This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ40X350-50S, 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 SIJ40X350-50S
The AirTAC SIJ40 Double Shaft Adjustable Cylinder SIJ40X350-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 350mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ40X350-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAIJ40X350-50S
- 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 SIJ40X350-50S
The AirTAC SIJ40X350-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 40mm bore and 350mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 50mm on-site, giving a usable 300-350mm window. This model is discontinued; the direct replacement is the SAIJ40X350-50S, retaining the same interface, force, and mounting.
The SAIJ upgrade uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The stop screw sets end position but is not a load lock; for held loads use an external rod lock or SAIL/BSAI variant. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X350-50S Technical Specifications
| Model | Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X350-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ40X350-50S |
| Bore size | Ø40 mm |
| Stroke | 350 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 SAIJ40X350-50S 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 SAIJ40X350-50S 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 SIJ40X350-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 SIJ40X350-50S Is Used
Variable Depth Drilling
Allows operators to tune the 350mm extend stroke down by up to 50mm on-site to accommodate varying material thicknesses without changing the cylinder.
Adjustable Carton Sealing
Provides field stroke tuning for packaging lines handling different box heights, ensuring precise end-positioning via the external stop screw.
Variable Position Diverter
Enables exact extend stops along a conveyor to sort items into multiple lanes, trimming the stroke by up to 50mm as needed for layout changes.
Replacing the Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X350-50S with the SAIJ40X350-50S
To replace the discontinued SIJ40X350-50S, order the direct replacement SAIJ40X350-50S, which preserves the 40mm bore, 350mm nominal stroke, 50mm adjust window, G1/4 port, and ISO 15552 mounting. Choose the 50mm adjust window if you need on-site extend tuning between 300mm and 350mm. Mounting options include Basic, FA, LB, and TC. The -S suffix ensures a piston magnet for position sensing. Because the 350mm stroke is long, account for side-load and rod-bending forces by using external guides to prevent premature wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ40X350-50S
- ✓ 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 SIJ40X350-50S FAQ
Yes, the SIJ40X350-50S is discontinued. The direct replacement is the SAIJ40X350-50S. It shares the same ISO 15552 interface, 40mm bore, 350mm stroke, 50mm adjust window, and G1/4 port, but adds an upgraded piston seal for longer life.
The external stop screw provides a 50mm adjustment window, allowing the extend stroke to be shortened from 350mm down to 300mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ40X350-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ40X350-50S replacement — usually within 7-8 hours.