This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX900S, 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 SI40BX900S
The AirTAC Airtac SI40 Standard Cylinder SI40BX900S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 900mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX900S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke900 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX900S
- 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 SI40BX900S
The AirTAC SI40BX900S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, delivering 628N push at 0.5 MPa. This version features a SUS304 stainless piston rod and a 900mm stroke. The direct replacement is the SAI40BX900S, retaining the same G1/4 port, M12x1.25 thread, and mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while SAI uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40BX900S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX900S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX900S |
| Bore size | Ø40 mm |
| Stroke | 900 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 SAI40BX900S 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 SAI40BX900S 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 SI40BX900S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×900 | 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 SI40BX900S Is Used
Long-Stroke Diversion
Actuates routing gates on packaging lines over a 900mm travel distance, utilizing the SUS304 rod for washdown corrosion resistance.
Vertical Material Lift
Raises lightweight totes up to 32kg using the 40mm bore, safely operating within the 628N push force at 0.5 MPa.
Pneumatic Press Ejection
Pushes finished parts out of a press area, relying on the adjustable 27mm air cushions to decelerate the load smoothly.
Replacing the Airtac SI40 Standard Cylinder SI40BX900S with the SAI40BX900S
To replace the SI40BX900S, order the SAI40BX900S to match the 40mm bore, 900mm stroke, SUS304 rod, and ISO 15552 mounting. Because this is a 900mm stroke, external guides are strongly recommended to prevent rod bending and excessive side loads. If you need more force, the 50mm bore offers 982N push at 0.5 MPa; if less is needed, the 32mm bore provides 402N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX900S
- ✓ 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 SI40BX900S FAQ
Yes, the SI40BX900S is discontinued. The direct replacement is the SAI40BX900S. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 900mm stroke, force, G1/4 port, and mounting fixtures.
This double-acting cylinder has a G1/4 air port. It generates 628N push and 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N push at 0.9 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX900S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX900S replacement — usually within 7-8 hours.