Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 270mm 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
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-20
The AirTAC SAIJ125X270-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 250-270 mm from its 270 mm nominal stroke. It delivers 8590 N of push force and 5734 N of pull force at 0.7 MPa, making it suited for heavy-duty positioning. The piston rod is constructed from SUS420J2 stainless steel for enhanced durability against moisture.
This model features a PT tapered port thread and adjustable air cushions at both ends to manage kinetic energy. The rear adjustment screw acts purely as a travel stop to dial in the end position during commissioning without adding external stops. It is not a locking mechanism, so live air pressure is required to hold the load in place.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 270 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 SAIJ125AX270-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SAIJ125AX270-20 Is Used
Product Changeover
Dial in the 250-270 mm travel window during format changes on packaging lines without replacing the cylinder.
Heavy Pressing
Leverage the 8590 N push force at 0.7 MPa for securely seating heavy industrial components.
Variable End-Stop
Use the rear adjuster to fine-tune the retract position during machine setup and commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-20 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial force, as it yields 6136 N of push force at 0.5 MPa. If your process demands less energy, stepping down to a 100 mm bore provides 3927 N at 0.5 MPa. The 20 mm adjustment range is ideal for machinery requiring variable end-stops for product changeovers, negating the need to physically swap out a fixed-stroke SAI cylinder.
For load-holding without continuous air pressure, this standard adjuster will not suffice; consider an SAIL pneumatic lock or BSAI clamp-lock cylinder instead. Because the 270 mm stroke is relatively long, an external guide is recommended to prevent excessive side-loading on the rod. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX270-20 FAQ
The rear adjuster screw lets you trim the effective travel back by up to 20 mm, creating a 250-270 mm usable window. It functions as a hard stop for end-position tuning and does not lock the load without live air.
At an operating pressure of 0.7 MPa, it provides 8590 N of push force and 5734 N of pull force. The maximum push force is 11045 N at 0.9 MPa.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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