The AirTAC Airtac LRM Miniature Linear Guides LRM12BK-N-H-B is a miniature linear guide on a 12 mm stainless-steel rail with recirculating-ball carriage. It is the small end of the range, for light-duty precision positioning in a tight envelope — compact stages, small pick-and-place heads and inspection fixtures.
LRM12BK-N-H-B is a single standard-length carriage for AirTAC's LRM miniature guide system, made to run on the 12 mm stainless-steel rail profile and graded H (high) accuracy. BK means carriage only - no rail comes with it, so this code exists for replacing or adding a block to a rail you already have. Pairing code B ties it to B-marked rails, and the letter must agree on both parts.
The standard body keeps the carriage footprint short, useful where a machine axis has little room between features or where a long block would foul an adjacent rail. The balls are Japanese ISO 3290 G10 grade held by a ball-retention design, but the maker still warns that an angled insertion or a hasty swap can drop balls, so work squarely and slowly, ideally over a dummy rail. A double-lip seal under the outer cover handles oil scraping and dust exclusion. Keep the ambient temperature at or below 80 C with peaks to 100 C. No load or moment ratings are published for LRM - describe the model and duty on the RFQ and we confirm the figures for you.
| Model | Airtac LRM Miniature Linear Guides LRM12BK-N-H-B |
|---|---|
| Series | LRM Series Miniature Linear Guide |
| Supplied as | Carriage / block only |
| Construction | Recirculating ball, stainless-steel rail, common-rail design |
| Size code | LRM12 |
| Rail width | 12 mm |
| Carriage length | Standard carriage |
| Load & moment ratings | Not published for this series — ask us to confirm for your model |
|---|---|
| Accuracy grade | H — high grade |
| Mounting screws | M2 or M3 rail screws depending on size |
| Lubrication | Pre-filled with Kyodo Yushi PS No. 2; top up through the rear lubrication hole |
| Ambient temperature | Up to 80 °C ambient, 100 °C transient peak |
| Interchangeability | LRM carriages fit LRM rails of the same model, matched by the pairing code |
Specifications follow the official AirTAC LRM catalogue. The catalogue does not publish load or moment ratings, running parallelism, speed limits, or carriage base material for LRM. We will not quote a figure we cannot source — ask us and we will confirm it for your model. This item is a carriage only. Order a complete set if you also need a rail.
| LRM | LRM Series Miniature Linear Guide. |
|---|---|
| 12 | Size code. |
| BK | Carriage / block only — no rail supplied. |
| N | Standard carriage. |
| H | H — high grade. |
| Pairing code | Rails and carriages must share a pairing code. Take it from the original part when replacing. |
| 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.
A benchtop XY positioning stage with tight spacing between axes can take this short standard carriage where a long block would foul the neighbouring rail or frame.
Automated optical inspection machines move small camera heads over boards; a standard 12 mm carriage on an H-grade rail keeps the head tracking true along the board length.
Small reagent dispensing axes in life-science instruments use standard 12 mm carriages where stroke is short and space scarce; a replacement block revives a worn axis without a new rail.
Confirm the basics first: form is carriage only, rail width is 12 mm, the carriage is standard length, count is one, accuracy is H, and pairing code B must match your rail. Rail length, preload and mounting direction are decided with the rail, which you order separately or already own. If the duty is a substantial or cantilevered load, LSH is the step up - it publishes dynamic, static and moment ratings per carriage that you can size against, unlike LRM. Short travel with a rigidity demand points across to LGC's crossed rollers. Either way, confirm the load rating with us before ordering.
Quick checklist
Rail width 12 mm; carriage length standard; one carriage per code; accuracy H; pairing B. No rail, rail length, preload or mounting direction comes with a carriage code. Torque the mounting screws to 196 N.cm into steel, 127 N.cm into cast iron or 98 N.cm into aluminium with M3 screws (M2: 58.8 / 39.2 / 29.4 N.cm). The ambient temperature limit is 80 C with 100 C peaks, and re-greasing falls due every 100 km of travel or every 3 to 6 months. Load and moment ratings are not published for LRM - we confirm per model through the RFQ.
The box holds one carriage and nothing else - the rail is separate, and its pairing letter must read B to match. The ball-retention design keeps the balls in during normal handling, but the manufacturer cautions that presenting the carriage at an angle, or fitting and removing it quickly, can still drop balls; square it to the rail and slide it on steadily, using a dummy rail if the block must wait between machines. Carriage-only stock is thin, so pairing-B blocks are normally special orders.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models are processed and dispatched in 3-5 business days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours. We can also confirm the load and moment rating for this model.