This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX760S, 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 SI40BX760S
The AirTAC Airtac SI40 Standard Cylinder SI40BX760S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 760mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX760S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke760 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX760S
- 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 SI40BX760S
The AirTAC SI40BX760S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 760mm stroke. Featuring a SUS304 stainless piston rod, it delivers 628 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40BX760S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Because the -S magnet is present, it supports legacy CS1-B/DS1-B sensors, while the SAI family uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40BX760S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX760S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX760S |
| Bore size | Ø40 mm |
| Stroke | 760 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 SAI40BX760S 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 SAI40BX760S 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 SI40BX760S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×760 | 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 SI40BX760S Is Used
Long-Stroke Diversion
Drives sorting gates on packaging lines where the 760mm stroke shifts products between adjacent conveyor belts.
Stainless Rod Washdown
Actuates doors or flaps in humid washdown zones, leveraging the SUS304 rod for corrosion resistance.
32 kg Vertical Lowering
Lowers light fixtures or pallets up to 32 kg, using adjustable air cushions to decelerate the load at stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40BX760S with the SAI40BX760S
To replace the SI40BX760S, order the SAI40BX760S. Confirm the ISO 15552 mounting interface, the 40mm bore, the 760mm stroke, the G1/4 port, and your specific mounting accessory. The -B rod option provides the SUS304 stainless steel rod, and the -S suffix means a magnet is built in for CS1-B/DS1-B switches. If you need more force, the neighbouring 50mm bore yields 982 N push at 0.5 MPa; if less force is acceptable, the 32mm bore provides 402 N. Note that a 760mm stroke requires external guides to prevent rod bending and side-load damage. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX760S
- ✓ 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 SI40BX760S FAQ
Yes, the SI40BX760S is discontinued. The direct replacement is the SAI40BX760S. It shares the same ISO 15552 mounting interface, 40mm bore, 760mm stroke, G1/4 port, and output force, fitting directly into existing fixtures.
This double-acting cylinder uses a G1/4 air port. It delivers 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX760S
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