This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX65S, 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 SI40BX65S
The AirTAC Airtac SI40 Standard Cylinder SI40BX65S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 65mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX65S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke65 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX65S
- 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 SI40BX65S
The AirTAC SI40BX65S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 65mm stroke, and a SUS304 stainless steel rod. It delivers 628 N push force at 0.5 MPa. The direct replacement is the SAI40BX65S, which maintains the same interface, port, and force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. Note the G1/4 port and M12x1.25 thread. The original -S magnet supports CS1-B/DS1-B sensors, while SAI uses current switches.
Airtac SI40 Standard Cylinder SI40BX65S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX65S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX65S |
| Bore size | Ø40 mm |
| Stroke | 65 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 SAI40BX65S 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 SAI40BX65S 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 SI40BX65S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×65 | 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 SI40BX65S Is Used
Stainless Rod Clamping
Ideal for packaging lines requiring washdown resistance, using the SUS304 rod to secure components with 628 N of push force.
Short Stroke Diversion
The 65mm stroke provides compact actuation for diverting small to medium products between conveyor lanes.
Replacing the Airtac SI40 Standard Cylinder SI40BX65S with the SAI40BX65S
To replace the SI40BX65S, order the SAI40BX65S. Confirm the ISO 15552 mounting interface, the 65mm stroke, G1/4 port, and the -S magnet. The -B rod is SUS304 stainless steel. If you need more force, the 50mm bore yields 982 N push at 0.5 MPa; if less is acceptable, the 32mm bore gives 402 N. Remember, a plain cylinder drifts without live air, so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant adds a built-in valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX65S
- ✓ 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 SI40BX65S FAQ
Yes, the SI40BX65S is discontinued. The direct replacement is the SAI40BX65S. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 65mm stroke, force, and G1/4 port.
The SI40BX65S provides 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 max of 128 kgf at 1.0 MPa. The operating speed range is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX65S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX65S replacement — usually within 7-8 hours.