Airtac LSH Linear Guide Block LSH25BK-HN-P-B-M6
The AirTAC LSH Linear Guide Block LSH25BK-HN-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 Block LSH25BK-HN-P-B-M6
Here you get one AirTAC LSH25 square carriage, standard length, in the precision P accuracy grade, with an M6 grease fitting and pairing code B - the rail is not included. Four rows of balls circulate through X-set 45 degree arc raceways, so the block pushes, lifts and side-loads with equal capacity and self-aligns over slight mounting error instead of jamming. It runs on a 23 mm wide LSH25 rail; the 25 in the part number is the size code, not the width.
Capacity is the same as the normal-grade block - 26.9 kN dynamic, 39.4 kN static, 0.44 / 0.38 / 0.38 kN.m of moment - but P grade tightens the running parallelism band to 3-21 um, against 12-37 um for normal grade. For a measurement axis or a machine that must land in the same place every cycle, that geometric improvement, not extra strength, is what you are paying for.
Airtac LSH Linear Guide Block LSH25BK-HN-P-B-M6 Technical Specifications
| Model | Airtac LSH Linear Guide Block LSH25BK-HN-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 | Square (compact) |
| 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 listed 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 Block LSH25BK-HN-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 Block LSH25BK-HN-P-B-M6 Is Used
Metrology stage upgrade
A coordinate measuring fixture rebuilt with precision-grade carriages on its LSH25 axes holds its probe position to a few um over the stroke - exactly the upgrade path when a normal-grade stage drifts.
Panel saw guide service
The fence carriage on a panel saw must track dead straight along its rail; a precision-grade replacement block with pairing code B removes the wander that shows as out-of-square cuts.
High-cycle press slide
A small assembly press cycling several times a minute needs its slide to return to the same position every stroke; a P-grade LSH25 carriage on the matched rail keeps the ram repeatable under side load.
Is the Airtac LSH Linear Guide Block LSH25BK-HN-P-B-M6 the Right Guide?
Precision grade is worth choosing when straightness of travel matters more than brute capacity: this block's grade band is 3-21 um of running parallelism against 12-37 um for normal grade, a real gain at size 25. The ratings are unchanged - 26.9 kN dynamic, 39.4 kN static, 0.44 / 0.38 / 0.38 kN.m of moment - so do not expect P to add capacity; it buys geometric accuracy. Size down to AirTAC LRM for light, compact duties (we confirm its unpublished ratings), up to a long LSH25 carriage or LSH30 when the moment arm governs, and across to LGC for short travels that want crossed-roller stiffness.
Pre-order checklist: form - carriage only, no rail supplied; size judged on load and moment together; square body, standard length; number of blocks and rail length; accuracy grade P and the preload grade, remembering a tighter preload shrinks the mounting error the guide will tolerate; M6 grease fitting; and the pairing code B, which your rail must share.
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 Block LSH25BK-HN-P-B-M6 FAQ
Loadings per block: dynamic C 26.9 kN, static C0 39.4 kN, allowable static moments 0.44 kN.m (MR), 0.38 kN.m (MP) and 0.38 kN.m (My). The P accuracy grade runs at 3-21 um of running parallelism over the rail length bands, tighter than the 12-37 um of normal grade. Rail fixing is M6 screws at 1370 / 921 / 686 N.cm for steel / cast iron / aluminium, and the grease routine is 3.6 cm3 first charge, 1.1 cm3 top-up, every 100 km or every 3 to 6 months.
The box holds one square carriage, standard length, precision accuracy, M6 fitting - and nothing else; there is no rail. The pairing code on this block is B, and it must match the code on the rail it runs on. Because an LSH carriage fitted to a same-model LSH rail keeps its smoothness, preload and accuracy, a B-coded replacement behaves exactly like the original as long as the rail itself is unworn.
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 Block LSH25BK-HN-P-B-M6
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.