The AirTAC Airtac LRM Miniature Linear Guides LRM12BK-L-H-E 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-L-H-E is a single long carriage from the LRM miniature linear guide line, sized for the 12 mm stainless-steel LRM rail profile and graded H (high) accuracy. It is a carriage only: the rail is not part of the package and must be bought separately or already be mounted in your machine. The trailing pairing code E is the critical detail - it is the match letter tying this carriage to rails graded E, and it should be read off the part you are replacing before you order.
AirTAC retains the balls inside the carriage so they stay put during handling, yet the manufacturer is clear that sliding the block onto a rail at an angle, or rushing the swap, can still drop balls - a dummy rail is the tidy way to fit a carriage or store one between machines. Inside, the balls are Japanese-made ISO 3290 G10 grade, kept clean by a double-lip seal beneath an outer cover that also hides the mounting screws. Keep ambient temperature at or below 80 C, with transient peaks to 100 C. LRM publishes no load or moment ratings, so we confirm the figures for this exact carriage through the RFQ before your order is placed.
| Model | Airtac LRM Miniature Linear Guides LRM12BK-L-H-E |
|---|---|
| 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 | Long 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. |
| L | Long 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 service technician rebuilding an inspection fixture notes the E code off the old carriage, orders this long H-grade block, and seats it squarely with a dummy rail so no balls drop on site.
Compact vision stages in electronics production use long 12 mm carriages where a steadier bearing span helps a camera hold its line across the full stroke.
Bench laser or sensor heads riding a short 12 mm rail benefit from a long carriage and the H accuracy grade, keeping realignment after a swap to a minimum.
Work through the checklist in order: form (carriage only, rail bought separately), rail width 12 mm, carriage length long, count one, accuracy H, and the pairing code E which must match the rail. Rail length, preload grade and mounting direction all belong to the rail order, not to this carriage. When the duty involves a real load or a cantilever, move up to LSH - its catalogue gives per-carriage dynamic, static and moment ratings you can calculate with, numbers LRM does not publish. If the travel is short and you need crossed-roller rigidity, LGC is the cross-reference. Confirm the load rating with us, then commit.
Quick checklist
One long carriage for a 12 mm wide LRM rail, accuracy grade H, pairing code E. The code carries no rail, no rail length, no preload and no mounting direction - those are chosen with the rail ordered separately. Screws: M3 torque 196 N.cm into steel, 127 N.cm into cast iron, 98 N.cm into aluminium; M2 at 58.8 / 39.2 / 29.4 N.cm. Ambient limit is 80 C with 100 C peaks, and re-greasing is due every 100 km of travel or every 3 to 6 months. Load and moment ratings are not published for LRM; we confirm them per model before you buy.
LRM rails and carriages are matched in pairs and the letter (A to E) records the match. An E carriage belongs on an E-marked rail; mixing letters costs running accuracy. If you are replacing a carriage, read the code off the original part - and note that carriage-only stock is thin, so most pairing letters arrive as 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.