This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X180, 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 SI40X180
The AirTAC Airtac SI40 Standard Cylinder SI40X180 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 180mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X180, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke180 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X180
- 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 SI40X180
The AirTAC SI40X180 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 180 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40X180, matching the interface, bore, stroke, force and mounting exactly.
This SKU lacks a magnet and cannot accept a sensor. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. For high heat, Viton H seals raise the temperature limit to 150 C.
Airtac SI40 Standard Cylinder SI40X180 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X180 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X180 |
| Bore size | Ø40 mm |
| Stroke | 180 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 SAI40X180 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 SAI40X180 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 SI40X180
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×180 | 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 SI40X180 Is Used
Clamp Actuation
Provides 628 N of push force at 0.5 MPa to secure medium aluminium housings during CNC milling.
Stopper Cylinder
Functions as a pneumatic stop in manual assembly lines, holding workpieces steady at 180 mm extension.
Replacing the Airtac SI40 Standard Cylinder SI40X180 with the SAI40X180
To replace the SI40X180, order the SAI40X180. Confirm the ISO 15552 mounting interface, the 40 mm bore, 180 mm stroke, G1/4 port (PT/G/NPT thread options) and your mounting accessory. Because this specific SKU has no -S magnet, it cannot support position sensing; if you need switches, order the SAI40X180S and use current AirTAC sensors. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or choose the SAIL or BSAI lock variant. If sizing up or down, adjacent bores are 32 mm (402 N push @0.5 MPa) and 50 mm (982 N push @0.5 MPa).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X180
- ✓ 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 SI40X180 FAQ
Yes, the AirTAC SI40X180 is discontinued. The direct replacement is the SAI40X180. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 180 mm stroke, output force, G1/4 port and mounting fixtures.
The 40 mm bore features a 16 mm rod, M12x1.25 thread, 27 mm cushion and G1/4 port. Forces are 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, and a max of 128 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Request a Quote for the SAI40X180
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X180 replacement — usually within 7-8 hours.