Airtac LSH Linear Guide Rail LSH20HN2X255S7.5AN-M6
The AirTAC Airtac LSH Linear Guide Rail LSH20HN2X255S7.5AN-M6 is a standard-type profile linear guide on a 20 mm wide rail. Four rows of balls contact X-shaped raceways at a 45° angle, so the guide carries load equally in all four directions and absorbs small mounting errors inside the carriage instead of binding.
- SeriesLSH
- Supplied asComplete guide set
- SizeLSH20
- Rail width20 mm
- Carriage lengthStandard carriage
- Carriages2
- Rail length255 mm
- AccuracyN — normal grade
- PreloadA — no preload
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac LSH Linear Guide Rail LSH20HN2X255S7.5AN-M6
LSH20HN2X255S7.5AN-M6 is the compact end of the LSH range: a 255 mm size 20 rail with two square standard carriages riding on it, normal accuracy and no preload. The 7.5 mm end offset puts the first mounting hole close to the rail end, which helps where every millimetre of a small baseplate counts. As in every LSH carriage, four ball rows meet X-shaped 45 degree arc raceways, giving equal rating in all four directions and letting the block take up slight mounting misalignment internally.
A short rail changes the maintenance maths more than the load maths. The ratings stay at 18.6 kN dynamic, 28.6 kN static and 0.27/0.25/0.25 kN.m of moment per block, but a 100 mm stroke cycling once a second covers the 100 km re-grease distance in under six days of continuous running, so on fast short-stroke axes the calendar interval never gets a word in; plan on 0.6 cm3 top-ups per block and let the cycle counter, not the wall calendar, set the schedule.
Airtac LSH Linear Guide Rail LSH20HN2X255S7.5AN-M6 Technical Specifications
| Model | Airtac LSH Linear Guide Rail LSH20HN2X255S7.5AN-M6 |
|---|---|
| Series | LSH Series Linear Guide |
| Supplied as | Complete guide set |
| Construction | Recirculating ball, four ball rows on X-shaped raceways at a 45° contact angle, self-aligning |
| Size code | LSH20 |
| Rail width | 20 mm |
| Carriage style | Square (compact) |
| Carriage length | Standard carriage |
| Carriages supplied | 2 |
| Rail length | 255 mm |
| Basic dynamic load rating C | 18.6 kN per carriage |
|---|---|
| Basic static load rating C0 | 28.6 kN per carriage |
| Allowable static moment | MR 0.27 / MP 0.25 / My 0.25 kN·m |
| Accuracy grade | N — normal grade |
| Preload grade | A — no preload |
| Mounting screws | M5 — 882 N·cm into steel, 588 cast iron, 441 aluminium |
| Lubrication | Pre-filled with Mobilux EP2; re-grease every 100 km of travel or every 3–6 months |
| Interchangeability | LSH carriages fit LSH rails of the same model |
Specifications follow the official AirTAC LSH catalogue. The catalogue page does not state the carriage or rail base material. Sizes 35 and 45 exist in the catalogue but are not stocked here; they are available to order.
Model Code: Airtac LSH Linear Guide Rail LSH20HN2X255S7.5AN-M6
| LSH | LSH Series Linear Guide. |
|---|---|
| 20 | Size code. |
| H / F1 / F2 / F3 | Carriage style: square, or flange mounted from the top, bottom, or both. |
| N | Standard carriage. |
| 2X255 | 2 carriages on a 255 mm rail. |
| S… | End-hole offset from the rail end, in mm. |
| A | A — no preload — higher preload raises rigidity and tightens how flat the mounting surface must be. |
| N | N — normal grade. |
| -M4 / -M6 / -A01… | Grease nipple or tube-fitting type. Restricted by size: size 15 the M4 family, 20–35 the M6 family, 45 the PT1/8 family. |
What Is In The Box
| This order | Complete guide set |
|---|---|
| Rail | Yes, 255 mm |
| Carriage | Yes, 2 |
Rail and carriage(s) supplied together, matched as a set. If you are not sure which form you need, send us the machine or the original part number and we will confirm it before you order.
Where the Airtac LSH Linear Guide Rail LSH20HN2X255S7.5AN-M6 Is Used
Compact gantry retrofit
A small CNC or 3D printer rebuild where the Y axis needs only about 180 mm of stroke; two blocks on one short rail keep the gantry bridge square without a long bed.
Jig slide for fixture work
A workshop jig positioning a drilled part under a bench press; the 7.5 mm end offset lets the rail sit flush with the jig edge and keeps the end-stop screws clear.
Fast short-stroke feed unit
A cam-following or feed-finger unit cycling a 100 mm stroke several times a second; the 100 km re-grease distance arrives within days, so the machine counts cycles rather than months.
Is the Airtac LSH Linear Guide Rail LSH20HN2X255S7.5AN-M6 the Right Guide?
A 255 mm rail suits strokes of roughly 150 to 200 mm; for anything longer, order a longer rail under the same code pattern rather than driving the carriages to the rail ends. If the load is light and the envelope still too tight, LRM is the smaller series - its load ratings are not published, so we confirm suitability with you directly. If travel is very short and stiffness matters more than recirculating life, LGC crossed rollers are the stronger match; and if a cantilever overloads the 0.27 kN.m moment of one block, a long LSH20 carriage (0.35 kN.m) or a step to LSH25 (0.44 kN.m) fixes it.
Confirm before ordering: form (this is the complete set), size by load and moment, carriage style and length, block count and rail length, accuracy and preload against the tolerances you can actually machine, grease fitting, and the pairing code when replacing a part on an existing axis.
Quick checklist
- ✓ Complete set, carriage only, or rail only?
- ✓ Worst-case moment, not just straight load
- ✓ Travel length and mounting space
- ✓ Accuracy grade and preload
- ✓ Mounting surface ground or finish-milled
- ✓ Pairing code, if replacing a part
Installation & Maintenance Notes
- check Mounting surface must be ground or finish-milled.
- check Torque the rail screws per the recommended figures, in sequence.
- check Keep the mounting corner radius inside the stated R maximum.
- check Do not angle the carriage onto the rail; balls can drop out.
- check Drive the supplied bolt caps into the mounting holes.
- check Re-grease every 100 km of travel or every 3–6 months.
- check Installation by qualified personnel per AirTAC docs.
Airtac LSH Linear Guide Rail LSH20HN2X255S7.5AN-M6 FAQ
Per block: dynamic C 18.6 kN, static C0 28.6 kN, moments MR 0.27, MP 0.25 and My 0.25 kN.m. Grade N rails hold 12-37 um running parallelism depending on length. Use M5 rail screws at 882 / 588 / 441 N.cm for steel, cast iron and aluminium bases. Grease: 1.8 cm3 first charge and 0.6 cm3 top-up per block, repeated every 100 km of travel or every 3 to 6 months, whichever comes first.
The complete set: one 255 mm rail, two square carriages mounted on it, the M6 tube fitting and bolt caps for the screw holes. The carriages are interchangeable within LSH20 - a spare block runs on this rail with the same smoothness, preload and accuracy - but only against the matching pairing code, so note the code from the original part when ordering a replacement. The blocks arrive pre-filled with Mobilux EP2; after mounting, stroke each one three carriage-lengths, twice, and confirm an even film on the rail before running.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac LSH Linear Guide Rail LSH20HN2X255S7.5AN-M6
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.