Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-75S 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 SAIJ125X280-75S
The AirTAC SAIJ125X280-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering robust thrust for heavy machinery. With a 125mm bore, it generates 6136N of pull force at 0.5 MPa and 8590N at 0.7 MPa. The integrated -S magnet enables precise position detection using CMSE reed or DMSE solid-state switches housed in the dual-side sensor grooves. This specific SKU features a 75mm adjustment range, creating a usable travel window between 205mm and 280mm to fine-tune end positions without adding external stops.
Unlike fixed-stroke alternatives, this adjustable model allows you to dial in the exact retract distance during commissioning or product changeovers. The extruded aluminum barrel design supports a speed range of 30-500 mm/s, while the PT tapered port threads ensure a tight, leak-free pneumatic connection. The rear adjuster functions strictly as a mechanical stop to set the travel end, not as a locking device, meaning live air pressure is required to hold the load in place.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-75S |
|---|---|
| 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 SAIJ125X280-75S
| 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 SAIJ125X280-75S Is Used
Variable End-Stop Positioning
Dial in retract distances from 205mm to 280mm during machine setup to accommodate varying material thicknesses without changing hardware.
Automated Heavy Clamping
Leverages the 8590N push force at 0.7 MPa to secure heavy workpieces, using the rear stopper to prevent over-travel during the clamping cycle.
Product Changeover Diverter
Quickly adjusts the stroke window on a packaging conveyor to handle different package lengths, reducing downtime between production runs.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-75S the Right Cylinder?
Select this 125mm bore cylinder when your application demands high force (up to 6136N pull at 0.5 MPa) alongside variable end-position tuning. If your setup requires less force, stepping down to a 100mm bore provides 3681N pull force; if you need more power, a 160mm bore yields 9425N. The 75mm adjustment window is particularly valuable for packaging lines or equipment that frequently processes different product sizes, as it eliminates the need to physically swap cylinders for shorter strokes.
For a drop-in ISO 15552 replacement, match the 125mm bore, 280mm stroke, 75mm adjustment, PT port thread, and -S magnet options. The mounting footprint supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 accessories. Because this unit features a 280mm stroke, it is critical to use an external guide for heavy loads to prevent excessive side-loading on the 32mm carbon steel rod. If your application requires true load-holding without continuous air pressure, consider the SAIL or BSAI series 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 SAIJ125X280-75S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of pull force and 6136N of push force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective stroke from 280mm down to 205mm. It sets the travel end but does not lock the load without live air pressure.
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