This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X320SH, 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 SI50 Standard Cylinder SI50X320SH
The AirTAC Airtac SI50 Standard Cylinder SI50X320SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 320mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X320SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke320 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X320SH
- 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 SI50 Standard Cylinder SI50X320SH
The AirTAC SI50X320SH is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 320mm stroke, and a high-temperature Viton H seal. Delivering 982 N push at 0.5 MPa, it is replaced by the direct replacement SAI50X320SH, which shares the exact interface, G1/4 port, and force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The SAI family adds SAIL, SAIF, and BSAI lock variants. This SI includes a magnet for CS1-B/DS1-B switches; the SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X320SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X320SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X320SH |
| Bore size | Ø50 mm |
| Stroke | 320 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X320SH carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50X320SH produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X320SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×320 | 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 SI50 Standard Cylinder SI50X320SH Is Used
Hot End Diverting
Pushes packages on high-temperature conveyors where the Viton H seal survives ambient heat while routing goods at 320mm stroke.
Vertical Lift Gate
Raises a 50kg access panel using the 982N push force at 0.5 MPa, requiring an external pilot check valve to prevent drifting on air loss.
Oven Door Actuation
Opens industrial oven doors at a 320mm reach, relying on the adjustable 30mm air cushions to decelerate the load smoothly at both ends.
Replacing the Airtac SI50 Standard Cylinder SI50X320SH with the SAI50X320SH
To replace the SI50X320SH, order the SAI50X320SH. Confirm the ISO 15552 mounting dimensions, G1/4 port, M16x1.5 rod thread, and the -S magnet. The -H Viton seal allows 0-150 C operation. For sizing both ways: a 40mm bore gives 628 N push, while a 63mm bore gives 1559 N at 0.5 MPa. At 320mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X320SH
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X320SH FAQ
Yes, the SI50X320SH is discontinued. The direct replacement is the SAI50X320SH. It is dimensionally interchangeable per ISO 15552, maintaining the same 50mm bore, 320mm stroke, G1/4 port, and mounting interface.
The G1/4 port bore 50mm cylinder delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N at 0.9 MPa, and a theoretical max of 200 kgf at 1.0 MPa. It operates at 30-800 mm/s with a 30mm adjustable cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X320SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X320SH replacement — usually within 7-8 hours.