This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ40X75-75, 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 SIJ40X75-75
The AirTAC SIJ40 Double Shaft Adjustable Cylinder SIJ40X75-75 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 SAIJ40X75-75, 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 → SAIJ40X75-75
- 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 SIJ40X75-75
The AirTAC SIJ40X75-75 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 75 mm on-site, setting the end position anywhere from 0 to 75 mm.
This SIJ model is discontinued; the direct replacement is the SAIJ40X75-75, matching the ISO 15552 interface, force, and adjust window. The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. The stop sets position but is not a load lock; use SAIL/BSAI for holding.
Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X75-75 Technical Specifications
| Model | Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X75-75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ40X75-75 |
| 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 SAIJ40X75-75 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 SAIJ40X75-75 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 SIJ40X75-75
| 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 SIJ40X75-75 Is Used
Variable Press Stroke
Allows operators to dial in the exact 0-75 mm extend contact distance for a light press operation without swapping cylinders.
Adjustable Diverter
Tunes the extend length of a routing gate on the fly to accommodate different package sizes on a single line.
Custom End Stops
Provides a field-adjustable mechanical end position for a tamping head, ensuring precise product depth control.
Replacing the Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X75-75 with the SAIJ40X75-75
To replace the discontinued SIJ40X75-75, order the direct replacement SAIJ40X75-75, reusing your FA, LB, or TC mounts. The 75 mm adjust window allows maximum extend flexibility. This non-magnetic SKU cannot take a switch; add -S for legacy CS1-B/DS1-B sensing. Stroke is under 300 mm, so side-load wear is minimal. The stop screw sets end position, not a lock—add an external rod lock for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ40X75-75
- ✓ 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 SIJ40X75-75 FAQ
Yes, the SIJ40X75-75 is discontinued.
The external stop screw window is 75 mm, allowing you to trim the extend stroke by up to 75 mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ40X75-75
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ40X75-75 replacement — usually within 7-8 hours.