Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-20 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 SAIJ125AX280-20
The AirTAC SAIJ125X280-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to dial back the 280 mm nominal stroke by up to 20 mm. This creates a precise 260-280 mm usable travel window, allowing you to fine-tune the retract end position at commissioning without swapping the cylinder or adding external stops. It delivers a robust 6136 N push force at 0.5 MPa and features a SUS420J2 stainless steel rod for enhanced durability.
This model uses a PT G1/2 port and operates at speeds of 30-500 mm/s. The rear adjuster acts as a travel stop for deceleration, not a lock, meaning it will not hold a load without live air. For load-holding applications, consider the SAIL or BSAI series. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU is non-magnetic and does not support CMSE or DMSE switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-20 |
|---|---|
| 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 SAIJ125AX280-20
| 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 SAIJ125AX280-20 Is Used
Machine Setup & Changeover
Fine-tune the 260-280 mm retract position on the fly during product size changes without bolting on external stops or swapping cylinders.
Variable End-Stop Positioning
Dial in the exact end-of-stroke location during commissioning to accommodate mechanical tolerances and ensure precise product handling.
Heavy-Duty Assembly Lines
Leverage the 6136 N push force to drive large clamping or lifting mechanisms, adjusting the travel window as tooling wears over time.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-20 the Right Cylinder?
Choose this 125 mm bore when your application requires the 6136 N push force at 0.5 MPa, stepping up from a 100 mm bore that provides 3927 N. The adjustable stroke is ideal for machine setups requiring variable end-stops during product changeovers, rather than relying on a fixed-stroke SAI cylinder. When matching your ISO 15552 interchangeable replacement, verify the 280 mm stroke, 20 mm adjustment range, PT G1/2 port, and SUS420J2 rod material.
Since the 280 mm stroke exceeds 300 mm? No, but even at 280 mm, long unsupported strokes can generate significant side loads; ensure you use an external guide to prevent rod damage. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options.
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 SAIJ125AX280-20 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach up to 1251 kgf at 1.0 MPa.
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm from the 280 mm nominal length, creating a 260-280 mm travel window. It acts as a stop for end-position tuning and is not a lock.
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