Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-30S 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 SAIJ125AX270-30S
The AirTAC SAIJ125X270-30-S is a double-acting, single-rod ISO 15552 profile cylinder featuring an integrated rear stroke adjuster. It provides a 240 to 270 mm usable travel window, allowing you to dial back the nominal 270 mm stroke by up to 30 mm during commissioning without adding external stops. With a 125 mm bore, it delivers 6136 N of pull force at 0.5 MPa and reaches a maximum of 1251 kgf at 1.0 MPa.
This unit includes a -S magnet for position sensing with AirTAC CMSE reed and DMSE solid-state switches. The piston rod is built from SUS420J2 stainless steel for superior corrosion resistance, and the body uses an extruded aluminum barrel with sensor grooves on both sides. The rear adjuster acts strictly as a travel stop to fine-tune deceleration, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-30S |
|---|---|
| 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 SAIJ125AX270-30S
| 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 SAIJ125AX270-30S Is Used
Machine Changeover
Quickly fine-tune the 240-270 mm end-stop during product size transitions on a packaging line without swapping out the entire cylinder.
Variable End-Stop Setup
Dial in the exact retract position during machine commissioning to accommodate varying material thicknesses or tooling offsets.
Heavy-Duty Positioning
Leverage the 6136 N pull force to move substantial jigs or fixtures while maintaining the ability to trim the stroke by up to 30 mm on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-30S the Right Cylinder?
Choose this adjustable-stroke model when a fixed 270 mm stroke SAI cylinder lacks the flexibility needed for machine changeovers or product-size variations. If your application requires less force, stepping down to a 100 mm bore yields 3681 N of pull force at 0.5 MPa; conversely, a 160 mm bore provides 9425 N for heavier loads. The SAIJ125X270-30-S uses PT G1/2 porting and operates at speeds of 30-500 mm/s.
For load-holding without continuous air pressure, this cylinder is not sufficient as the rear adjuster is only a stop, not a lock. You would need an external rod lock, a pilot-operated check valve, or a related AirTAC type like the SAIL (air-released lock) or BSAI (clamp-lock). Because the 270 mm stroke is moderately long, ensure adequate external guiding to prevent excessive side-loading on the 32 mm stainless steel rod. This cylinder is dimensionally interchangeable per ISO 15552 and uses a mounting set of 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 SAIJ125AX270-30S FAQ
The rear adjuster screw allows you to shorten the effective travel from the nominal 270 mm down to 240 mm, providing a 30 mm adjustable window. It acts as a mechanical stop to tune the end position, but it does not lock or hold the load without live air pressure.
At a standard 0.5 MPa operating pressure, the SAIJ125X270-30-S generates 6136 N of pull force and 6136 N of push force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
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