This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX180, 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 SI40BX180
The AirTAC Airtac SI40 Standard Cylinder SI40BX180 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 SAI40BX180, 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 → SAI40BX180
- 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 SI40BX180
The AirTAC SI40BX180 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 SAI40BX180, matching the interface, force, and mounting exactly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40BX180 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX180 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX180 |
| 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 SAI40BX180 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 SAI40BX180 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 SI40BX180
| 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 SI40BX180 Is Used
Washdown Conveyors
The SUS304 stainless rod resists moisture, making it ideal for pushing diverters on food-grade or washed material handling lines.
Light Pressing
Provides 628N of push force at 0.5MPa for seating bearings or light assembly presses within a 180mm travel.
Replacing the Airtac SI40 Standard Cylinder SI40BX180 with the SAI40BX180
To replace the SI40BX180, order the SAI40BX180. Confirm the ISO 15552 mounting interface, 40mm bore, 180mm stroke, G1/4 port (PT/G/NPT thread), and mounting accessory. This unit uses a SUS304 stainless rod for corrosion resistance. Because it lacks the -S magnet, it cannot support position sensing; order an -S variant if switches are needed. If sizing up or down, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX180
- ✓ 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 SI40BX180 FAQ
Yes, the SI40BX180 is discontinued. The direct replacement is the SAI40BX180. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 180mm stroke, G1/4 port, and mounting fixtures.
This double-acting cylinder uses a G1/4 port. At 0.5MPa it provides 628N push and 528N pull force. At 0.7MPa the push force is 879N, and at 0.9MPa it is 1130N. The theoretical maximum force is 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX180
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX180 replacement — usually within 7-8 hours.