Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-20
The AirTAC SAIJ125X500-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, letting you dial back the 500 mm nominal travel by up to 20 mm to achieve a precise 480-500 mm usable window. Built with a SUS420J2 stainless steel rod, it delivers 6136 N of push force at 0.5 MPa and reaches a maximum of 1251 kgf at 1.0 MPa.
Because the adjuster acts as a retract stop rather than a locking mechanism, it cannot hold loads without live air pressure. For position holding, consider the SAIL or BSAI variants. This model runs at 30-500 mm/s and uses PT tapered G1/2 ports, making it highly adaptable for heavy-duty machinery.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125AX500-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125AX500-20 Is Used
Heavy Press Tuning
Dial in the exact 480-500 mm travel window during press setup to accommodate varying material thicknesses without reinstalling the entire actuator.
Pallet Positioning
Adjust the retract stopper on the fly to shift the end-of-stroke position for different pallet sizes on a high-throughput packaging line.
Machine Changeover
Use the 20 mm rear adjustment screw to fine-tune the end position during product line changeovers, saving hours of mechanical repositioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-20 the Right Cylinder?
Choose this 125 mm bore when your application requires heavy thrust between the 80 mm bore (2513 N at 0.5 MPa) and the 160 mm bore (10053 N at 0.5 MPa). The adjustable stroke is ideal for fine-tuning end positions during machine commissioning or product changeover without swapping out the entire cylinder or adding external stops. To match this ISO 15552 replacement, verify the 500 mm stroke, 20 mm adjustment range, PT G1/2 port, and Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting interface.
Given the 500 mm stroke length, the 32 mm rod diameter and M27x2 thread provide robust support, but an external guide is strongly recommended to prevent excessive side-loading on the unsupported piston rod. Remember that the rear screw stopper and air cushions only decelerate the travel end; they do not function as a brake.
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 SAIJ125AX500-20 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At its maximum operating pressure of 1.0 MPa, it delivers up to 1251 kgf.
The rear adjuster acts as a mechanical stop that lets you shorten the 500 mm nominal stroke by up to 20 mm, creating a 480-500 mm usable travel window. It only sets the end position and does not lock the load without live air pressure.
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