Airtac LGC Series Cross Roller Guide Rail LGC4R40
The AirTAC Airtac LGC Series Cross Roller Guide Rail LGC4R40 is a crossed roller guide using Ø4.0 mm precision rollers. Rollers are held in a cage in alternating orientation between hardened V-raceways, giving line contact instead of point contact — much higher rigidity and accuracy than a ball guide of similar size. It does NOT recirculate, so travel is set by rail length and the cage travels about half the stroke.
- SeriesLGC
- Supplied asRoller cage assembly (spare part)
- SizeLGC4
- Roller diameterØ4.0 mm
- Rollers in cage40
- 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 LGC Series Cross Roller Guide Rail LGC4R40
A 40-roller cage is among the larger stocked counts for AirTAC size 4 guides, and LGC4R40 is exactly that: the spare roller cage subassembly with 40 hardened 4.0 mm rollers, sold without any rail and without any slide. It is not a rail and not a complete guide - those are ordered as full LGC codes ending in R40. The crossed, alternating roller orientation gives line contact against the raceways, which is why a crossed roller guide is so much stiffer than a ball guide of similar size.
Per roller, size 4 is rated 1230 N dynamic and 1170 N static, in newtons; the guide's overall capacity grows with the 40 rollers the cage carries, though no per-guide total is published. The static rating being slightly below the dynamic one is normal for this series and surprises buyers coming from ball guides. Because the cage walks roughly half the stroke along the rail, a longer rail gives the cage more room to drift - another reason a stocked spare and a recovery routine of several full strokes to re-centre it are worth having.
Airtac LGC Series Cross Roller Guide Rail LGC4R40 Technical Specifications
| Model | Airtac LGC Series Cross Roller Guide Rail LGC4R40 |
|---|---|
| Series | LGC Series Crossed Roller Guide |
| Supplied as | Roller cage assembly (spare part) |
| Construction | Crossed precision rollers in a cage, NON-recirculating, line contact |
| Size code | LGC4 |
| Roller diameter | Ø4.0 mm |
| Rollers per cage | 40 |
| Rail material | Stainless steel |
| Travel | Limited by rail length — the cage travels about half the stroke |
| Basic dynamic load rating C | 1230 N per roller |
|---|---|
| Basic static load rating C0 | 1170 N per roller |
| Mounting screws | Per catalogue tightening-torque table |
| Lubrication | Per catalogue; adjust clearance and preload before use |
| Interchangeability | LGC carriages fit LGC rails of the same model, matched by the pairing code |
Specifications follow the official AirTAC LGC catalogue. Load ratings are stated PER ROLLER, not per guide — total capacity depends on how many rollers the cage carries, which is why the roller count is part of the order code. Maximum stroke and tightening torques are given in the catalogue tables; ask us for the figure for your size. This item is a roller cage only — neither a rail nor a complete guide.
Model Code: Airtac LGC Series Cross Roller Guide Rail LGC4R40
| LGC | LGC Series Crossed Roller Guide. |
|---|---|
| 4 | Size code — sets the roller diameter (Ø4.0 mm). |
| R40 | Cage carrying 40 rollers. |
| -H / -P | Accuracy grade: H high, P precision. |
What Is In The Box
| This order | Roller cage assembly (spare part) |
|---|---|
| Rail | No — not supplied with this item |
| Rollers and cage | Yes, 40 rollers |
This is the cage-and-rollers subassembly sold as a spare. It is NOT a rail and NOT a complete guide. 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 LGC Series Cross Roller Guide Rail LGC4R40 Is Used
Lens barrel assembly fixture
A press-fit lens assembly station using a size 4 crossed roller slide for controlled, rigid short travel can be kept running from stores when its 40-roller cage is replaced with this spare, instead of waiting on a new guide.
Metrology stage recalibration
During annual recalibration of a precision measuring stage, a technician who finds cage wear can fit this LGC4R40, centre it by stroking, and verify alignment with a dial indicator before the stage goes back into service.
High-speed die sorter slide
High acceleration on a short-stroke sorting slide is a classic cause of cage drift; if repeated full strokes no longer re-centre the cage, swapping in this 40-roller spare - with rollers rated 1230 N per roller - restores smooth travel.
Is the Airtac LGC Series Cross Roller Guide Rail LGC4R40 the Right Guide?
This is a repair spare, so buy it against an existing guide: the complete guide's code must read size 4 and end in R40 for this cage to match, and rails from different sets must never be mixed when servicing. Row arrangement, rail length and accuracy grade are not part of a cage code - they are specified only on a full guide order, where stocked complete guides are grade H and grade P is to order, and rail lengths run 20-600 mm, chosen from the maximum-stroke table with the working stroke set shorter than the maximum. Installation and adjustment happen on the machine: the cage is inserted through the end of the guide, centred by stroking, and the assembly is brought to accuracy with a dial indicator, with clearance set by adjusting screws, pressure plate or taper block as the rigidity requirement dictates. Choosing between families: LSH for long travel or a sealed recirculating carriage, LRM for light-duty compact slides, and LGC - as here - for short-travel, high-rigidity precision axes.
Quick checklist
- ✓ Complete set, carriage only, or rail only?
- ✓ Worst-case moment, not just straight load
- ✓ Travel length and mounting space
- ✓ Stroke shorter than the rail allows for cage travel
- ✓ Clearance method: screws, plate or taper block
- ✓ 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 Centre the roller cage on the rail during assembly.
- check Adjust with a dial indicator over the full stroke.
- check Never mix rails from different sets — accuracy is matched per set.
- check Installation by qualified personnel per AirTAC docs.
Airtac LGC Series Cross Roller Guide Rail LGC4R40 FAQ
It is a size 4 roller cage with 40 rollers of 4.0 mm diameter. AirTAC's catalogue rates size 4 rollers at 1230 N dynamic and 1170 N static per roller (newtons, per roller); the complete guide's capacity scales with the roller count and the fitted adjustment, not with a published per-guide total. A cage code specifies no rail length, no row arrangement (that is A three-row or B four-row on the guide) and no accuracy grade.
Check the ordering code on the guide you are repairing: it ends in R plus the roller count, so only a guide ending in R40 takes this cage. Counts must not be mixed between sets because accuracy is controlled as a matched set. If the fault is cage drift rather than damage, try recovery first - run the slide through several full strokes to bring the cage back near centre, and on vertical axes leave stroke margin since gravity makes drift accumulate in one direction.
Authorized Export Seller
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 LGC Series Cross Roller Guide Rail LGC4R40
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