Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-20S 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 SAIJ125AX280-20S
The AirTAC SAIJ125X280-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 260-280 mm usable travel window, allowing you to dial back the 280 mm nominal stroke by up to 20 mm during commissioning. Equipped with a SUS420J2 stainless steel rod (material code A) and a built-in magnet, it integrates seamlessly with AirTAC CMSE reed and DMSE electronic sensors via the dual-side extruded aluminum barrel grooves.
Delivering 6136 N of pull force at 0.5 MPa and up to 11045 N at 0.9 MPa, this bore size handles heavy loads. The rear adjuster acts purely as a mechanical stop to fine-tune the end position and does not hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-20S |
|---|---|
| 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 SAIJ125AX280-20S
| 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 SAIJ125AX280-20S Is Used
Machine Changeover
Fine-tune the 260-280 mm travel window during product size transitions without swapping out the entire cylinder or bolting on external stops.
Heavy Pressing
Leverage the 11045 N push force at 0.9 MPa for rigid pressing operations, using the rear screw to dial in the exact contact depth.
Automated Assembly
Utilize the dual-side sensor grooves with DMSE electronic switches to confirm end-of-stroke positions accurately on high-speed lines.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-20S the Right Cylinder?
Choose this 125 mm bore when your application requires higher force than the 80 mm bore (which provides 2268 N pull at 0.5 MPa) but less bulk than the 160 mm option. The adjustable stroke is ideal for product changeovers or fine-tuning end positions without adding external stops. Because the 280 mm stroke exceeds 300 mm is not the case here, but for longer unsupported travels, an external guide is recommended to manage side loads.
To replace an ISO 15552 cylinder, match the 125 mm bore, 280 mm stroke, 20 mm adjustment, PT tapered port, and -S magnet. SAIJ supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. The 32 mm rod and M27x2 thread provide robust connectivity for heavy-duty tooling.
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 SAIJ125AX280-20S FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.9 MPa, the push force reaches 11045 N.
The rear adjuster screw lets you shorten the effective travel from 280 mm down to 260 mm. It functions as a travel stop for end-position tuning, not as a lock, meaning it will not hold the load without live air pressure.
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