This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X300SFA, 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 SI50X300SFA
The AirTAC Airtac SI50 Standard Cylinder SI50X300SFA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X300SFA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X300SFA
- 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 SI50X300SFA
The AirTAC SI50X300SFA is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 300mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced this unit with the SAI50X300SFA, a direct upgrade retaining the same interface, force, and mounting.
The SAI upgrade features a new piston seal with two Y-shaped elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI50 Standard Cylinder SI50X300SFA Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X300SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X300SFA |
| Bore size | Ø50 mm |
| Stroke | 300 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 SAI50X300SFA 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 SAI50X300SFA 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 SI50X300SFA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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 SI50X300SFA Is Used
Material Diversion
Actuates routing gates on packaging lines, utilizing the 982N push force to reliably shift heavy product flows at speed.
Pallet Handling
Drives 300mm stroke stops and lifts within automated storage systems, requiring external guides to manage rod side-loads.
Replacing the Airtac SI50 Standard Cylinder SI50X300SFA with the SAI50X300SFA
To replace the SI50X300SFA, order the SAI50X300SFA. Verify the ISO 15552 FA flange mounting, 50mm bore, 300mm stroke, G1/4 port, and the -S magnet for CS1-B/DS1-B sensors. If you need more force, the neighboring 63mm bore yields 1559N push at 0.5MPa; if less is required, the 40mm bore gives 628N. Because this is a 300mm stroke, use an external guide to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or the SAIL/BSAI lock variant to hold loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X300SFA
- ✓ 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 SI50X300SFA FAQ
Yes, the SI50X300SFA is discontinued. The direct replacement is the SAI50X300SFA. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 300mm stroke, G1/4 port, FA flange, and magnet.
The 50mm bore features a G1/4 air port and M16x1.5 rod thread. It outputs 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X300SFA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X300SFA replacement — usually within 7-8 hours.