This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ40X75-20, 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 SIJ40X75-20
The AirTAC SIJ40 Double Shaft Adjustable Cylinder SIJ40X75-20 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 SAIJ40X75-20, 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 → SAIJ40X75-20
- 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 SIJ40X75-20
The AirTAC SIJ40X75-20 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 20 mm on-site, yielding a usable 55-75 mm extension out of the 75 mm nominal maximum. The direct replacement is the SAIJ40X75-20, matching the interface, force, and mounting.
The SAIJ successor retains the ratings but adds an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Remember the stop screw sets end position only; it is not a lock, and this non-magnetic SKU cannot take a switch.
Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X75-20 Technical Specifications
| Model | Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X75-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ40X75-20 |
| 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 SAIJ40X75-20 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 SAIJ40X75-20 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 SIJ40X75-20
| 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 SIJ40X75-20 Is Used
Diverter Gate Positioning
Allows field tuning of the extend stroke by up to 20 mm to perfectly set a diverter flap without swapping cylinders.
Package Stopper Height
Adjusts the extend end position on-site to accommodate varying carton heights on a packaging conveyor line.
Clamping Force Setup
Trims the extend stroke to dial in the exact clamping reach for delicate workpieces during machining fixtures.
Replacing the Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X75-20 with the SAIJ40X75-20
To replace the discontinued SIJ40X75-20, order the direct replacement SAIJ40X75-20, reusing your FA, LB, or TC mounts. Size both ways using 0.5 MPa push force: the 32 mm bore yields 402 N, while the 50 mm bore yields 982 N, compared to this 40 mm bore's 628 N. Choose the 20 mm adjust window when you need on-site extend trimming between 55 and 75 mm. Because this SKU lacks the -S magnet, it cannot accept legacy CS1-B/DS1-B sensors; add external sensing if required. For strokes at or above 300 mm, verify your side-load limits to prevent guide wear. Note the stop screw is not a load lock; for held loads use an external rod lock or SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ40X75-20
- ✓ 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 SIJ40X75-20 FAQ
Yes, the SIJ40X75-20 is discontinued. The direct replacement is the SAIJ40X75-20, which shares the same ISO 15552 interface, 75 mm stroke, 20 mm adjust window, and G1/4 port.
The external stop screw provides a 20 mm adjust window, shortening the extend stroke from 75 mm down to 55 mm. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ40X75-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ40X75-20 replacement — usually within 7-8 hours.