Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-50S 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 SAIJ125X280-50S
The AirTAC SAIJ125X280-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 230 to 280 mm, enabling precise end-position tuning without external stops. Operating at 0.7 MPa, it delivers 8590 N of push force and 5734 N of pull force, making it suitable for heavy-duty positioning.
This unit includes a magnet for CMSE reed and DMSE electronic sensors, which mount directly into the dual-side sensor grooves on the extruded aluminum barrel. The PT tapered port thread and carbon steel rod are standard, while the rear adjuster acts strictly as a travel stop for deceleration, not a lock for holding loads without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-50S |
|---|---|
| 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 SAIJ125X280-50S
| 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 SAIJ125X280-50S Is Used
Variable End-Stop Tuning
Dial in the exact retract distance within the 230-280 mm window during commissioning to accommodate different material thicknesses without adding external mechanical stops.
Product Changeover
Rapidly adjust the stroke up to 50 mm when switching the production line to a new product size, minimizing downtime and avoiding cylinder replacement.
Heavy Fixture Positioning
Leverage the 8590 N push force at 0.7 MPa to shift heavy jigs into place, using the rear screw to set the precise deceleration point for the end of travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-50S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (3518 N push at 0.7 MPa) lacks the thrust for moving heavy fixtures, but a 160 mm bore (14074 N) would be excessive. The 50 mm adjustment range is ideal for machine setup and product changeover, allowing you to fine-tune the retract end position on the fly rather than swapping a fixed-stroke SAI cylinder.
For an ISO 15552 replacement match, specify the 125 mm bore, 280 mm stroke, 50 mm adjustment, PT G1/2 port, and the -S magnet. Because the stroke is 280 mm, ensure external guides are used to prevent excessive side loading on the 32 mm carbon steel rod. If you need true load-holding without continuous air pressure, select the SAIL or BSAI series instead of relying on this adjuster.
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 SAIJ125X280-50S FAQ
At 0.7 MPa, this 125 mm bore cylinder provides 8590 N of push force and 5734 N of pull force. It can deliver up to 11045 N push at 0.9 MPa.
The rear adjuster acts as an external stopper that lets you shorten the effective stroke by up to 50 mm, providing a usable travel window of 230 to 280 mm. It sets the end position and deceleration but does not lock the load without live air pressure.
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