Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-50
The AirTAC SAIJ125X50-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N push force at 0.5 MPa. It features a SUS420J2 stainless steel rod for enhanced corrosion resistance and PT tapered port threads. The integrated rear adjusting screw allows you to shorten the effective travel, creating a 0 to 50mm usable stroke window from the 50mm nominal length without adding external stops.
Because the adjuster acts purely as a mechanical stop on the retract end, it does not hold the load without live air pressure. The extruded aluminum barrel includes sensor grooves on both sides, ready for position feedback. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR variants to streamline changeover setups.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125AX50-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAIJ125AX50-50 Is Used
Variable End-Stop Clamping
Dial in the exact clamping depth for varying workpiece heights using the 0-50mm rear adjustment screw, ensuring optimal pressure without repositioning the cylinder.
Machine Setup Changeover
Quickly adapt end-of-stroke positions during product line changeovers, reducing downtime by tuning the travel window directly at the cylinder.
High-Force Positioning
Leverage the 6136N push force of the 125mm bore to move and position heavy assemblies while retaining the flexibility to fine-tune the final retract position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-50 the Right Cylinder?
Choose this 125mm bore when an application demands high thrust (6136N at 0.5 MPa) alongside precise end-position tuning during commissioning. If you need less force, stepping down to a 100mm bore yields 3927N push force, but this SAIJ125X50-50 is ideal when you must dial in a variable end-stop for product-size changes on a line. The rear adjuster provides this fine-tuning capability without swapping the cylinder.
For exact ISO 15552 replacement matching, verify the 125mm bore, 50mm nominal stroke, 50mm adjustment range, PT port threads, and required mounting bracket. Note that a plain SAIJ does not hold position or load without live air; for load-holding without pressure, select an AirTAC SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead.
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 SAIJ125AX50-50 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder generates 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it provides up to 1251 kgf of push force.
The rear adjusting screw acts as a mechanical stop that lets you trim the effective stroke back by up to 50mm. Since the nominal stroke is 50mm, this creates a 0 to 50mm usable travel window, allowing precise end-position tuning at commissioning without external stops.
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