Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-75S
The AirTAC SAIJ125X425-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5MPa (8590N at 0.7MPa) and features a 425mm nominal stroke that can be fine-tuned down by up to 75mm, providing a usable travel window of 350-425mm. This built-in adjustability allows operators to dial in exact end positions during commissioning without swapping out the entire cylinder or fabricating external stops.
This SKU features an SUS420J2 stainless steel rod (material code A) for superior corrosion resistance and includes a magnet (-S) for position sensing via AirTAC CMSE reed or DMSE electronic solid-state switches mounted in the dual-side sensor grooves. With a PT tapered G1/2 port and a 32mm rod diameter, the robust design handles heavy loads, while the rear stopper purely sets the travel end and does not function as a lock to hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAIJ125AX425-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAIJ125AX425-75S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 350mm and 425mm during product changeovers, eliminating the need to physically swap cylinders or add external mechanical stops.
Heavy-Duty Forming Press
Leverage the 6136N push force at 0.5MPa to drive heavy forming or stamping operations, using the rear adjuster to precisely tune the bottoming position for different material thicknesses.
Automated Assembly Line
Utilize the -S magnet with DMSE electronic sensors to confirm end-of-stroke positions on large assembly jigs, adjusting the 75mm travel window on the fly for new product dimensions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-75S the Right Cylinder?
Select this 125mm bore cylinder when an application requires heavy thrust—such as 6136N push at 0.5MPa—combined with variable end-stop positioning. If your setup needs less force, stepping down to a 100mm bore yields 3927N push at 0.5MPa, whereas moving up to a 160mm bore provides 10053N. Because the 425mm stroke is substantial, ensure an external guide supports the load to prevent excessive side-loading on the rod, as the rear adjuster only decelerates and sets the travel end, functioning neither as a lock nor a brake. For load-holding without continuous air pressure, consider the SAIL or BSAI variants.
To match this ISO 15552 dimensionally interchangeable profile cylinder exactly, confirm the 425mm stroke, 75mm adjustment range, PT G1/2 port, SUS420J2 rod, and -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR options. Operating speed for this bore size is rated at 30-500mm/s.
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 SAIJ125AX425-75S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If operating at 0.7MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 425mm nominal stroke by up to 75mm, creating a usable travel window of 350-425mm. It only sets the travel end and does not lock the load without live air pressure.
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