This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X82, 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 SI40X82
The AirTAC Airtac SI40 Standard Cylinder SI40X82 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 82mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X82, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke82 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X82
- 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 SI40X82
The AirTAC SI40X82 is a discontinued double-acting ISO 15552 profile cylinder with an 82 mm stroke and 40 mm bore, delivering 628 N push force at 0.5 MPa. AirTAC replaced this legacy unit with the SAI40X82 direct replacement. It shares the exact ISO 15552 mounting interface, G1/4 port, and M12x1.25 rod thread, fitting existing fixtures perfectly.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SKU lacks the -S magnet, so it cannot accept CS1-B/DS1-B sensors. For high heat, Viton H seals raise the limit to 150 C.
Airtac SI40 Standard Cylinder SI40X82 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X82 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X82 |
| Bore size | Ø40 mm |
| Stroke | 82 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 SAI40X82 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 SAI40X82 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 SI40X82
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×82 | 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 SI40X82 Is Used
Compact Part Ejection
Uses the 628 N push force at 0.5 MPa to eject small machined aluminium parts from a fixture without requiring a larger 50 mm bore.
Package Diverting
Executes an 82 mm stroke to push light cartons between conveyor lanes, operating reliably at speeds between 30 and 800 mm/s.
Replacing the Airtac SI40 Standard Cylinder SI40X82 with the SAI40X82
To replace the SI40X82, order the SAI40X82 and confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), 82 mm stroke, and G1/4 port (PT/G/NPT). Because this specific SKU has no -S magnet, it cannot hold a magnetic switch; order an -S variant if position sensing is required. When sizing, note the 628 N push force at 0.5 MPa lets you step down from a 50 mm bore if space is tight, or step up to a 50 mm bore for more thrust. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify the SAIL or BSAI lock variant. The 82 mm stroke is below the 300 mm threshold, so rod bending is minimal, but always guide the load to prevent side-loading.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X82
- ✓ 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 SI40X82 FAQ
Yes, the SI40X82 is discontinued. The direct replacement is the AirTAC SAI40X82. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 82 mm stroke, output force, G1/4 port, and mounting interface.
This double-acting cylinder has 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.
Request a Quote for the SAI40X82
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X82 replacement — usually within 7-8 hours.