Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-20S
The AirTAC SAIJ125X240-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 220 to 240 mm. It delivers a robust 6136 N push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks. This variant includes a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and a built-in magnet for position sensing.
The rear adjustment screw allows operators to fine-tune the retract end position during commissioning without adding external stops. It uses a PT tapered port thread and operates at speeds of 30-500 mm/s. The adjuster acts strictly as a travel stop and does not hold the load without live air pressure; for load-holding requirements, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAIJ125AX240-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SAIJ125AX240-20S Is Used
Product Changeover
Quickly dial in the 220-240 mm travel window during format changes on packaging lines without swapping out the entire actuator.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or fixtures, using the rear stop to fine-tune the final resting position.
Machine Setup
Use the rear adjuster during initial commissioning to set precise end-of-stroke limits, eliminating the need for external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-20S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial force—stepping down to a 100 mm bore drops the 0.5 MPa push force to 3927 N, while stepping up to a 160 mm bore increases it to 10053 N. The adjustable stroke is ideal for product changeovers on a line, allowing the end-stop to be dialed in precisely. Because the stroke is 240 mm, ensure adequate external guiding to prevent excessive side-loading on the rod.
For a true ISO 15552 replacement match, verify the 125 mm bore, 240 mm nominal stroke, 20 mm adjustment range, PT port thread, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. The integrated magnet works seamlessly with AirTAC CMSE reed and DMSE electronic solid-state sensors.
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 SAIJ125AX240-20S FAQ
At 0.5 MPa, it provides a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm, creating a usable travel window of 220 to 240 mm. It acts as a mechanical stop and does not lock the load without air pressure.
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