This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X80SFA, 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 SI40X80SFA
The AirTAC Airtac SI40 Standard Cylinder SI40X80SFA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X80SFA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X80SFA
- 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 SI40X80SFA
The AirTAC SI40X80SFA is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 80mm stroke, and FA flange mount. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40X80SFA. This direct upgrade shares the exact ISO 15552 mounting interface, bore, and output force for existing fixtures.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI lock variants absent in the SI line. The -S magnet works with CS1-B/DS1-B switches, while the SAI uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40X80SFA Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X80SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X80SFA |
| Bore size | Ø40 mm |
| Stroke | 80 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 SAI40X80SFA 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 SAI40X80SFA 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 SI40X80SFA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 SI40X80SFA Is Used
Clamping Actuators
Secures mid-weight workpieces in machining centers with 628N push force, utilizing the FA flange for rigid body-mounting to the tooling base.
Package Diverters
Drives 80mm stroke sorting gates along packaging lines, moving light to medium cartons reliably at speeds between 30-800 mm/s.
Replacing the Airtac SI40 Standard Cylinder SI40X80SFA with the SAI40X80SFA
To replace the SI40X80SFA, order the SAI40X80SFA. Verify the ISO 15552 FA flange interface, 80mm stroke, G1/4 port, and M12x1.25 rod thread. The -S magnet enables CS1-B/DS1-B sensors; the SAI uses current switches. Sizing both ways: a 32mm bore yields 402N at 0.5MPa, while a 50mm bore yields 982N. 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 variant. The 80mm stroke avoids rod-bending side-load risks seen in longer strokes.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X80SFA
- ✓ 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 SI40X80SFA FAQ
Yes, the SI40X80SFA is discontinued. The direct replacement is the SAI40X80SFA. It shares the identical ISO 15552 mounting interface, 40mm bore, 80mm stroke, G1/4 port, and FA flange, fitting existing fixtures perfectly without modifications.
The 40mm bore features a G1/4 air port and M12x1.25 rod thread. It generates 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N at 0.9MPa, and a theoretical max of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X80SFA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X80SFA replacement — usually within 7-8 hours.