 68 | 47.9 | 47.55 | 34.9 | 19 | 18.9 | 30.9 |
H21 with rail cover strip · H22 without cover strip.
| Size | Carriage | N1 | N3 | ØD | S1 | ØS2 | T | T1 | V1 | CN | C0N | MtN·m | Mt0N·m | MLN·m | ML0N·m | Carriagekg | Railkg/m |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | VR21.2 | 9 | 15 | 11 | M6 | 7 | 30 | 20 | 7.5 | 29300 | 58500 | 380 | 760 | 290 | 570 | 0.62 | 3.2 |
| 30 | VR21.7 | 10 | 16 | 14 | M8 | 9 | 40 | 20 | 7.8 | 45080 | 90000 | 760 | 1520 | 480 | 950 | 0.91 | 4.6 |
| 35 | VR21.3 | 12 | 19.8 | 15 | M8 | 9 | 40 | 20 | 8 | 54100 | 105900 | 1070 | 2100 | 670 | 1310 | 1.85 | 6.3 |
| 45 | VR21.4 | 16 | 22.8 | 20 | M10 | 14 | 52.5 | 22.5 | 10 | 95700 | 185800 | 2340 | 4550 | 1460 | 2840 | 3.35 | 10.3 |
| 55 | VR21.5 | 16 | 28.7 | 23 | M12 | 16 | 60 | 30 | 12 | 132000 | 250800 | 3880 | 7370 | 2430 | 4600 | 5.04 | 13.1 |

| Size | Carriage | A | A1 | A2 | A3 | L | L1 | E1 | E2 | H | H1 | H21 | H22 | K1 | K2 | K3 | K4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | VR24.2 | 48 | 24 | 23 | 12 | 117 | 81 | 35 | 50 | 40 | 34.5 | 24.3 | 24 | 23.5 | 9.5 | 10.4 | 21.5 |
| 30 | VR24.7 | 60 | 30 | 28 | 16 | 136 | 96 | 40 | 60 | 45 | 38.5 | 28.3 | 28 | 26 | 9.1 | 8.9 | 25 |
| 35 | VR24.3 | 70 | 35 | 34 | 18 | 142 | 103.6 | 50 | 72 | 55 | 48 | 31.1 | 30.80 | 24.4 | 14 | 14 | 22.5 |
| 45 | VR24.4 | 86 | 43 | 45 | 20.5 | 179.5 | 134 | 60 | 80 | 70 | 61 | 39.1 | 38.80 | 36.5 | 18.1 | 18.1 | 33.8 |
| 55 | VR24.5 | 100 | 50 | 53 | 23.5 | 209.7 | 162.1 | 75 | 95 | 80 | 68 | 47.9 | 47.55 | 44.4 | 19 | 18.9 | 40.4 |
H21 with rail cover strip · H22 without cover strip.
| Size | Carriage | N1 | N3 | ØD | S1 | ØS2 | T | T1 | V1 | CN | C0N | MtN·m | Mt0N·m | MLN·m | ML0N·m | Carriagekg | Railkg/m |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | VR24.2 | 9 | 15 | 11 | M6 | 7 | 30 | 20 | 7.5 | 35580 | 75230 | 460 | 980 | 450 | 960 | 0.77 | 3.2 |
| 30 | VR24.7 | 10 | 16 | 14 | M8 | 9 | 40 | 20 | 7.8 | 56480 | 123330 | 960 | 2090 | 830 | 1800 | 1.19 | 4.6 |
| 35 | VR24.3 | 12 | 19.8 | 15 | M8 | 9 | 40 | 20 | 8 | 66990 | 139320 | 1330 | 2760 | 1090 | 2260 | 2.35 | 6.3 |
| 45 | VR24.4 | 16 | 22.8 | 20 | M10 | 14 | 52.5 | 22.5 | 10 | 116060 | 241480 | 2840 | 5920 | 2330 | 4850 | 4.45 | 10.3 |
| 55 | VR24.5 | 16 | 28.7 | 23 | M12 | 16 | 60 | 30 | 12 | 166600 | 338540 | 4890 | 9950 | 4250 | 8650 | 6.55 | 13.1 |
The same rail profile serves every carriage type of the series — mounted from above with counterbored holes, or from below with threaded holes.
