This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X620S, 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 SI40X620S
The AirTAC Airtac SI40 Standard Cylinder SI40X620S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 620mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X620S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke620 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X620S
- 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 SI40X620S
The AirTAC SI40X620S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 620 mm stroke. Delivering 628 N push at 0.5 MPa, it is replaced by the SAI40X620S. This direct upgrade shares the exact ISO 15552 mounting interface, G1/4 port, and force ratings. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
The SAI family also introduces lock and self-valve variants (SAIL, SAIF, BSAI) absent in the SI line. Your -S magnet designation supports legacy CS1-B/DS1-B sensors, while the SAI replacement uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40X620S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X620S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X620S |
| Bore size | Ø40 mm |
| Stroke | 620 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 SAI40X620S 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 SAI40X620S 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 SI40X620S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×620 | 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 SI40X620S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the 620 mm extension, relying on the 628 N thrust at 0.5 MPa to overcome friction.
Pallet Stopper Gate
Acts as a high-cycle pneumatic stop for pallets, taking advantage of the adjustable 27 mm air cushions at both ends to absorb impact.
Replacing the Airtac SI40 Standard Cylinder SI40X620S with the SAI40X620S
To replace the SI40X620S, order the SAI40X620S, confirming the ISO 15552 mounting interface, 620 mm stroke, and G1/4 port (PT/G/NPT). Retain your existing mounting accessories and -S magnet requirement. When sizing, note the 40 mm bore yields 628 N push at 0.5 MPa; dropping to a 32 mm bore gives 402 N, while a 50 mm bore provides 982 N. Because this is a 620 mm stroke, prevent rod bending by guiding the load externally to avoid side-load forces. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X620S
- ✓ 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 SI40X620S FAQ
Yes, the SI40X620S is discontinued. The direct replacement is the SAI40X620S. It shares the same ISO 15552 mounting interface, 40 mm bore, 620 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The 40 mm bore features a G1/4 air port and a 16 mm rod. It delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, and 1130 N push at 0.9 MPa. The theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X620S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X620S replacement — usually within 7-8 hours.