The AirTAC Airtac LRM Miniature Linear Guides LRM7BK-L-H-A is a miniature linear guide on a 7K 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.
LRM7BK-L-H-A is a replacement carriage only, for the AirTAC LRM7 7 mm miniature rail family. There is NO RAIL in this box - order this part only if you already have a running LRM7 rail or are buying rails and carriages as separate lines. The body is the long version, which extends the ball spread and the bearing span relative to the standard carriage of the same series.
The trailing -A is the pairing code: AirTAC matches carriages to rails by letter from A to E, and a replacement must carry the same letter as the rail it will run on, so read the code off the original part before ordering. Accuracy is grade H. Inside, the balls are Japanese ISO 3290 G10 grade (a ball-grade statement, not a standard for the guide), running behind a double-lip seal under an outer cover. Ambient temperature limit: 80 C, with peaks to 100 C. Load ratings are not published for LRM; ask us and we confirm them for this specific part. Note that only a handful of carriage-only parts are regular lines in the range, so this pairing is typically placed as a special order.
| Model | Airtac LRM Miniature Linear Guides LRM7BK-L-H-A |
|---|---|
| Series | LRM Series Miniature Linear Guide |
| Supplied as | Carriage / block only |
| Construction | Recirculating ball, stainless-steel rail, common-rail design |
| Size code | LRM7K |
| Rail width | 7K 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. |
|---|---|
| 7K | 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.
Renewing a worn long carriage on an existing LRM7 rail in a small dispensing or handling module, using the pairing letter to guarantee a matched fit.
Refurbishing the slide of a compact laboratory instrument, swapping in a fresh grade H carriage while keeping the original 7 mm rail in service.
Holding a matched spare long carriage for a miniaturised electronics test handler, so a damaged block can be replaced without redesigning the axis.
Replacing a carriage is a matching exercise, not a sizing one: confirm the series size (7 mm rail width here), the carriage length (L), the accuracy grade (H) and above all the pairing letter on your rail - this part carries A. If your rail is damaged or missing, buy a complete set instead, because a fresh rail will not necessarily pair with an old carriage code. For a heavier or cantilevered duty, the larger LSH series publishes the dynamic, static and moment ratings that LRM does not; for short, stiff travel, LGC with crossed rollers is the alternative. Confirm the load rating with us for the specific part before ordering.
Quick checklist
One long carriage block for a 7 mm wide LRM rail, accuracy grade H, pairing code A - and no rail, no preload grade and no rail length are part of this code. The carriage ships pre-filled with Kyodo Yushi PS No. 2; top up through the rear lubrication hole, re-greasing every 100 km of travel or every 3 to 6 months, and keep the ambient at or below 80 C. Load and moment ratings are not published for LRM - we confirm them per part when you enquire.
AirTAC pairs carriages and rails with a letter from A to E, marked on the parts. Read the letter off your existing rail or carriage; if it reads A, this block is the match. Never mix codes - a mismatched pairing compromises running accuracy. Handle the swap slowly too: ball retention helps, but fitting a carriage at an angle or too quickly can still drop balls, and a dummy rail is the safe way to refit a carriage.
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.