This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX70, 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 SI40 Standard Cylinder SI40AX70
The AirTAC Airtac SI40 Standard Cylinder SI40AX70 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 70mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX70, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke70 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX70
- 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 SI40 Standard Cylinder SI40AX70
The AirTAC SI40AX70 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 70mm stroke. It delivers 628 N push and 528 N pull at 0.5 MPa via a G1/4 port. The direct replacement is the SAI40AX70, matching the interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants the SI lacked. This SKU has a SUS420J2 stainless rod (-A) but no magnet, so it cannot take a sensor.
Airtac SI40 Standard Cylinder SI40AX70 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX70 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX70 |
| Bore size | Ø40 mm |
| Stroke | 70 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 SAI40AX70 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 SAI40AX70 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40AX70
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×70 | 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 SI40 Standard Cylinder SI40AX70 Is Used
Medium-Force Clamping
Ideal for holding aluminum or mild-steel workpieces during CNC milling, delivering a reliable 628 N of clamping force at 0.5 MPa.
Package Diverting
Provides robust 70mm actuation to push medium-weight cartons off a main production line onto secondary packaging tracks.
Stainless Rod Ejection
The SUS420J2 stainless rod option excels in mildly humid environments for ejecting formed parts from automated machinery.
Replacing the Airtac SI40 Standard Cylinder SI40AX70 with the SAI40AX70
To replace this SI40AX70, order the SAI40AX70. Confirm the ISO 15552 mounting interface, 40mm bore, 70mm stroke, G1/4 port, and SUS420J2 rod. Since this SKU lacks a magnet (-S), it cannot accept CS1-B/DS1-B sensors. For sizing, the 32mm bore yields 402 N [email protected], while the 50mm bore yields 982 N. Note that a plain cylinder drifts on air loss; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX70
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40AX70 FAQ
Yes, the AirTAC SI40AX70 is discontinued. The direct replacement is the SAI40AX70. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 70mm stroke, 628 N force, G1/4 port, and mounting fixtures.
The bore is 40mm with a G1/4 air port. Theoretical forces are: 628 N push and 528 N pull at 0.5 MPa; 879 N push at 0.7 MPa; 1130 N push at 0.9 MPa; and a maximum force of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40AX70
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX70 replacement — usually within 7-8 hours.