Airtac LSH Linear Guide Block LSH25BK-HL-P-C-M6
The AirTAC Airtac LSH Linear Guide Block LSH25BK-HL-P-C-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
- 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-HL-P-C-M6
This listing is the carriage only. LSH25BK-HL-P-C-M6 is an AirTAC LSH25 long square carriage, precision accuracy grade, pairing code C, with an M6 grease nipple. No rail is supplied and no rail length is implied - buy the matching C-coded rail separately or confirm the letter on your existing rail. The block rides on four rows of recirculating balls seated in X-shaped 45 degree raceways, so it carries load up, down and sideways at equal rating and absorbs slight mounting-surface error internally instead of binding. The LSH25 rail it mates with is 23 mm wide, not 25.
The long body is the point: per carriage it rates 32.9 kN dynamic, 53.0 kN static and 0.58 kN.m MR moment, against 26.9 kN and 0.44 kN.m for the standard LSH25 block. That is about 22 percent more load capacity but 32 percent more roll moment - so where a cantilevered or overhung part tips the carriage, the long body usually fixes it before a bigger size is needed. Note too that 53.0 kN static sits around 1.6 times the dynamic rating; travel life is sized on C, not on the bigger C0.
Airtac LSH Linear Guide Block LSH25BK-HL-P-C-M6 Technical Specifications
| Model | Airtac LSH Linear Guide Block LSH25BK-HL-P-C-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 | 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 | 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 Block LSH25BK-HL-P-C-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. |
| 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-HL-P-C-M6 Is Used
CNC router Z-axis rebuild
A spindle head hanging off the side of a router gantry sees roll moment every time the tool bites. This long LSH25 block lifts MR to 0.58 kN.m over the standard body, holding the head square without moving to a bigger rail.
Overhung tooling arm on an assembly slide
Where an overhung arm loads one end of a slide, moment decides the size, not the weight. At 0.58 kN.m MR this carriage carries the overhang that would tip a standard LSH25 block rated at 0.44 kN.m.
Retrofit of a granite inspection bench
Upgrading an older bench slide to precision grade: this P-rated block, matched to its C-coded rail, keeps measured travel inside the 3 to 21 um precision band across the rail length.
Is the Airtac LSH Linear Guide Block LSH25BK-HL-P-C-M6 the Right Guide?
Price this against the alternatives in both directions. Down: AirTAC LRM suits lighter duties in a tighter envelope, but its load ratings are not published, so we confirm them with the maker before you commit. Across: LGC crossed rollers win when travel is short and rigidity per millimetre matters more than long recirculating run. Up: LSH30 if the moment here still falls short. Your checklist for this item: form is carriage only; size chosen on load and moment together - 32.9 kN and 0.58 kN.m MR; body is long square, grade P accuracy; one block, order a second if the load tips along the travel; accuracy and preload are finally fixed on the complete set, where a tighter preload buys rigidity but narrows the allowed mounting error; M6 fitting family covers sizes 20 to 35; rail must be marked with pairing code C.
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-HL-P-C-M6 FAQ
Per carriage: dynamic C 32.9 kN, static C0 53.0 kN, allowable moments MR 0.58, MP 0.57 and My 0.57 kN.m. Precision grade running parallelism falls in a 3 to 21 um band depending on rail length. Rail screws are M6, torqued to 1370 N.cm in steel, 921 in cast iron and 686 in aluminium. Grease: 4.5 cm3 first charge, 1.4 cm3 top-up, renewed every 100 km of travel or every 3 to 6 months.
No rail is included - this listing is the long square carriage by itself. The C is its pairing code and the rail it runs on must carry the same letter, marked on the rail end and shown on the original order. Once the letters match, a same-model LSH carriage holds its smoothness, preload class and accuracy on that rail.
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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 Block LSH25BK-HL-P-C-M6
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.