This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX180S, 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 SI40BX180S
The AirTAC Airtac SI40 Standard Cylinder SI40BX180S 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 SAI40BX180S, 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 → SAI40BX180S
- 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 SI40BX180S
The AirTAC SI40BX180S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 180mm stroke. Featuring a SUS304 stainless piston rod, it delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40BX180S, matching the bore, stroke, force, and ISO 15552 mounting interface for seamless fixture integration.
The SAI upgrade introduces an advanced two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line. This -S model includes a magnet for CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40BX180S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX180S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX180S |
| 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 SAI40BX180S 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 SAI40BX180S 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 SI40BX180S
| 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 SI40BX180S Is Used
Diverting Gate Actuation
Drives lightweight routing flaps on packaging lines, using the 628N push force and 180mm stroke to redirect cartons efficiently.
Stainless Rod Clamping
Secures machined components in humid washdown cells, leveraging the SUS304 rod for corrosion resistance during repetitive clamping.
Replacing the Airtac SI40 Standard Cylinder SI40BX180S with the SAI40BX180S
To replace the SI40BX180S, order the SAI40BX180S. Verify the ISO 15552 mounting interface, 40mm bore, 180mm stroke, G1/4 port, and the -S magnet for current AirTAC switches. The -B rod specifies SUS304 stainless steel for corrosion resistance. For sizing both ways: a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. Note that a plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. For this 180mm stroke, ensure guide alignment to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX180S
- ✓ 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 SI40BX180S FAQ
Yes, the SI40BX180S is discontinued. The direct replacement is the SAI40BX180S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 180mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder features a G1/4 air port. The force output is 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX180S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX180S replacement — usually within 7-8 hours.