This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X320, 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 SI50X320
The AirTAC Airtac SI50 Standard Cylinder SI50X320 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 SAI50X320, 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 → SAI50X320
- 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 SI50X320
The AirTAC SI50X320 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 320mm stroke. It delivers 982N push and 825N pull at 0.5MPa through a G1/4 port. The direct replacement is the SAI50X320, matching the bore, stroke, force, port and ISO 15552 mounting interface exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. For sensing, note this specific SKU lacks a magnet (-S) and cannot take a CS1-B/DS1-B switch. If high heat is a factor, Viton H seals raise the limit to 150C.
Airtac SI50 Standard Cylinder SI50X320 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X320 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X320 |
| 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 SAI50X320 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 SAI50X320 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 SI50X320
| 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 SI50X320 Is Used
Package Diversion
Pushes packages at 30-800 mm/s on sorting lines, using the 320mm stroke to clear adjacent lanes.
Pallet Handling
Indexes empty pallets into position with 982N push force at 0.5 MPa for automated wrapping.
Light Pressing
Applies downward clamping pressure for component seating, relying on adjustable cushions at stroke end.
Replacing the Airtac SI50 Standard Cylinder SI50X320 with the SAI50X320
To replace the SI50X320, order the SAI50X320. Verify the ISO 15552 mounting interface, the G1/4 port, the M16x1.5 rod thread, and your specific mounting accessory (LB, FA, TC, etc.). Because this SKU lacks the -S magnet, it cannot accept position sensors; order the -S variant if switches are needed. Sizing both ways: the 50mm bore gives 1374N at 0.7MPa, while a neighbouring 63mm bore offers 1559N at 0.5MPa. For the 320mm stroke, use external guides to prevent rod bending and side-load wear. The air cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X320
- ✓ 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 SI50X320 FAQ
Yes, the SI50X320 is discontinued. The direct replacement is the SAI50X320, a true ISO 15552 profile cylinder that matches the 50mm bore, 320mm stroke, 982N force, G1/4 port and mounting interface.
It uses a G1/4 port. Theoretical forces are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, and a maximum of 200kgf at 1.0MPa.
Request a Quote for the SAI50X320
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X320 replacement — usually within 7-8 hours.