Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-30S 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 SAIJ125AX240-30S
The AirTAC SAIJ125X240-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 125mm bore, delivering 6136N of push force and 5734N of pull force at 0.5 MPa. The built-in rear stopper allows you to trim the effective travel, creating a 210-240mm usable window from the 240mm nominal stroke without adding external stops.
This unit includes a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and carries the -S magnet option for position sensing. It integrates seamlessly with AirTAC CMSE reed and DMSE solid-state switches via the dual-side sensor grooves on the extruded aluminum barrel. The variable air cushions at both ends decelerate the load, but note that the adjuster is a travel stop, not a lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-30S |
|---|---|
| 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 SAIJ125AX240-30S
| 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 SAIJ125AX240-30S Is Used
Product Changeover
Dial in the exact end-stop for varying product lengths on a single line using the 30mm adjustment window, eliminating the need to physically swap out cylinders.
Diversion Gate
Provides the 6136N push force needed to actuate heavy sorting flaps, with the rear stopper allowing fine-tuning of the gate's extended position.
Press Clamping
Holds workpieces securely during machining operations, using the SUS420J2 stainless steel rod to resist corrosion in coolant-heavy environments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-30S the Right Cylinder?
Select this 125mm bore when an application requires substantial thrust—6136N at 0.5 MPa or up to 11045N at 0.9 MPa. If your process needs less force, stepping down to an 80mm bore yields 2513N at 0.5 MPa, whereas a 160mm bore provides 10053N for heavier loads. The adjustable stroke is ideal for machine changeovers, allowing precise end-position tuning at commissioning without swapping the cylinder.
To match this ISO 15552 footprint, specify the 125mm bore, 240mm stroke, 30mm adjustment range, PT tapered port thread, and the -S magnet. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Because the stroke is 240mm, ensure external guidance to handle side loads. The rear adjuster and air cushions only manage end-of-travel deceleration; for load holding without live air pressure, use a SAIL air-released lock, a BSAI clamp-lock, or an external rod lock.
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 SAIJ125AX240-30S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum operating pressure of 1.0 MPa, it delivers up to 1251 kgf.
The rear adjusting screw acts as a mechanical stop, allowing you to shorten the effective travel from the 240mm nominal stroke down to 210mm. This enables fine-tuning of the end position during commissioning, but it does not lock the load without live air pressure.
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