This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X750SFB, 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 SI40X750SFB
The AirTAC Airtac SI40 Standard Cylinder SI40X750SFB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 750mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X750SFB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke750 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X750SFB
- 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 SI40X750SFB
The AirTAC SI40X750SFB is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 750mm stroke, and an FB flange mount. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40X750SFB. This direct upgrade retains the exact ISO 15552 mounting dimensions, bore, and stroke.
The SAI successor improves longevity with two Y-shaped one-way piston seals for low start-up pressure. The SAI family also introduces SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40X750SFB Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X750SFB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X750SFB |
| Bore size | Ø40 mm |
| Stroke | 750 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 SAI40X750SFB 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 SAI40X750SFB 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 SI40X750SFB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×750 | 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 SI40X750SFB Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with a 750mm reach, utilizing the FB flange to withstand lateral shifting during transit.
Vertical Material Lift
Raises lightweight totes up to 32kg in pick modules, relying on the 628N @0.5MPa thrust to elevate goods smoothly.
Component Ejection
Clears molded parts from press beds over a wide 750mm span, where the adjustable 27mm cushion decelerates the rod at stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40X750SFB with the SAI40X750SFB
To replace the SI40X750SFB, order the SAI40X750SFB. Verify the ISO 15552 interface, 40mm bore, 750mm stroke, G1/4 port (PT/G/NPT thread options), FB flange mount, and the -S magnet for CS1-B/DS1-B sensors. When sizing, neighboring bores offer different forces: a 32mm bore yields 402N push @0.5MPa, while a 50mm bore yields 982N @0.5MPa. For this 750mm stroke, use external guides to prevent rod bending and side-load wear. The air cushion only decelerates; it does not hold load. For dead-load holding, use an external pilot check valve or the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X750SFB
- ✓ 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 SI40X750SFB FAQ
Yes, the SI40X750SFB is discontinued. The direct replacement is the SAI40X750SFB. It shares the same ISO 15552 mounting interface, 40mm bore, 750mm stroke, G1/4 port, and FB flange, fitting existing fixtures perfectly.
This 40mm bore cylinder uses a G1/4 air port. It delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X750SFB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X750SFB replacement — usually within 7-8 hours.