This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ40X300-50S, 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 SIJ40X300-50S
The AirTAC SIJ40 Double Shaft Adjustable Cylinder SIJ40X300-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ40X300-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAIJ40X300-50S
- 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 SIJ40X300-50S
The AirTAC SIJ40X300-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, yielding a usable 250-300 mm stroke from the 300 mm nominal maximum.
The direct replacement is the SAIJ40X300-50S, preserving the ISO 15552 mounting interface, bore, force, and adjust window. The SAIJ upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Note the stop screw sets end position only; it is not a load lock.
Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X300-50S Technical Specifications
| Model | Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X300-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ40X300-50S |
| Bore size | Ø40 mm |
| Stroke | 300 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 SAIJ40X300-50S 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 SAIJ40X300-50S 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 SIJ40X300-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 SIJ40X300-50S Is Used
Variable Depth Drilling
Adjusting the extend stroke on-site by up to 50 mm allows a drill head to hit multiple material depths without swapping cylinders.
Variable Length Sorting Diverter
Trimming the extend stroke accommodates different package lengths on a sorting line, ensuring precise physical contact.
Adjustable Forming Press
Tuning the 250-300 mm extend stroke on a packaging former adapts the machine to varying carton heights quickly.
Replacing the Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X300-50S with the SAIJ40X300-50S
To replace the discontinued SIJ40X300-50S, order the direct replacement SAIJ40X300-50S, which retains the G1/4 port, M12x1.25 rod thread, and 50 mm adjust window. Choose the -50 adjust window if you need up to 50 mm of field stroke tuning; the stop screw sets the end position but does not lock the load. FA, LB, and TC mountings reuse existing ISO 15552 fixtures. The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B switches (the SAIJ uses current AirTAC switches). For the 300 mm stroke, use external guides to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ40X300-50S
- ✓ 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 SIJ40X300-50S FAQ
Yes, the SIJ40X300-50S is discontinued. The direct replacement is the SAIJ40X300-50S, which shares the identical ISO 15552 interface, 40 mm bore, 300 mm stroke, 50 mm adjust window, and G1/4 port. The SAIJ family also adds an upgraded two Y-shaped one-way piston seal.
The external stop screw provides a 50 mm adjust window, allowing you to trim the extend stroke from the 300 mm maximum down to 250 mm on-site. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ40X300-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ40X300-50S replacement — usually within 7-8 hours.