Airtac LSH Linear Guide Rail LSH25BK-F1N-N-C-M6
The AirTAC Airtac LSH Linear Guide Rail LSH25BK-F1N-N-C-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 lengthStandard 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-F1N-N-C-M6
This listing is the carriage only - a single AirTAC LSH25 block in the F1 top-flange pattern, standard length, normal accuracy, M6 grease fitting. No rail is included and none is described by this code. Four rows of recirculating balls run in X-set arc raceways cut at 45 degrees, two contact points per ball, so thrust is carried equally in every direction and slight mounting-surface error is absorbed inside the block instead of binding it. Size 25 rails measure 23 mm wide, not 25 - verify that before machining the mounting plate.
Per block, the catalogue rates this standard-length size 25 carriage at 26.9 kN dynamic and 39.4 kN static, with moment limits of 0.44 kN.m MR, 0.38 kN.m MP and 0.38 kN.m My. Static sits at roughly one and a half times dynamic across the whole range, so size on C for travel life rather than on the bigger C0. The block is pre-filled with Mobilux EP2 and takes an M6 fitting; note that side-mounted nipples are not recommended on flange blocks like this F1 because the fitting can foul the carriage body.
Airtac LSH Linear Guide Rail LSH25BK-F1N-N-C-M6 Technical Specifications
| Model | Airtac LSH Linear Guide Rail LSH25BK-F1N-N-C-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, top mounting |
| Carriage length | Standard carriage |
| 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 | 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-F1N-N-C-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. |
| N | Standard 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-F1N-N-C-M6 Is Used
Plasma table gantry rebuild
A fabrication shop replacing the seized blocks on a CNC plasma cutting table's gantry beam orders this C-coded block to match the existing 23 mm rails, then torques the M6 flange screws to 1370 N.cm on the steel beam.
SMT pallet transfer cart
An electronics plant keeps spare F1 blocks for the transfer carts ferrying PCB carriers between reflow ovens; fitting one new block restores smooth travel without disturbing the mounted rail.
Bottling line inspection bridge
A fill-height camera bridge gliding across a bottling line gets a fresh block after grease starvation, the four-row 45 degree ball geometry re-centering the optics over the bottle necks.
Is the Airtac LSH Linear Guide Rail LSH25BK-F1N-N-C-M6 the Right Guide?
Buying as a replacement? Match five things off the old part: size 25 (23 mm rail width), the F1 top-flange footprint, standard length, M6 fitting and above all the pairing letter - C here. Your rail must carry the same letter. If the failed block shows flaking or ball-indent marks, the rail raceways are usually damaged too, and a fresh block on a scored rail will not survive; budget for a complete set in that case. At roughly a quarter of the price of a full guide, the block is the economic repair only when the rail is sound.
For lighter duties in a slimmer envelope, step down to AirTAC LRM - its load ratings are not published, so we confirm them against your application. Short travels needing crossed-roller stiffness point across to LGC. If moment governs instead, a long size 25 block lifts MR from 0.44 to 0.58 kN.m, about 32 percent, against only about 22 percent more dynamic capacity. Checklist before ordering: form (carriage only), size by load AND moment, flange style and length, block count and rail length, accuracy and preload grade with the installation trade-off it carries, grease fitting, pairing code.
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-F1N-N-C-M6 FAQ
Dynamic C 26.9 kN and static C0 39.4 kN per carriage; moments MR 0.44, MP 0.38, My 0.38 kN.m. As N grade, running parallelism falls in the 12-37 um band, the exact value depending on rail length. Rail screws are M6, torqued to 1370 N.cm on steel, 921 on cast iron, 686 on aluminium. Grease: 3.6 cm3 first charge, 1.1 cm3 top-up per block, refreshed every 100 km of travel or every 3 to 6 months. This code covers the block only - the rail it fits is lettered C.
No. LSH25BK is a carriage-only code: one F1 top-flange block with an M6 fitting, nothing else in the box. AirTAC marks LSH25 rails and blocks with a pairing letter so a replacement keeps the original smoothness, preload and accuracy; your rail must be lettered C to accept this block. Preload is never stated in a carriage code - it comes into existence when this block is mated to a rail of the corresponding grade.
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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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