Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 220mm 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
- Stroke220 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-20S
The AirTAC SAIJ125X220-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to dial the effective travel back to a 200-220 mm window. It delivers 6136 N push force at 0.5 MPa, scaling to 11045 N at 0.9 MPa, making it ideal for heavy-duty positioning. The extruded aluminum barrel features sensor grooves on both sides, and this -S variant includes a magnet for precise detection via CMSE reed or DMSE electronic switches.
This model uses an SUS420J2 stainless steel rod for enhanced corrosion resistance and supports a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) without FB, CA, CB, or CR options. The rear adjuster acts purely as a travel stop to fine-tune the end position during commissioning; it does not hold the load without live air.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 220 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 SAIJ125AX220-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×220 | 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 SAIJ125AX220-20S Is Used
Product Changeovers
Dial in the 200-220 mm travel window during format size changes on packaging lines without physically swapping the actuator.
Heavy Pressing
Leverage the 11045 N force at 0.9 MPa for secure pressing operations, tuning the exact end-stop to avoid over-travel.
Machine Setup
Fine-tune the retract end-position at commissioning using the rear screw, eliminating the need to bolt on external stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX220-20S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (offering 3927 N push at 0.5 MPa) cannot provide enough force, but a 160 mm bore (10053 N) is physically oversized. The 20 mm adjustment range is selected over a fixed-stroke SAI when you need variable end-stops for product changeovers without swapping the cylinder. Because the 220 mm stroke exceeds 300 mm? No, but for any long-stroke setup, the 32 mm rod and M27x2 thread handle high side-loads, though an external guide is still recommended for unsupported loads.
To match this ISO 15552 cylinder, specify a 125 mm bore, 220 mm stroke, 20 mm adjustment, PT tapered G1/2 port, and the -S magnet. For load-holding without live pressure, the rear adjuster and air cushion act only as a deceleration stop, so you must integrate an external rod lock or pilot-operated check valve, or switch to an AirTAC SAIL or BSAI series.
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 SAIJ125AX220-20S FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.9 MPa the push force increases to 11045 N.
The rear adjuster allows you to shorten the 220 mm nominal stroke by up to 20 mm, creating a 200-220 mm usable travel window for precise end-position tuning.
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