This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX800S, 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 SI40BX800S
The AirTAC Airtac SI40 Standard Cylinder SI40BX800S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 800mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX800S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX800S
- 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 SI40BX800S
The AirTAC SI40BX800S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 800mm stroke, G1/4 port, and a SUS304 stainless steel rod. Delivering 628 N push at 0.5 MPa, it is replaced by the SAI40BX800S. This direct successor matches the original bore, stroke, force, and ISO 15552 mounting interface exactly.
The SAI upgrade utilizes an advanced two-piece Y-shaped piston seal for lower start-up pressure and extended life. Because an 800 mm stroke invites rod bending, use external guides to prevent side loads. Note that plain cylinders drift without air; use a pilot check valve or the SAIL lock variant to hold loads.
Airtac SI40 Standard Cylinder SI40BX800S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX800S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX800S |
| Bore size | Ø40 mm |
| Stroke | 800 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 SAI40BX800S 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 SAI40BX800S 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 SI40BX800S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×800 | 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 SI40BX800S Is Used
Long-Stroke Diversion
Pushes packages across a 800mm transfer gap using the 628N force, relying on the SUS304 rod for corrosion resistance in washdown areas.
Pneumatic Stopper
Acts as an end-stop for moving pallets, where the adjustable 27mm cushion decelerates impacts, though a pilot check valve is needed to hold position.
Replacing the Airtac SI40 Standard Cylinder SI40BX800S with the SAI40BX800S
To replace the SI40BX800S, order the SAI40BX800S. Verify your ISO 15552 mounting fixtures (LB, FA, TC), the G1/4 air port, and the M12x1.25 rod thread. The -B rod is SUS304 stainless steel, and the -S magnet works with legacy CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). At 0.5 MPa, the 40mm bore yields 628 N push and 528 N pull; if undersized, the 50mm bore offers 982 N push. For the 800mm stroke, add external guides to prevent rod bending. The cushion only decelerates; it does not hold position. For secure load holding without air, specify the SAIL or BSAI lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX800S
- ✓ 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 SI40BX800S FAQ
Yes, the SI40BX800S is discontinued. The direct replacement is the SAI40BX800S. It shares the identical ISO 15552 mounting interface, 40mm bore, 800mm stroke, 628N force, and G1/4 port, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/4 port, M12x1.25 thread, and 27mm cushion. 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 maximum of 128 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX800S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX800S replacement — usually within 7-8 hours.