This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X80SN, 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 SI40X80SN
The AirTAC Airtac SI40 Standard Cylinder SI40X80SN 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 SAI40X80SN, 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 → SAI40X80SN
- 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 SI40X80SN
The AirTAC SI40X80SN is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke and 40 mm bore. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this unit with the SAI40X80SN, a direct sharing the same mounting interface, bore, stroke, output force, and port size.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, while the -N NBR seal handles -20 to +70 C (Viton H raises this to 150 C).
Airtac SI40 Standard Cylinder SI40X80SN Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X80SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X80SN |
| 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 SAI40X80SN 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 SAI40X80SN 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 SI40X80SN
| 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 SI40X80SN Is Used
Component Clamping
Secures mid-weight machined parts during milling or drilling, utilizing the 628 N push force at 0.5 MPa for rigid workholding.
Package Diverting
Actuates 80 mm stroke diverting arms on packaging lines to route boxes, benefiting from the 30-800 mm/s speed range.
Pallet Stops
Functions as a pneumatic stop gate in material handling zones, raising and lowering to control pallet flow safely.
Replacing the Airtac SI40 Standard Cylinder SI40X80SN with the SAI40X80SN
To replace the SI40X80SN, order the SAI40X80SN. Confirm the ISO 15552 mounting interface, 40 mm bore, 80 mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. The SAI family adds SAIL, SAIF, and BSAI variants the SI lacked. For sizing, a 32 mm bore gives 402 N push at 0.5 MPa, while a 50 mm bore gives 982 N. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X80SN
- ✓ 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 SI40X80SN FAQ
Yes, the SI40X80SN is discontinued. The direct replacement is the SAI40X80SN. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 80 mm stroke, 628 N force, and G1/4 port for existing fixtures.
The 40 mm bore features a G1/4 air port. At 0.5 MPa it provides 628 N push and 528 N pull force. At 0.7 MPa it pushes 879 N, and 1130 N at 0.9 MPa. The theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X80SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X80SN replacement — usually within 7-8 hours.