Airtac LSH Linear Guide Rail LSH25BK-F2L-N-B-M6
The AirTAC Airtac LSH Linear Guide Rail LSH25BK-F2L-N-B-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 asCarriage / block only
- SizeLSH25
- Rail width23 mm
- Carriage lengthLong carriage
- AccuracyN — normal grade
- 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 LSH25BK-F2L-N-B-M6
A single LSH25 carriage, accuracy grade N, long F2 flange body, M6 lubrication port, pairing code B, and no rail: that is exactly what LSH25BK-F2L-N-B-M6 is and all it is. The flange sits beneath the block, so fixings approach from underneath the mounting plate and the top face stays clear for tooling, guards or the workpiece. Inside, four rows of balls bear on X-arranged 45 degree arc grooves with two contact points per ball, giving equal capacity in all four directions and enough self-alignment to tolerate small datum errors within the catalogue's allowable values.
Accuracy grade N suits general machine building; if the axis was built on H or P grade rails, keep the replacement to that grade so both sides of the machine run alike. Ratings for this long block: C 32.9 kN, C0 53.0 kN, moments 0.58 / 0.57 / 0.57 kN.m (MR / MP / My). Lubrication is where long carriages live or die: 4.5 cm3 first charge, 1.4 cm3 top-ups, re-grease every 100 km of travel or every 3 to 6 months, and stroke the block at least three carriage lengths after greasing until an even film shows.
Airtac LSH Linear Guide Rail LSH25BK-F2L-N-B-M6 Technical Specifications
| Model | Airtac LSH Linear Guide Rail LSH25BK-F2L-N-B-M6 |
|---|---|
| Series | LSH Series Linear Guide |
| Supplied as | Carriage / block only |
| 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 | Long carriage |
| Basic dynamic load rating C | 32.9 kN per carriage |
|---|---|
| Basic static load rating C0 | 53.0 kN per carriage |
| Allowable static moment | MR 0.58 / MP 0.57 / My 0.57 kN·m |
| Accuracy grade | N — normal grade |
| 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, matched by the pairing code |
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. This item is a carriage only. Order a complete set if you also need a rail.
Model Code: Airtac LSH Linear Guide Rail LSH25BK-F2L-N-B-M6
| LSH | LSH Series Linear Guide. |
|---|---|
| 25 | Size code — note the rail is 23 mm wide, not 25 mm. |
| BK | Carriage / block only — no rail supplied. |
| H / F1 / F2 / F3 | Carriage style: square, or flange mounted from the top, bottom, or both. |
| L | Long carriage. |
| N | N — normal grade. |
| Pairing code | Rails and carriages must share a pairing code. Take it from the original part when replacing. |
| -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 | Carriage / block only |
|---|---|
| Rail | No — not supplied with this item |
| Carriage | Yes, one |
This is a carriage on its own. NO RAIL IS INCLUDED. 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 LSH25BK-F2L-N-B-M6 Is Used
Food-line gate lift upgrade
A bakery line's diverter gate slides on two bottom-fixed blocks so no fixing heads stand proud where dough dust collects. The plant standardises on this long N-grade carriage for gate axes and keeps two as spares.
Measuring machine axis rebuild
A traversing probe stand on a inspection bench is re-blocked with a single long carriage. Grade N accuracy and the self-aligning X-geometry keep the stand tracking the 23 mm rail within the 12 to 37 um parallelism band.
Indexing fixture slide upgrade
An engineer upgrades a manual indexing fixture to a sliding clamp plate, bolting the F2 flange from below the table so the clamp surface above stays flat and uninterrupted. The M6 port allows greasing without dismantling.
Is the Airtac LSH Linear Guide Rail LSH25BK-F2L-N-B-M6 the Right Guide?
This carriage-only code is for upgrading or replacing a block on a rail you already trust. Size it on load and moment: 32.9 kN dynamic covers a lot of general machinery at size 25, but check the 0.58 kN.m MR against any overhung load. Lighter, compact duties may step down to LRM; its ratings are not published, so we confirm them case by case. Heavier moment duties step up to LSH30 or to a two-carriage arrangement, and short-travel jobs needing crossed-roller rigidity belong with LGC. Run through the list: carriage only form, size against load and moment, F2 flange with fixings from below, long carriage, accuracy N, M6 fitting, and pairing code B shared with the rail.
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 LSH25BK-F2L-N-B-M6 FAQ
Key figures for this LSH25 long carriage: C 32.9 kN dynamic, C0 53.0 kN static, and moment ratings MR 0.58, MP 0.57, My 0.57 kN.m. N grade accuracy gives running parallelism of 12 to 37 um across the rail-length bands. The rail beneath it is 23 mm wide and takes M6 screws torqued to 1370 / 921 / 686 N.cm in steel, cast iron and aluminium respectively. First grease charge 4.5 cm3, top-up 1.4 cm3, interval 100 km of travel or 3 to 6 months; after greasing, cycle the block three carriage lengths or more, twice, and confirm an even film on the rail.
The box holds one long bottom-flange carriage and nothing else; there is no rail, and this code must never be quoted as a complete guide or matched set. What makes carriage-only ordering safe is the pairing code, the final letter, B here: your rail must carry the same letter for the pair to be matched. If the old block is unreadable, the rail's end face usually carries the code stamp. A caution for fitting: the mounting-surface corner radius at the rail must not exceed 1 mm on size 25, and whether the rail is pulled flat against its datum and torqued correctly has a large effect on the accuracy you finally get.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
Request a Quote for Airtac LSH Linear Guide Rail LSH25BK-F2L-N-B-M6
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