Airtac LSH Linear Guide Rail LSH25F2N2X340S20BH-M6
The AirTAC Airtac LSH Linear Guide Rail LSH25F2N2X340S20BH-M6 is a standard-type profile linear guide on a 23 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
- SizeLSH25
- Rail width23 mm
- Carriage lengthStandard carriage
- Carriages2
- Rail length340 mm
- AccuracyH — high grade
- PreloadB — light 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 LSH25F2N2X340S20BH-M6
A short, stiff linear axis: one 340 mm rail at the true 23 mm width of size 25 carries two standard-length F2 carriages bolted up from underneath. Mounting from below leaves the whole top face of each block free, which matters on crowded fixture plates. The four-row ball circuit runs at 45 degree X-arranged contact, two points per ball, so a load pushing down, lifting up or sideways all meet the same rating figure, and internal self-alignment soaks up minor flatness faults in the base plate without the blocks binding.
Each block is rated 26.9 kN dynamic and 39.4 kN static, with 0.44 kN.m MR and 0.38 kN.m MP and My. Two blocks only 340 mm apart make this set far stronger against pitch and yaw than any single carriage of the same size, which is the whole point of the configuration. Accuracy is H grade with a 7-28 um parallelism band, and light preload sets the installation limits at 22 um parallel and 85 um height error at 500 mm spacing, scaling with the actual distance between the blocks.
Airtac LSH Linear Guide Rail LSH25F2N2X340S20BH-M6 Technical Specifications
| Model | Airtac LSH Linear Guide Rail LSH25F2N2X340S20BH-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 | LSH25 |
| Rail width | 23 mm (the size code is not the rail width above size 20) |
| Carriage style | Flange, bottom mounting |
| Carriage length | Standard carriage |
| Carriages supplied | 2 |
| Rail length | 340 mm |
| Basic dynamic load rating C | 26.9 kN per carriage |
|---|---|
| Basic static load rating C0 | 39.4 kN per carriage |
| Allowable static moment | MR 0.44 / MP 0.38 / My 0.38 kN·m |
| Accuracy grade | H — high grade |
| Preload grade | B — light preload |
| Mounting screws | M6 — 1370 N·cm into steel, 921 cast iron, 686 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 LSH25F2N2X340S20BH-M6
| LSH | LSH Series Linear Guide. |
|---|---|
| 25 | Size code — note the rail is 23 mm wide, not 25 mm. |
| H / F1 / F2 / F3 | Carriage style: square, or flange mounted from the top, bottom, or both. |
| N | Standard carriage. |
| 2X340 | 2 carriages on a 340 mm rail. |
| S… | End-hole offset from the rail end, in mm. |
| B | B — light preload — higher preload raises rigidity and tightens how flat the mounting surface must be. |
| H | H — high 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, 340 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 LSH25F2N2X340S20BH-M6 Is Used
Welding jig fixture slide
A clamped subassembly slides between loading and welding stations; the bottom-flange blocks bolt through the jig base plate, leaving the top surface unobstructed for clamps.
Packaging infeed pusher
A pusher bar crossing a conveyor lane rides two closely spaced blocks on a 340 mm rail, resisting the twist when the bar meets a product off-centre.
Workshop router rebuild
Replacing a worn complete guide assembly on a benchtop CNC router: the F2 flange suits a bolted-from-below mount, and a matching carriage later costs about a quarter of a full set, making repair the economical route while the new rail stays sound.
Is the Airtac LSH Linear Guide Rail LSH25F2N2X340S20BH-M6 the Right Guide?
Size this axis on both numbers: dynamic load for travel life and the moment ratings for any overhung payload. Two closely spaced blocks handle tipping well, but if the payload still overhangs badly, either space the blocks wider on a longer rail or take the long carriage with its 0.58 kN.m MR. A light, compact axis with a smaller envelope is LRM territory; we confirm its ratings case by case because the catalogue publishes none. Short-travel work wanting crossed-roller rigidity points to LGC instead. When ordering, verify the form (this is the complete set), size, flange type and length, block count, rail length, accuracy and preload against your mounting tolerance, the M6 grease fitting, and the pairing code when matching an existing part.
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 LSH25F2N2X340S20BH-M6 FAQ
Per standard carriage: dynamic 26.9 kN, static 39.4 kN, moments 0.44 kN.m MR, 0.38 kN.m MP and My; two carriages ship on this rail. Running parallelism sits in the 7-28 um band for H grade. Rail screws are M6 at 1370, 921 and 686 N.cm for steel, cast iron and aluminium bases. Grease per carriage: 3.6 cm3 first fill, 1.1 cm3 top-up, re-grease after 100 km of travel or 3 to 6 months, whichever is sooner.
Two blocks spaced along 340 mm take pitch and yaw moments through a wider footprint than any single carriage of this size, while each still carries its own 26.9 kN dynamic rating. The trade-off is installation discipline: light preload tightens the limits to 22 um parallel and 85 um height error at 500 mm spacing, scaling with the actual block distance, and the bolt caps must be driven flush into the rail or swarf reaches the ball circuit. If the rail ever wears, a replacement carriage is found via the pairing code and costs roughly a quarter of a full set.
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 LSH25F2N2X340S20BH-M6
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.