Airtac LSH Linear Guide Block LSH25BK-HL-P-B-M6
The AirTAC Airtac LSH Linear Guide Block LSH25BK-HL-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 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-B-M6
Accuracy grade P is the reason this carriage exists as its own line item: on the running parallelism scale it is graded to 3-21 um across rail lengths, against 12-37 um for the common N grade - roughly half to a third the error band, which shows up directly as straighter travel on a measuring machine. The part itself is one AirTAC LSH25 long square block, precision grade, M6 nipple, carriage only, with no rail in the sale (the BK marker). Four ball circuits cross at 45 degree X-angled arc raceways, two contact points per ball, equal capacity in all four directions and enough self-alignment to forgive slight mounting-surface error.
Keep the numbers matched to the grade: dynamic C 32.9 kN and static C0 53.0 kN are unchanged by the P marking, and the long body still holds MR at 0.58 kN.m. The precision benefit only lands if the rail is also P grade, so this block should pair with a P-graded LSH25 rail of the same model, sharing pairing code B. A P carriage run on an N rail will perform to the rail's grade, not the carriage's.
Airtac LSH Linear Guide Block LSH25BK-HL-P-B-M6 Technical Specifications
| Model | Airtac LSH Linear Guide Block LSH25BK-HL-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 | 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-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. |
| 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-B-M6 Is Used
CMM retrofit staging slide
Bringing coordinate-measuring capability to a production floor often means retrofitting a staging slide. A P-grade block on a P rail keeps the 3-21 um travel band that inspection work demands.
Laser alignment bench
Aligning laser optics along a 1 m bench needs the beam path to stay true as the carrier moves. The P grade limits running parallelism enough for alignment work at these loads.
High-speed die-cut feed table
A die-cutting press feed table cycles hard and fast; the long block's raised moment rating keeps the tooling plate flat under acceleration while the P grade holds cut registration.
Is the Airtac LSH Linear Guide Block LSH25BK-HL-P-B-M6 the Right Guide?
Precision work changes the checklist order: grade first, then load. Confirm your machine actually needs the 3-21 um band - if the N grade's 12-37 um would pass, the N carriage is the better value. Then check moment (0.58 kN.m MR on this long body, 32 percent more than the standard length) and static margin (C0 53.0 kN, about 1.6 times C). Downsize to LRM when the load is light and space is scarce, noting its ratings are unpublished and we confirm them per order; move to LGC for short-travel jobs where crossed-roller stiffness beats a long recirculating run.
Ordering checklist: carriage only, no rail included; size 25; square long block; P accuracy; M6 fitting; and pairing code B matching the B letter on your P-grade rail.
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-B-M6 FAQ
Dynamic rating C 32.9 kN; static C0 53.0 kN; allowable moments MR 0.58, MP 0.57, My 0.57 kN.m per carriage. Running parallelism for grade P: 3-21 um, varying with rail length. Rail mounting hardware: M6 screws at 1370 N.cm (steel), 921 N.cm (cast iron), 686 N.cm (aluminium), with the mounting-shoulder corner radius kept at 1 mm or less. Grease: Mobilux EP2, 4.5 cm3 first charge, 1.4 cm3 top-up, refreshed every 100 km of travel or every 3-6 months, whichever comes first.
One precision-grade long square carriage, nothing else - no rail, no mounting screws, no bolt caps. The pairing letter B ties this block to a rail that carries the same letter, the two having been matched at the factory to preserve the intended fit and grade. Read the letter from the rail end face or its label before ordering. P-grade carriages belong with P-grade rails of the same LSH model; mixing grades gives you the lower of the two. Base materials, weight and dimensional drawings are not stated in the AirTAC catalogue for this family - confirm any of these from the datasheet via RFQ.
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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-B-M6
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