Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-50S
The AirTAC SAIJ125X350-50-S is a double-acting ISO 15552 profile cylinder with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a 50 mm adjustment range, creating a usable travel window between 300 and 350 mm. This allows operators to fine-tune end positions at commissioning without swapping hardware. The extruded aluminum barrel includes dual sensor grooves, and the -S magnet supports AirTAC CMSE reed and DMSE electronic solid-state switches for precise position detection.
Equipped with a SUS420J2 stainless steel rod (material code A), this 125 mm bore unit handles demanding environments better than standard carbon steel. It uses a PT tapered port and operates at speeds of 30-500 mm/s. The rear adjuster acts strictly as a travel stop for deceleration, not a lock, so live air is required to hold the load. For true position holding without pressure, an external rod lock or AirTAC SAIL cylinder is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125AX350-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SAIJ125AX350-50S Is Used
Machine Setup & Changeover
Fine-tune the 300-350 mm travel window during product size transitions on packaging lines without physically replacing the cylinder.
Variable End-Stop Diverting
Adjust the retract position on the fly to handle different package lengths on a conveyor system, using the rear screw to set the exact stop point.
Heavy-Duty Press Tunning
Dial in the exact end-of-stroke position for high-force assembly presses, leveraging the 6136N thrust at 0.5 MPa for reliable actuation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-50S the Right Cylinder?
Choose this 125 mm bore when an application demands high force—6136N at 0.5 MPa or 8590N at 0.7 MPa—alongside variable end-stops. If a smaller footprint is acceptable, stepping down to a 100 mm bore yields 3927N at 0.5 MPa, whereas moving up to a 160 mm bore provides 10053N. The 50 mm adjustment window is ideal for product changeovers, letting you dial in the exact 300 to 350 mm travel without adding external stops or replacing a fixed-stroke SAI cylinder.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 350 mm nominal stroke, 50 mm adjustment, PT port, and -S magnet. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the stroke is 350 mm, the 32 mm rod and M27x2 thread still require an external guide to prevent side-loading damage on long unsupported travels.
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 SAIJ125AX350-50S FAQ
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke by up to 50 mm. This creates a usable travel window of 300 to 350 mm, enabling fine end-position tuning without changing the cylinder or adding external stops.
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
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