This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X65, 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 SI40X65
The AirTAC SI40 Standard Cylinder SI40X65 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 SAI40X65, 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 → SAI40X65
- 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 SI40X65
The AirTAC SI40X65 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 65mm stroke, delivering 628 N push force at 0.5 MPa through its G1/4 port. AirTAC replaced this legacy unit with the SAI40X65. This current-production direct maintains the exact ISO 15552 mounting interface, bore, stroke, output force, and port size, fitting existing fixtures perfectly.
The SAI upgrade features a revised piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. Because this specific SI40X65 SKU lacks the -S magnet suffix, it cannot accept a position sensor.
Airtac SI40 Standard Cylinder SI40X65 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X65 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X65 |
| 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 SAI40X65 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 SAI40X65 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 SI40X65
| 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 SI40X65 Is Used
Clamp Actuation
Ideal for mid-force 628 N clamping of machined parts in CNC fixtures, utilizing the 65mm stroke for rapid open-close cycles.
Package Diversion
Drives short-stroke sorting gates on packaging lines, providing reliable 65mm movement to redirect boxes at high speeds.
Stopper Cylinder
Functions as a pneumatic stop in material handling conveyors, holding loads safely within its 377 N working limit.
Replacing the Airtac SI40 Standard Cylinder SI40X65 with the SAI40X65
To replace the SI40X65, order the SAI40X65. Verify your ISO 15552 mounting accessory (LB foot, FA flange, TC trunnion) and confirm the G1/4 port thread (PT, G, or NPT). Since this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is required, specify an SAI40X65S. For load holding, note that a standard cylinder drifts on air loss—the cushion only decelerates near stroke ends. Use an external pilot check valve or explore the SAIL (air-released lock) or BSAI (clamp-lock) variants. If downsizing, the 32mm bore yields 402 N push at 0.5 MPa; if upsizing, the 50mm bore provides 982 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X65
- ✓ 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 SI40X65 FAQ
Yes, the AirTAC SI40X65 is discontinued. The direct replacement is the SAI40X65. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 65mm stroke, 628 N force, G1/4 port, and mounting interface.
The 40mm bore uses a G1/4 air port. Force outputs are: 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.
Request a Quote for the SAI40X65
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X65 replacement — usually within 7-8 hours.