Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-75 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 SAIJ125X280-75
The AirTAC SAIJ125X280-75 is a double-acting, single-rod ISO 15552 profile cylinder engineered for high-force applications requiring precise end-position tuning. A built-in rear adjusting screw allows you to shorten the effective travel, providing a usable stroke window of 205 to 280 mm without changing the cylinder or adding external stops. Operating at 0.5 MPa, it generates 6136 N of pull force and 8590 N of push force at 0.7 MPa, making it ideal for heavy-duty positioning tasks.
This model features a 32 mm carbon steel rod with an M27x2 thread, designed to handle substantial side loads, though any stroke exceeding 300 mm still necessitates an external guide. The extruded aluminum barrel includes sensor grooves on both sides, and while no magnet is specified here, adding a -S option enables compatibility with AirTAC CMSE reed and DMSE electronic solid-state switches. The rear adjuster acts strictly as a travel stop for deceleration and positioning, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-75 |
|---|---|
| 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 SAIJ125X280-75
| 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 SAIJ125X280-75 Is Used
Variable End-Stop Positioning
Dial in the exact clamping depth between 205 and 280 mm during machine setup, allowing rapid adaptation to different workpiece heights without replacing the cylinder.
Heavy-Duty Press Fitment
Leverage up to 8590 N of push force at 0.7 MPa to seat heavy components, using the rear stopper to fine-tune the final press depth and prevent over-travel.
Product-Size Changeover Lines
Adjust the effective travel window on automated conveyors when switching product sizes, utilizing the 30-500 mm/s speed range to maintain consistent cycle times.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-75 the Right Cylinder?
Choose this 125 mm bore when 80 mm bore cylinders (providing 2513 N push at 0.5 MPa) lack the necessary force, or step down from a 160 mm bore if 10053 N is excessive for your fixture. The 75 mm adjustment range is selected over a fixed-stroke SAI cylinder when a machine handles frequent product-size changeovers, allowing operators to dial in the exact end-stop during commissioning rather than swapping out physical hardware. For load-holding requirements without continuous air pressure, this standard SAIJ adjuster will not function as a lock; consider the SAIL air-released lock or BSAI clamp-lock series instead. To match this ISO 15552 interchangeable replacement, specify a 125 mm bore, 280 mm stroke, 75 mm adjustment, PT tapered port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, 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 SAIJ125X280-75 FAQ
At an operating pressure of 0.5 MPa, the SAIJ125X280-75 generates 6136 N of pull force and 6136 N of push force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw acts as a mechanical stop that allows you to trim the nominal 280 mm stroke back by up to 75 mm, creating a usable travel window of 205 to 280 mm. It functions only as a travel stop and does not lock the load without live air pressure.
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