Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-40S
The AirTAC SAIJ125X240-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 200 to 240 mm. It delivers 6136 N of push force at 0.5 MPa and features a SUS420J2 stainless steel rod (code A) for superior corrosion resistance. The integrated magnet (-S) enables direct position sensing with CMSE reed or DMSE electronic switches.
This adjustable-stroke design allows precise end-position tuning at commissioning without swapping the cylinder or adding external stops. The rear screw acts as a travel stop for product changeovers, while the standard ISO 15552 footprint ensures dimensional interchangeability. It uses a PT tapered port and includes variable air cushions at both ends to decelerate heavy loads smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAIJ125AX240-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SAIJ125AX240-40S Is Used
Product Size Changeovers
Dial in the 200-240 mm travel window during production line changeovers to accommodate varying package lengths without changing hardware.
Heavy Load Positioning
Leverage 6136 N of thrust at 0.5 MPa to push heavy pallets or workpieces into a precise machine stop, tuned exactly via the rear screw.
Commissioning Fine-Tuning
Trim the effective stroke by up to 40 mm during setup to perfect tooling alignment and avoid mechanical crashes without external shims.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-40S the Right Cylinder?
Choose this 125 mm bore when an application requires high thrust (6136 N push at 0.5 MPa) alongside variable end-stops. If you need less force, stepping down to a 100 mm bore yields 3927 N push at 0.5 MPa. The adjustable 200-240 mm window is ideal for machine setups requiring frequent product-size changes, unlike a fixed-stroke SAI cylinder. For load-holding without live air pressure, note that the rear adjuster is a stop, not a lock; you would need an external rod lock or a SAIL lock cylinder instead.
To match this ISO 15552 replacement exactly, specify: 125 mm bore, 240 mm nominal stroke, 40 mm adjustment, PT port thread, SUS420J2 rod material, and the -S magnet. Because the 240 mm stroke is under the 300 mm side-load threshold, the 32 mm rod handles standard loads well, though external guides are recommended for heavy lateral forces. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX240-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster screw lets you shorten the 240 mm nominal stroke by up to 40 mm, creating a usable travel window of 200 to 240 mm. The adjuster acts as a mechanical stop to set the end position, but it does not lock the load without live air pressure.
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