Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-30S
The AirTAC SAIJ125X250-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 220-250 mm usable travel window from the 250 mm nominal stroke. Delivering 8590 N of push force at 0.7 MPa, it handles heavy-duty positioning. The rod is constructed from SUS420J2 stainless steel (code A) for enhanced corrosion resistance, and the -S magnet enables precise end-position detection using AirTAC CMSE reed and DMSE solid-state sensors housed in the dual-side sensor grooves.
This model utilizes PT tapered ports sized at G1/2. The rear adjustment screw acts purely as a mechanical stop to decelerate the retract end-position, meaning it will not hold a load without continuous live air pressure. For secure load-holding during an air loss event, an external pilot-operated check valve or related AirTAC locking cylinders like SAIL or BSAI are required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125AX250-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAIJ125AX250-30S Is Used
Product Changeover Tuning
Dial in the 220-250 mm retract end-position during format size changes on packaging lines without swapping out the physical cylinder.
Heavy Press Positioning
Leverage the 8590 N push force at 0.7 MPa to seat heavy components, using the rear stop to guarantee precise final placement.
Automated Assembly Stops
Use the SUS420J2 stainless steel rod in varied manufacturing cells, relying on DMSE solid-state sensors to confirm stroke endpoints.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-30S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (providing 5497 N push at 0.7 MPa) lacks the necessary thrust, but a 160 mm bore (14074 N push) would be excessive. The 30 mm adjustable stop is selected over a fixed-stroke SAI when a machine requires rapid product-size changeovers or fine end-position tuning at commissioning without physically swapping the cylinder or adding external stops. To guarantee a drop-in ISO 15552 replacement, match the 125 mm bore, 250 mm stroke, 30 mm adjuster, PT G1/2 ports, and the -S magnet.
Because the 250 mm stroke approaches lengths where side loading becomes a concern, always guide the load externally to prevent rod binding. The approved mounting set for the SAIJ series includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets.
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 SAIJ125AX250-30S FAQ
The rear adjuster screw lets you shorten the effective retract travel by up to 30 mm, providing a 220-250 mm adjustable window. It functions as a mechanical stop to set the end position and does not lock the load without live air pressure.
At an operating pressure of 0.7 MPa, the SAIJ125X250-30-S generates a push force of 8590 N and a pull force of 5734 N. The maximum speed for this 125 mm bore is 30-500 mm/s.
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