Airtac LSH Linear Guide Rail LSH25BK-F2N-N-D-M6
The AirTAC Airtac LSH Linear Guide Rail LSH25BK-F2N-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 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-F2N-N-D-M6
Order this code and you receive one AirTAC LSH25 bottom-flange carriage, F2 style, standard length, normal accuracy, with an M6 grease nipple and pairing code D. It is a replacement part, not a set: there is no rail and no mounting hardware in the box. The block rides the rail on four ball rows set at a 45 degree contact angle in crossed arc grooves, giving equal capacity whichever way the load pushes, with enough internal compliance to forgive slight surface errors.
The economics favour part replacement. A carriage on its own lists at roughly a quarter of a complete set, so when a D-coded rail is still straight and clean, renewing the block is the cheaper repair. This size delivers 26.9 kN dynamic and 39.4 kN static per carriage, with a 0.44 kN.m MR moment - figures that suit mid-size machine slides rather than light gantries.
Airtac LSH Linear Guide Rail LSH25BK-F2N-N-D-M6 Technical Specifications
| Model | Airtac LSH Linear Guide Rail LSH25BK-F2N-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, bottom 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-F2N-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. |
| 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-F2N-N-D-M6 Is Used
Milling machine axis rebuild
During a rebuild of a knee mill's servo X-axis, the original blocks are often brinelled after years of duty. Fresh D-coded carriages bolt to the saddle from beneath, and the rebuilt axis runs on its existing rails.
Bottling line changeover slide
A star-wheel adjuster on a bottling line repositions quickly between bottle sizes. Greasing at the M6 nipple every 100 km or 3 to 6 months keeps the slide free, and a D-coded carriage held as a spare cuts the stop when one finally wears.
Parcel conveyor diverter gate
The diverter gate on a parcel conveyor slides on a size 25 guide. Bottom-flange mounting hides the fixings under the gate plate, and the 39.4 kN static rating absorbs the shock when a jam stops the gate dead.
Is the Airtac LSH Linear Guide Rail LSH25BK-F2N-N-D-M6 the Right Guide?
Start from the failure, not the catalogue. If the rail shows corrosion pits, score marks or a visible dip, replace the complete set, because a fresh carriage on a damaged rail inherits the damage. If the rail is sound, this carriage renews the guide at a fraction of set cost. Light duty in a small envelope steps down to LRM, whose load ratings are unpublished, so we confirm them for you. When the 0.44 kN.m MR needs to grow, the long LSH25L body reaches 0.58 kN.m, and LGC suits short strokes where crossed-roller stiffness beats long recirculating travel. Checklist: carriage only, size 25, F2 bottom flange, standard length, N accuracy, M6 nipple, pairing code D.
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-F2N-N-D-M6 FAQ
Per carriage: 26.9 kN dynamic C, 39.4 kN static C0, moments of 0.44 kN.m MR and 0.38 kN.m MP and My. Assembled with a normal grade rail, running parallelism sits in the 12-37 um band by rail length. Rail screws are M6 at 1370 / 921 / 686 N.cm on steel, cast iron and aluminium. Lubrication is Mobilux EP2 or equivalent: 3.6 cm3 first charge, 1.1 cm3 top-up, renewed every 100 km or 3 to 6 months. A 300 mm stroke cycling once a second covers 100 km in roughly two weeks of continuous running, so the distance limit usually binds before the calendar does.
One bottom-flange carriage, standard length, normal accuracy, M6 nipple. No rail is supplied, and the code is not a complete guide. The pairing letter D is the fit key: LSH rails and carriages carry matching codes, and a D carriage is meant for a D rail. If your rail's code differs, order the carriage with that code instead - mixing codes gives up the rated running quality. The carriage code carries no preload position either, so check what your original set specified before fitting.
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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-F2N-N-D-M6
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.