Airtac LSH Linear Guide Rail LSH25BK-F1L-N-D-M6
The AirTAC Airtac LSH Linear Guide Rail LSH25BK-F1L-N-D-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-F1L-N-D-M6
The LSH25BK-F1L-N-D-M6 is a single long-body top-flange carriage for the AirTAC LSH25 profile-rail system, normal accuracy grade, pairing code D. It arrives alone: there is no rail in the box, and no preload setting either, because preload is a property of the matched set. Four rows of recirculating balls at a 45 degree contact angle carry loads from all four directions and self-align within the catalogue tolerances, so a slightly imperfect mounting face will not seize the block. Remember the rail under a size 25 block is 23 mm wide.
As a repair part this block makes economic sense: a carriage-only purchase typically costs about a quarter of a complete matched set, provided the rail is undamaged and you know its pairing code. The numbers: 32.9 kN dynamic C, 53.0 kN static C0 and moment ratings of 0.58 / 0.57 / 0.57 kN.m for MR / MP / My. Re-grease through the M6 nipple with 1.4 cm3 of Mobilux EP2 or equivalent after every 100 km of travel.
Airtac LSH Linear Guide Rail LSH25BK-F1L-N-D-M6 Technical Specifications
| Model | Airtac LSH Linear Guide Rail LSH25BK-F1L-N-D-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 | 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-F1L-N-D-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-F1L-N-D-M6 Is Used
Benchtop mill slide rebuild
A small milling machine's X-slide carriage scores after coolant contamination. Replacing just the block costs roughly a quarter of a new matched set; order pairing code D to match the original rail.
Parcel-hub sorting gate carriage
Sorting gates cycle hundreds of thousands of times a season. Carrying 53.0 kN static capacity, this long body shrugs off gate-slam shock better than the standard-length block it replaces.
Welding-cell fixture slider
A clamp fixture that slides into the weld position runs on two LSH25 rails. This F1 top-flange block bolts down from above, so the fixture plate below can stay solid and un-drilled through.
Is the Airtac LSH Linear Guide Rail LSH25BK-F1L-N-D-M6 the Right Guide?
Work through the match in this order. Form first: this is a carriage only, so you need an existing LSH25 rail - and its pairing code must read D, or the block will not pair with it. Size by both load and moment: C 32.9 kN covers most mid-size automation, but if the load overhangs, check MR 0.58 kN.m first. When a smaller frame would do, consider LRM for light duty (its ratings are not published; we confirm them by enquiry). When the travel is short and crossed-roller stiffness beats recirculating-ball smoothness, LGC is the alternative to quote.
Also fix these before ordering: F1 top-flange mounting holes, long body length, one block per rail unless your layout uses two, accuracy N, and the M6 nipple, which is the correct fitting family for sizes 20 to 35.
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-F1L-N-D-M6 FAQ
For the LSH25 long carriage at normal accuracy: dynamic rating C 32.9 kN, static rating C0 53.0 kN, allowable static moments MR 0.58 kN.m, MP 0.57 kN.m, My 0.57 kN.m. Running parallelism at N grade spans 12-37 um across the rail length range. The rail underneath takes M6 screws torqued to 1370 / 921 / 686 N.cm for steel, cast iron and aluminium respectively. Lubrication through the M6 nipple: 1.4 cm3 per top-up after the initial 4.5 cm3 charge, repeated every 100 km of travel or 3 to 6 months.
Yes, if three things check out. The rail must be an LSH25 rail whose pairing code is D, matching this block; the rail raceways must be sound, since a scored rail will wear a new block fast; and the mounting faces must meet the size 25 shoulder limits (H 6.5, H1 5, H2 5 mm, corner radius under 1 mm). Note the rail is 23 mm wide, not 25, and that no rail or preload comes with this carriage-only purchase.
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 LSH25BK-F1L-N-D-M6
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.