Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 280mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-50
The AirTAC SAIJ125X280-50 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa, utilizing a 32mm carbon steel rod and M27x2 rod threading. By integrating a 50mm adjustment mechanism, this unit allows you to dial back the 280mm nominal stroke to any effective travel length between 230mm and 280mm. This fine-tuning capability is ideal for dialing in exact end positions during machine commissioning without adding external stops.
This pneumatic actuator features a PT tapered port thread (G1/2) and operates at speeds between 30-500mm/s. The extruded aluminum barrel includes sensor grooves on both sides for straightforward switch mounting. It uses a reduced mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options. The rear adjuster acts purely as a travel stop to set the retraction end, meaning it will not hold a load safely without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 280 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 | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×280 | 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 SAIJ125X280-50 Is Used
Variable End-Stop Positioning
Ideal for heavy-duty press operations where the bottoming position must be dialed in precisely within a 230-280mm window to accommodate material thickness variations.
Machine Setup Changeover
Allows production lines to switch between different product sizes quickly by adjusting the rear stopper up to 50mm, avoiding the need to physically swap out the entire cylinder.
Long-Stroke Assembly Press
Provides the robust 6136N force needed for driving large components, while the adjustable end-position ensures parts are seated perfectly without bottoming out harshly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-50 the Right Cylinder?
Selecting this 125mm bore actuator makes sense when your application requires heavy thrust, such as 8590N at 0.7 MPa, alongside variable end-stop positioning. If your setup needs less force, stepping down to a 100mm bore provides 3927N at 0.5 MPa. Conversely, moving up to a 160mm bore yields 10053N at 0.5 MPa. You would choose this adjustable SAIJ variant over a fixed-stroke SAI when a product line requires frequent changeovers, letting you alter the usable travel window by up to 50mm on the fly.
Because the nominal stroke is 280mm, the 32mm rod and M27x2 thread provide substantial support, but you should still use an external guide to prevent excessive side-loading on long travels. For load-holding without live pressure, this cylinder is insufficient since the adjuster is not a lock; you would need to specify a SAIL or BSAI variant, or utilize an external pilot-operated check valve. To match this ISO 15552 footprint exactly, confirm the 125mm bore, 280mm stroke, 50mm adjustment, PT port, and mounting style.
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 SAIJ125X280-50 FAQ
The rear adjuster acts as a mechanical stop that lets you trim the effective travel back by up to 50mm from the 280mm nominal stroke. This creates a usable travel window of 230-280mm, allowing you to fine-tune the retraction end position during commissioning without swapping cylinders.
At a 0.5 MPa operating pressure, this double-acting cylinder provides 6136N of push force and 5734N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 8590N.
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