Counterbored holes for socket-head screws; the holes are closed with plastic or brass plugs, or the whole rail top is covered by a stainless-steel strip. Values are the same for every carriage type of the series.
| Size | A2 | H21 | H22 | ØD | ØS2 | N3 | T | T1 | Railkg/m |
|---|---|---|---|---|---|---|---|---|---|
| 25 | 23 | 24.3 | 24 | 11 | 7 | 15 | 30 | 20 | 3.2 |
| 30 | 28 | 28.3 | 28 | 14 | 9 | 16 | 40 | 20 | 4.6 |
| 35 | 34 | 31.1 | 30.80 | 15 | 9 | 19.8 | 40 | 20 | 6.3 |
| 45 | 45 | 39.1 | 38.80 | 20 | 14 | 22.8 | 52.5 | 22.5 | 10.3 |
| 55 | 53 | 47.9 | 47.55 | 23 | 16 | 28.7 | 60 | 30 | 13.1 |
| 65 | 63 | 58.2 | 57.85 | 26 | 18 | 36.5 | 75 | 35 | 17.4 |
Threaded holes, screwed from below through the machine bed — a closed, smooth rail top with no plugs or cover needed (rail-hole code 4).

| Size | A2 | H2 | LR maxmm | N3 | ØS2 | T | T1 min | T1 | mkg/m |
|---|---|---|---|---|---|---|---|---|---|
| 25 | 23 | 24.00 | 6000 | 12 | M6 | 30.0 | 13 | 13.00 | 3.2 |
| 30 | 28 | 28.00 | 6000 | 15 | M8 | 40.0 | 16 | 18.00 | 4.6 |
| 35 | 34 | 30.80 | 6000 | 15 | M8 | 40.0 | 16 | 18.00 | 6.3 |
| 45 | 45 | 38.80 | 6000 | 19 | M12 | 52.5 | 18 | 24.25 | 10.3 |
| 55 | 53 | 47.55 | 6000 | 22 | M14 | 60.0 | 20 | 28.00 | 13.1 |
| 65 | 63 | 57.85 | 6000 | 25 | M16 | 75.0 | 21 | 35.50 | 17.4 |
LR max as listed in the catalogue rail table (6000 mm). T1 recommended, tolerance ± 0.5 mm.
VR51 · size 35 · C1 · accuracy H · 2 carriages per rail · L = 1240 mm · 2 rails · end holes 20/20 mm. The orange part is required; the grey options (rail holes and segments, carriage protection, pre-lubrication and fitting, seal kit, special requirements) are agreed with our sales team.
Type · size code · preload · accuracy
Protection · size code · accuracy · length
| Accuracy class | C1 | C2 | C3 |
|---|---|---|---|
| H — high (code 3) | check_circle | check_circle | — |
| P — precision (code 2) | check_circle | check_circle | — |
| SP — super precision (code 1) | — | check_circle | check_circle |
| UP — ultra precision (code 0) | — | check_circle | check_circle |
Size codes: 2 = 25 · 7 = 30 · 3 = 35 · 4 = 45 · 5 = 55 · 6 = 65.
| Field | Meaning |
|---|---|
| VR | Series — roller guide |
| 0 | Rail corrosion protection: 0 oiled · 1 hard chrome · 2 black chrome · 3 nickel · 4 black oxide · 5 stainless steel |
| 51 | Carriage type (51, 53, 22, 23, 21, 24) |
| 3 | Size code: 2 = 25 · 7 = 30 · 3 = 35 · 4 = 45 · 5 = 55 · 6 = 65 |
| 1 | Preload code: 1 = C1 · 2 = C2 · 3 = C3 |
| 3 | Accuracy code: 0 = UP · 1 = SP · 2 = P · 3 = H |
| 2 | Carriages per rail |
| 1240 | Rail length in mm |
| Ⅱ | Rails used together (Ⅰ, Ⅱ, Ⅲ …) |
| 20/20 | End-hole distances, left / right, seen with the rail reference side towards you |
| 3 1 0 | Rail holes & cover · number of rail segments · carriage corrosion protection |
| 1 01 | Factory pre-lubrication · lube fitting |
| KK | Seal kit (blank = standard) |
| E | Special requirements — specified in writing |
The inquiry builder offers only the accuracy / preload combinations that exist, works out symmetric end-hole distances for your rail length and sends the code with your options.
| 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; measured at the carriage centre.
| Preload class | Recommended for |
|---|---|
| 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. |
Preload raises rigidity and is included in the service-life calculation; it should not exceed one third of the bearing load. With vibration, choose C2 or C3.
Send us the axis — load, stroke, speed, mounting and required accuracy. We return the order code, a service-life estimate and the dimension drawing.