Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 20mm 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
- Stroke20 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-20
The AirTAC SAIJ125X20-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5MPa. Its 20mm nominal stroke can be dialed back by up to 20mm, providing a 0-20mm usable travel window for exact end-position tuning without swapping components.
This bore features a 32mm carbon steel rod with an M27x2 thread, paired with a PT G1/2 port and 40mm cushions to manage heavy kinetic energy. It supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, explicitly omitting FB, CA, CB, and CR brackets.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 20 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 SAIJ125X20-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×20 | 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 SAIJ125X20-20 Is Used
Short-Stroke Pressing
Dial in the exact 0-20mm contact travel for high-force pressing or staking operations, ensuring precise depth control on variable product thicknesses.
Machine Changeover
Quickly adjust the rear stopper during product size changeovers to set new end positions without physically replacing the cylinder or adding external stops.
Heavy Clamping Fixtures
Utilize the 6136N thrust at 0.5MPa for robust clamping of large parts, using the adjustable stroke to fine-tune clamp clearance during setup.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-20 the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (3927N push at 0.5MPa) lacks thrust, but a 160mm bore is physically oversized. The adjustable rear stopper is ideal for fine-tuning short 0-20mm movements during machine setup or product changeover, rather than relying on a fixed-stroke SAI cylinder.
Because the rear adjuster acts only as a travel stop and the air cushion handles deceleration, neither will hold a load without live air pressure. For dead-load holding, specify an external rod lock or select an AirTAC SAIL or BSAI cylinder. To match this ISO 15552 replacement exactly, verify the 20mm stroke, 20mm adjustment, PT G1/2 port, and required mounting bracket.
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 SAIJ125X20-20 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.9MPa, the push force increases to 11045N.
The rear adjuster screw allows you to shorten the 20mm nominal stroke by up to 20mm, creating a 0-20mm adjustable travel window. This stopper sets the end position but does not lock the load without continuous air pressure.
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