This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ40X75-40, 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 SIJ40X75-40
The AirTAC SIJ40 Double Shaft Adjustable Cylinder SIJ40X75-40 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ40X75-40, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAIJ40X75-40
- 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 SIJ40X75-40
The AirTAC SIJ40X75-40 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 40mm bore and 75mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 40mm on-site, yielding a usable 35-75mm extension. The SIJ series is discontinued; the direct replacement is the SAIJ40X75-40, matching the interface, force, and mounting.
The SAIJ upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet (-S) so it cannot take a sensor. The stop screw sets the end position but is not a load lock; for held loads use an external rod lock or SAIL/BSAI variant.
Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X75-40 Technical Specifications
| Model | Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X75-40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ40X75-40 |
| Bore size | Ø40 mm |
| Stroke | 75 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 SAIJ40X75-40 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 SAIJ40X75-40 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 SIJ40X75-40
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 SIJ40X75-40 Is Used
Adjustable End-Stop Pressing
Trimming the extend stroke by up to 40mm on-site allows precise positioning of light pressing tasks without machining custom spacers.
Variable Length Diverter
Field-tuning the 75mm extend stroke lets operators set the exact reach of a diverting gate to match changing package sizes.
Variable Depth Ejection
Shortening the extend stroke on the fly accommodates different carton depths on a packing line, ensuring positive ejection without overtravel.
Replacing the Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X75-40 with the SAIJ40X75-40
To replace the discontinued SIJ40X75-40, order the direct replacement SAIJ40X75-40, which preserves the 75mm nominal stroke, 40mm adjust window, G1/4 port, and M12x1.25 rod thread. Choose the 40mm adjust window if your extend stroke needs on-site tuning between 35mm and 75mm. Mounting options include Basic, FA, LB, and TC using genuine ISO 15552 interface dimensions. Because this SKU has no -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. The external stop sets end position but is not a lock; for load holding without live air, use an external rod lock or pilot-operated check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ40X75-40
- ✓ 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 SIJ40X75-40 FAQ
Yes, the SIJ40X75-40 is discontinued. The direct replacement is the SAIJ40X75-40, offering the same ISO 15552 interface, 40mm bore, 75mm stroke, 40mm adjust window, and G1/4 port.
The external stop screw allows you to trim the extend stroke by up to 40mm on-site, giving a usable 35-75mm extension window. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ40X75-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ40X75-40 replacement — usually within 7-8 hours.