Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X290-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 290mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke290 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- 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 SAIJ125 Adjustable Cylinder SAIJ125X290-50
It features a carbon steel piston rod and PT tapered port threads. By integrating an external stopper at the rear, this model allows you to fine-tune the effective travel down from its 290mm nominal stroke, creating a precise 240-290mm usable window without requiring physical cylinder swaps.
This adjuster functions strictly as a mechanical end-stop for deceleration and positioning, meaning it will not hold a load dynamically without continuous live air pressure. For applications requiring genuine load-holding safety, an external pilot-operated check valve or the related AirTAC SAIL locking cylinder is necessary. The extruded aluminum barrel includes dual sensor grooves for straightforward position feedback.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 290 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×290 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50 Is Used
Product Size Changeovers
Dial in the 240-290mm travel window during format changes on packaging lines, using the rear adjuster to accommodate different carton depths instantly.
Machine Setup Tuning
Fine-tune the exact end-of-stroke position during initial commissioning without machining external stop blocks or altering the ISO 15552 mounting footprint.
Variable End-Stop Forming
Adjust the mechanical stop on the fly for heavy-duty forming or pressing applications that need slight positional variance across different material batches.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50 the Right Cylinder?
If your process demands less force, stepping down to a 100mm bore yields 3927N at 0.5 MPa, whereas moving up to a 160mm bore provides 10053N. The adjustable rear stop is ideal for product-size changeovers, whereas a fixed-stroke SAI cylinder is better suited for dedicated, single-purpose stations.
When ordering a direct ISO 15552 replacement, verify the 125mm bore, 290mm stroke, 50mm adjustment range, PT port threads, and absence of a magnet. Because the 290mm stroke is relatively long, the 32mm rod diameter handles significant side loads, but an external guide rail should still be used to prevent rod binding under heavy off-center loading. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-50 FAQ
The rear adjuster acts as a mechanical stop that trims the effective travel. For this model, you can reduce the 290mm nominal stroke by up to 50mm, providing a usable travel window of 240-290mm. Note that this stop only sets the end position; it does not lock the load without live air pressure.
If you increase the operating pressure to 0.7 MPa, the push force rises to 8590N.
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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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