Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-20
The AirTAC SAIJ125X40-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. Its defining feature is the external stopper that allows you to fine-tune the retract end-position during commissioning. With a nominal 40mm stroke and a 20mm adjustment code, this model provides a usable travel window of 20-40mm, letting you dial in the exact endpoint without swapping hardware.
Built with a carbon steel piston rod and a 32mm rod diameter, it handles substantial loads effectively. The extruded aluminum barrel features sensor grooves on both sides for flexible switch placement. It operates at speeds of 30-500mm/s and uses PT tapered port threads (G1/2) for secure pneumatic connections.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125X40-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125X40-20 Is Used
Heavy-Duty Clamping
Provides adjustable clamping depth for thick or variable materials, using the 20-40mm travel window to prevent over-travel on heavy press operations.
Product Changeover
Enables rapid line changeovers by allowing operators to dial back the stroke by up to 20mm for different product sizes without changing the cylinder.
Short-Stroke Ejection
Delivers 6136N of raw push force for ejecting dense parts from molds, with the rear stopper ensuring the ejection plate stops exactly where needed.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-20 the Right Cylinder?
Select this 125mm bore when an application requires heavy thrust (6136N push at 0.5MPa) over a very short, finely-tuned distance. If your force needs are lower, stepping down to a 100mm bore yields 3927N push force. The adjustable stroke is chosen over a fixed SAI cylinder when you need variable end-stops for product changeovers or precise machine setup. Because the 40mm stroke is well under the 300mm side-load threshold, external guides are less critical here, though the 32mm rod still provides excellent rigidity.
When matching an ISO 15552 replacement, verify the 125mm bore, 40mm stroke, 20mm adjustment range, PT port threads, and the specific mounting set. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR. Remember that the rear adjuster acts only as a travel stop, not a lock; for load-holding without live air pressure, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125X40-20 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 can deliver up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke from its 40mm nominal length down to as little as 20mm. This provides a 20-40mm travel window for fine-tuning the end position at commissioning.
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