Airtac LSH Linear Guide Rail LSH25BK-F1N-P-B-M6
The AirTAC Airtac LSH Linear Guide Rail LSH25BK-F1N-P-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
- AccuracyP — precision 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-P-B-M6
A precision-grade spare block, sold on its own: AirTAC LSH25 carriage, F1 top-flange mounting, standard length, P accuracy, M6 fitting, pairing letter B. No rail forms part of this order. The P grade narrows running parallelism to a 3-21 um band - against 12-37 um for normal grade - which is exactly why this block is the one to hold as a spare for measuring and inspecting machines. Size 25 rails are 23 mm wide; do not lay out a mounting pad from the size code alone.
Ratings are untouched by the accuracy grade: 26.9 kN dynamic, 39.4 kN static, 0.44/0.38/0.38 kN.m MR/MP/My per block. What P costs is installation care - the tighter the grade, and the tighter any preload on the mated rail, the less mounting error the pair forgives, so datum flatness and correct M6 screw torque matter more on this block than on an N-grade line.
Airtac LSH Linear Guide Rail LSH25BK-F1N-P-B-M6 Technical Specifications
| Model | Airtac LSH Linear Guide Rail LSH25BK-F1N-P-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 | P — precision 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-P-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. |
| P | P — precision 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-P-B-M6 Is Used
Lab metrology stage
A materials lab's profilometer stage keeps a B-coded P-grade spare so a damaged block can be exchanged without re-qualifying the 3-21 um straightness of the measurement axis.
Vision inspection gantry
On an electronics fab's overhead vision gantry, a precision block replacement preserves camera-to-panel repeatability where a normal-grade swap would drift by tens of um over the stroke.
Encoder scale slider
A machine tool retrofit slides its linear encoder scale on size 25 P-grade blocks; renewing the block restores the sub-10 um alignment the scale reading head expects.
Is the Airtac LSH Linear Guide Rail LSH25BK-F1N-P-B-M6 the Right Guide?
Swap precision for precision: a machine built on P-grade rails deserves a P-grade replacement block, and the pairing letter B must match the rail. Read both off the old block's marking before ordering. An N block would fit mechanically but would widen the machine's parallelism band to 12-37 um - usually unacceptable on a gauge or inspection axis, where a few um of drift shows up directly in the measurement.
Duty lighter and space tighter? AirTAC LRM, ratings unpublished, confirmed on enquiry. Crossed-roller stiffness over a short stroke? LGC. More moment on a long overhang? The long size 25 block at MR 0.58 kN.m versus 0.44. Full checklist: form (carriage only), size by load and moment, flange pattern and length, block count and rail length, accuracy P and the preload-versus-mounting-tolerance trade-off, M6 fitting, pairing code B.
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-P-B-M6 FAQ
Load and lubrication figures stay at the size 25 standard-length values: C 26.9 kN, C0 39.4 kN, MR/MP/My 0.44/0.38/0.38 kN.m, 3.6 cm3 grease fill and 1.1 cm3 top-up at 100 km of travel or 3 to 6 month intervals. The accuracy band tightens from 12-37 um to 3-21 um running parallelism. M6 fixing screws still torque to 1370 N.cm on steel, 921 on cast iron, 686 on aluminium. Block only - no rail, and the rail must be lettered B.
One LSH25 top-flange carriage block, P grade, M6 fitting, pairing code B. That is all - there is no rail, so this code must not be treated as a guide. Find the letter stamped or printed on your existing rail; only a B-lettered LSH25 rail will preserve this block's rated preload and precision. Preload itself is never written into a carriage code - it exists in the block-rail pair once they are mated.
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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-P-B-M6
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