Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-20S 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 SAIJ125AX500-20S
The AirTAC SAIJ125X500-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 500 mm stroke by up to 20 mm. This yields a precise 480-500 mm usable travel window, perfect for fine-tuning end positions at commissioning without adding external stops. Delivering 6136 N push force at 0.5 MPa, it handles heavy actuation tasks with ease.
This SKU features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a magnet (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel houses sensor grooves on both sides, and fluid is supplied via PT tapered ports (G1/2). It supports a speed range of 30-500 mm/s and includes adjustable air cushions at both ends to manage kinetic energy.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-20S |
|---|---|
| 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 SAIJ125AX500-20S
| 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 SAIJ125AX500-20S Is Used
Machine Setup & Changeover
Dial in the exact 480-500 mm end position during product size changes on a packaging line, using the 20 mm rear adjuster to fine-tune travel without replacing the cylinder.
Heavy Material Handling
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or chassis components, using the adjustable end-stop to account for slight variations in load dimensions.
Press & Forming Operations
Apply consistent clamping or pressing force with a 125 mm bore, tweaking the retraction point by up to 20 mm to accommodate different material thicknesses on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-20S the Right Cylinder?
Choose this 125 mm bore when your application requires substantial thrust—stepping up from a 100 mm bore gives you 6136 N push force at 0.5 MPa compared to the 100 mm's 3927 N, while dropping to an 80 mm bore drops force to 2513 N. The adjustable stroke is ideal for product changeovers on the line, letting you shift the end-stop by 20 mm without physically swapping the cylinder.
Because the stroke is 500 mm, the M27x2 rod and piston assembly will experience amplified leverage on the guide bearings; an external linear guide is recommended to prevent excessive side-loading and premature seal wear. Note that the rear adjuster acts purely as a travel stop and the air cushions only decelerate the load—neither will hold the load without live air. For true load-holding without pressure, consider an AirTAC SAIL or BSAI cylinder. This SAIJ uses the reduced mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, CR).
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 SAIJ125AX500-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to mechanically shorten the 500 mm nominal stroke by up to 20 mm, creating a 480-500 mm usable travel window. It acts as a physical stop to fine-tune the retract end position, but it is not a lock and cannot hold the load without continuous air pressure.
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