Airtac LSH Linear Guide Rail LSH25BK-F1N-N-B-M6
The AirTAC Airtac LSH Linear Guide Rail LSH25BK-F1N-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 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-B-M6
This listing is a single carriage, not a guide: the AirTAC LSH25BK-F1N-N-B-M6 flange block in the normal accuracy grade, pairing code B, with an M6 grease nipple. Nothing else comes in the box. The N grade trades a little precision for economy - its running parallelism band is 12-37 um against 7-28 um for the H grade - which is ample for general automation where the machine's own datum sets the tolerance. Four rows of balls ride X-arranged 45 degree arc raceways, so the block takes downward, side and lift-off loads equally and self-aligns over small mounting-surface errors.
Capacity is identical to the high-accuracy twin: C 26.9 kN dynamic, C0 39.4 kN static, moments MR 0.44, MP 0.38 and My 0.38 kN.m - the accuracy letter changes precision, never strength. The F1 top flange takes its bolts from above onto the mating plate, and the paired rail's true width is 23 mm, which - unlike the size code 25 - is the figure to use when laying out the datum.
Airtac LSH Linear Guide Rail LSH25BK-F1N-N-B-M6 Technical Specifications
| Model | Airtac LSH Linear Guide Rail LSH25BK-F1N-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, 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-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. |
| 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-B-M6 Is Used
Display-panel transfer line
An electronics plant moves glass panels on vacuum arms riding B-paired blocks along a shared datum. The normal grade's 12-37 um band sits well inside what the overhead frame defines, keeping cost sensible across dozens of axes.
Test rig counterweight slide
A university structures lab builds a reaction frame whose counterweight slide needs dependable capacity, not sub-10 um precision - C 26.9 kN per block and a top flange that bolts straight to the frame plate fit the brief.
Workshop press retrofit
A job-shop converts a manual arbor press to a guided servo press, buying this carriage and a B-coded rail separately. Because the block alone costs about a quarter of a full set, later replacements stay cheap.
Is the Airtac LSH Linear Guide Rail LSH25BK-F1N-N-B-M6 the Right Guide?
Normal grade is the right call wherever the machine frame, not the guide, sets the final tolerance - conveyors, workholding slides, material handling. Budget the mating surfaces carefully anyway: whether the rail is pulled flat to its datum face and torqued correctly has a large effect on achieved accuracy at any grade. Sizing both ways: drop to LRM for light loads in small envelopes (ratings not published - we confirm them for you), and step up when moment governs, since an LSH30 block reaches MR 0.66 kN.m against this block's 0.44, while the LSH25L long carriage offers 0.58 kN.m on the same rail. LGC suits short travels that need crossed-roller stiffness. Order checklist: confirm carriage-only form, load and moment, F1 flange standard length, block count and rail length, N accuracy, M6 fitting, and pairing letter B shared with the rail. Preload is set on complete sets, where grades B and C add rigidity but tighten the permitted mounting error - on an LSH25 set, medium preload cuts the allowable height error from 130 um to 70 um, so rigidity is not free.
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-B-M6 FAQ
Dynamic rating C 26.9 kN and static C0 39.4 kN per carriage; moments MR 0.44, MP 0.38 and My 0.38 kN.m. Running parallelism for grade N is 12-37 um across the rail length bands. The rail this block runs on clamps with M6 screws at 1370, 921 and 686 N.cm on steel, cast iron and aluminium respectively. Grease: Mobilux EP2, 3.6 cm3 first charge, 1.1 cm3 top-up, refreshed every 100 km of travel or every 3 to 6 months.
One carriage - the block alone, with no rail. The B pairing letter must match the letter on your LSH25 rail; AirTAC marks both so a carriage keeps its smoothness, preload and accuracy on any same-model rail carrying the same letter. Replacing a block? The letter sits in the original part's ordering code - read it there instead of measuring.
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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-F1N-N-B-M6
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