Airtac LSH Linear Guide Rail LSH20BK-F1L-N-B-M6
The AirTAC Airtac LSH Linear Guide Rail LSH20BK-F1L-N-B-M6 is a standard-type profile linear guide on a 20 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
- SizeLSH20
- Rail width20 mm
- Carriage lengthLong 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 LSH20BK-F1L-N-B-M6
This is a carriage-only listing: one standard-accuracy LSH20 long top-flange block from AirTAC, drilled for an M6 grease fitting, with no rail in the box. Pairing code B on this block must match pairing code B on your LSH20 rail - read it off the old block or the rail end before ordering. The carriage rides on four ball rows seated in 45 degree X-pattern arc grooves, two contact points each, so downthrust, lift-off and side loads all land on the same rating, and small machining errors in the base surface are taken up inside the block rather than jamming it. The rail under a size 20 LSH guide is 20 mm wide.
Load numbers for the long LSH20 block: 22.2 kN dynamic, 37.6 kN static, moments MR 0.35 / MP 0.34 / My 0.34 kN.m. Worth knowing before you over-buy: stepping up to a standard-length LSH25 set only lifts MR from 0.27 to 0.44 kN.m. If your problem is tipping rather than straight load, this long body or a second block on the same rail often solves it for less money and less redesign.
Airtac LSH Linear Guide Rail LSH20BK-F1L-N-B-M6 Technical Specifications
| Model | Airtac LSH Linear Guide Rail LSH20BK-F1L-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 | LSH20 |
| Rail width | 20 mm |
| Carriage style | Flange, top mounting |
| Carriage length | Long carriage |
| Basic dynamic load rating C | 22.2 kN per carriage |
|---|---|
| Basic static load rating C0 | 37.6 kN per carriage |
| Allowable static moment | MR 0.35 / MP 0.34 / My 0.34 kN·m |
| Accuracy grade | N — normal grade |
| Mounting screws | M5 — 882 N·cm into steel, 588 cast iron, 441 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 LSH20BK-F1L-N-B-M6
| LSH | LSH Series Linear Guide. |
|---|---|
| 20 | Size code. |
| 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. |
| 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 LSH20BK-F1L-N-B-M6 Is Used
Packaging line pusher replacement
A carton pusher on a conveyor diverter cycles a short stroke all shift - at a 300 mm stroke and one cycle per second, 100 km of travel piles up in about two weeks, so the block wears out before the season ends. Swap this B-coded F1 block and leave the rail alone.
Core-XY 3D printer gantry refresh
Rebuilding a Core-XY printer's X or Y gantry? A single long F1 block per rail stiffens the toolplate against tipping at the ends of travel, and standard accuracy is plenty at typical layer resolutions.
E-commerce sorter slide renewal
Sorter divert-arm slides eat blocks in dusty aisles. Fitting this long carriage to the existing rail restores 22.2 kN of dynamic capacity per block without pulling the whole conveyor section out of the sort loop.
Is the Airtac LSH Linear Guide Rail LSH20BK-F1L-N-B-M6 the Right Guide?
Check the downgrade first: small envelopes with light loads may run happily on AirTAC LRM, whose ratings we verify by enquiry since they are not catalogued. If your load tips rather than pushes, remember the long body already buys about 30 percent more MR than the standard LSH20 block, and one full size up to LSH25 N adds roughly 63 percent more again. For short strokes needing crossed-roller rigidity, compare LGC before settling on a recirculating guide. Order checklist: form (no rail included), size 20 judged against both C and MR, F1 flange bolted from above, long carriage, accuracy N, M6 nipple, and pairing code B matched between this block and your rail. If you later buy the complete set version, tighter preload will tighten the allowable mounting error too.
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 LSH20BK-F1L-N-B-M6 FAQ
Per carriage: dynamic C 22.2 kN, static C0 37.6 kN, moments MR 0.35 kN.m, MP 0.34 kN.m, My 0.34 kN.m. Normal accuracy grade runs at 12-37 um parallelism depending on rail length. Under the block, the rail clamps with M5 screws at 882 N.cm (steel), 588 N.cm (cast iron) or 441 N.cm (aluminium). Lubrication: Mobilux EP2 or equivalent, 2.7 cm3 first fill and 0.9 cm3 top-ups per long block, refreshed every 100 km of travel or every 3 to 6 months.
No - it buys one carriage only: a size 20 F1 long top-flange block, normal accuracy, M6 fitting. The rail is a separate SKU, and preload is a property of the matched pair rather than of this code. The B is the pairing code; AirTAC LSH blocks and rails are interchangeable within the same model and letter, so a B block runs on a B rail at its rated smoothness. Read the letter off your old block, order to match, and keep the rail if its raceways are sound - the block swap is the cheap fix.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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