This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ40X225-50S, 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 SIJ40X225-50S
The AirTAC SIJ40 Double Shaft Adjustable Cylinder SIJ40X225-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 225mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ40X225-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke225 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAIJ40X225-50S
- 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 SIJ40X225-50S
The AirTAC SIJ40X225-50S 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 175-225 mm window from the 225 mm nominal maximum. As an end-of-life product, the direct replacement is the SAIJ40X225-50S, retaining the exact ISO 15552 mounting interface, force, and adjust window.
The SAIJ replacement incorporates an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. Remember the stop screw sets the end position but is not a load lock; the cylinder drifts on air loss. For held loads, specify an external rod lock or the SAIL/BSAI lock variants.
Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X225-50S Technical Specifications
| Model | Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X225-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ40X225-50S |
| Bore size | Ø40 mm |
| Stroke | 225 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 SAIJ40X225-50S 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 SAIJ40X225-50S 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 SIJ40X225-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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 SIJ40X225-50S Is Used
Variable Pitch Pushing
Tuning the extend stroke on-site by up to 50 mm allows a single cylinder to push parts into fixtures at varying depths without changing the entire actuator assembly.
Adjustable Transfer Stops
Field-trimming the extend stroke lets operators raise or lower a conveyor stopper pin height precisely, accommodating different product sizes on the same line.
Forming Stroke Calibration
Adjusting the end position on a packaging former provides a 175-225 mm usable window to dial in the exact material fold depth during machine commissioning.
Replacing the Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X225-50S with the SAIJ40X225-50S
To replace the discontinued SIJ40X225-50S, specify SAIJ40X225-50S for an direct swap matching the 40 mm bore, 225 mm stroke, 50 mm adjust window, G1/4 port, and -S magnet. Choose the 50 mm adjust window if your field tuning requires trimming up to 50 mm off the maximum extend; the stop sets end position and is not a lock. Mounting options include Basic, FA, LB, and TC brackets. The -S suffix means a piston magnet is present for CS1-B/DS1-B switches (the SAIJ uses current AirTAC switches). For strokes of 300 mm or longer, verify side-load limits to prevent guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ40X225-50S
- ✓ 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 SIJ40X225-50S FAQ
Yes, the SIJ40X225-50S is discontinued. The direct replacement is the SAIJ40X225-50S. It shares the same ISO 15552 interface, 40 mm bore, 225 mm stroke, 50 mm adjust window, G1/4 port, and mounting options, while adding an upgraded piston seal.
The external stop screw provides a 50 mm adjust window, allowing the extend stroke to be shortened from the 225 mm nominal maximum down to 175 mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ40X225-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ40X225-50S replacement — usually within 7-8 hours.