This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ40X125-50S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X125-50S
The AirTAC SIJ40 Double Shaft Adjustable Cylinder SIJ40X125-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ40X125-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAIJ40X125-50S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X125-50S
The AirTAC SIJ40X125-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. Its external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable extend range of 75-125 mm from the 125 mm nominal maximum. The direct replacement is the SAIJ40X125-50S, retaining the same interface, force, and mounting.
The SAIJ upgrade features a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The stop screw sets end position but is not a load lock; use an external rod lock or SAIL/BSAI variant for held loads. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X125-50S Technical Specifications
| Model | Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X125-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ40X125-50S |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ40X125-50S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAIJ40X125-50S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X125-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X125-50S Is Used
Variable Depth Forming
Allows operators to trim the extend stroke by up to 50 mm on-site to accommodate different material thicknesses in pressing applications without changing the cylinder.
Adjustable Diverter Arms
Provides a usable extend range of 75-125 mm to alter the reach of sorting gates on a conveyor line as package sizes change.
Tuning Sealing Jaws
Enables precise field adjustment of the end position for carton sealing jaws, ensuring correct contact pressure for varied box heights.
Replacing the Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X125-50S with the SAIJ40X125-50S
To replace the discontinued SIJ40X125-50S, order the direct replacement SAIJ40X125-50S, which preserves the 50 mm adjust window, 125 mm max stroke, G1/4 port, and ISO 15552 mounting interfaces (Basic, FA, LB, TC). Choose the 50 mm adjust window if your application requires field tuning the extend stroke between 75 and 125 mm. The -S suffix ensures a piston magnet is present for switch sensing. For strokes of 300 mm or longer, verify side-load limits to prevent rod distortion.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ40X125-50S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X125-50S FAQ
Yes, the AirTAC SIJ40X125-50S is discontinued. The direct replacement is the SAIJ40X125-50S, which matches the ISO 15552 interface, bore, stroke, force, G1/4 port, and mounting options. The SAIJ family also adds an upgraded two Y-shaped one-way piston seal for lower start-up pressure and longer life.
The external stop screw provides a 50 mm adjust window, allowing the 125 mm nominal extend stroke to be shortened to a minimum of 75 mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ40X125-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ40X125-50S replacement — usually within 7-8 hours.