This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X45-40S, 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 SIJ50 Double Rod Adjustable Cylinder SIJ50X45-40S
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X45-40S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 45mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ50X45-40S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke45 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ50X45-40S
- 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 SIJ50 Double Rod Adjustable Cylinder SIJ50X45-40S
The AirTAC SIJ50X45-40S 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 40mm on-site, giving a usable 5-45mm window from the 45mm nominal maximum. The stop screw sets the end position but is not a load lock.
The direct replacement is the SAIJ50X45-40S, sharing the same interface, force, and mounting. The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X45-40S Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X45-40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X45-40S |
| Bore size | Ø50 mm |
| Stroke | 45 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ50X45-40S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAIJ50X45-40S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X45-40S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×45 | 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 SIJ50 Double Rod Adjustable Cylinder SIJ50X45-40S Is Used
Variable Depth Forming
Adjusting the extend stroke on-site by up to 40mm allows a single cylinder to press parts to varying depths without swapping the entire actuator.
Adjustable Diverter Gate
Tuning the extend end position lets a diverter gate accommodate different package sizes on the fly, ensuring precise routing on the line.
Custom Carton Sealing
The field-adjustable stop screw provides exact flap folding pressure for varying carton heights, preventing crush damage during the sealing cycle.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X45-40S with the SAIJ50X45-40S
To replace the discontinued SIJ50X45-40S, map directly to the SAIJ50X45-40S. Choose the 40mm adjust window if you need field tuning between 5 and 45mm. Mounting options include FA, LB, and TC brackets. The -S suffix ensures a piston magnet is present. Since the stroke is under 300mm, side-load risks are minimal. Note that air cushions only decelerate near stroke end; for load holding on air loss, use an external rod lock or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X45-40S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X45-40S FAQ
Yes, the SIJ50X45-40S is discontinued. The direct replacement is the SAIJ50X45-40S. It shares the same ISO 15552 interface, 50mm bore, 45mm stroke, 40mm adjust window, G1/4 port, and mounting options. The SAIJ also features an upgraded two Y-shaped one-way piston seal for longer life.
The external stop screw provides a 40mm adjust window, allowing the 45mm nominal extend stroke to be shortened down to 5mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X45-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X45-40S replacement — usually within 7-8 hours.