Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-100 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 SAIJ125AX280-100
The AirTAC SAIJ125X280-100 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 180 to 280 mm, allowing you to dial back the nominal 280 mm stroke by up to 100 mm during commissioning. This bore size delivers 6136 N of pull force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This SKU uses a SUS420J2 stainless steel rod for enhanced corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides. Note that the rear adjuster acts only as a travel stop to fine-tune deceleration and end positions; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-100 |
|---|---|
| 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 SAIJ125AX280-100
| 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 SAIJ125AX280-100 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 180 and 280 mm for heavy jigs that require precise end-positioning without swapping out the entire actuator.
Product Size Changeover
Quickly adapt a production line to different product lengths by turning the rear adjuster screw, saving downtime on tooling modifications.
Heavy-Duty Forming Setup
Leverage the 6136 N pull force at 0.5 MPa to form or press components, using the 100 mm adjustment range to fine-tune the working depth at commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-100 the Right Cylinder?
Choose this 125 mm bore cylinder when an application requires substantial force—such as 6136 N pull at 0.5 MPa—and exact end-position tuning without adding external stops. If your process requires less force, stepping down to an 80 mm bore yields 2268 N of pull force at 0.5 MPa. The 100 mm adjustment window is ideal for product changeovers on a line where the end-stop distance frequently varies.
When matching this for an ISO 15552 replacement, verify the 280 mm stroke, 100 mm adjustment range, PT port threads, and the specific mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the stroke is 280 mm, ensure adequate support to prevent rod side-load, using an external guide if necessary. For load-holding without live pressure, consider an AirTAC SAIL or BSAI cylinder instead.
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 SAIJ125AX280-100 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 6136 N of push force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a mechanical stop that lets you trim the effective travel from the nominal 280 mm down to 180 mm. It is a travel stop for fine-tuning end positions, not a lock, and it cannot hold a load without continuous air pressure.
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