This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX110S, 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 SI40BX110S
The AirTAC Airtac SI40 Standard Cylinder SI40BX110S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 110mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX110S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke110 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX110S
- 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 SI40BX110S
The AirTAC SI40BX110S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 110mm stroke, and a SUS304 stainless steel piston rod. Delivering 628 N push force at 0.5 MPa, it is replaced by the SAI40BX110S. This direct upgrade matches the exact G1/4 port, M12x1.25 thread, and ISO 15552 mounting interface.
The SAI successor introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40BX110S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX110S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX110S |
| Bore size | Ø40 mm |
| Stroke | 110 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 SAI40BX110S 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 SAI40BX110S 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 SI40BX110S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×110 | 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 SI40BX110S Is Used
Stainless Rod Diverter
Ideal for pushing lightweight packages on a washdown conveyor line, utilizing the 110mm stroke and SUS304 rod for damp environment reliability.
Pneumatic Clamping Arm
Actuates mid-force clamping arms on automated test fixtures, taking advantage of the 27mm adjustable air cushions at both ends for smooth stops.
Replacing the Airtac SI40 Standard Cylinder SI40BX110S with the SAI40BX110S
To replace the SI40BX110S, order the SAI40BX110S. Confirm the ISO 15552 mounting interface, 40mm bore, 110mm stroke, G1/4 port, and your specific mounting accessory (LB, FA, TC, etc.). The -B rod material denotes SUS304 stainless steel for corrosion resistance, and the -S suffix confirms the piston magnet for switch sensing. If you need to size up or down, the adjacent 32mm bore yields 402 N push at 0.5 MPa, while the 50mm bore yields 982 N. Note that a plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX110S
- ✓ 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 SI40BX110S FAQ
Yes, the SI40BX110S is discontinued. The direct replacement is the SAI40BX110S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 110mm stroke, 628 N force, G1/4 port, and mounting interface. The SAI features an upgraded two Y-shaped element piston seal for longer life.
The bore is 40mm with a G1/4 air port and a 16mm piston rod. Force ratings 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 theoretical maximum of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX110S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX110S replacement — usually within 7-8 hours.