This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X300FTC, 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 SI50X300FTC
The AirTAC Airtac SI50 Standard Cylinder SI50X300FTC 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 SAI50X300FTC, 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 → SAI50X300FTC
- 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 SI50X300FTC
The AirTAC SI50X300FTC is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore, 300 mm stroke, and FTC trunnion mount. Delivering 982 N push force at 0.5 MPa via a G1/4 port, it is replaced by the SAI50X300FTC. This direct successor matches the exact bore, stroke, force, port, and mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants the SI lacked. Note this SKU lacks a magnet and cannot take a sensor.
Airtac SI50 Standard Cylinder SI50X300FTC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X300FTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X300FTC |
| 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 SAI50X300FTC 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 SAI50X300FTC 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 SI50X300FTC
| 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 SI50X300FTC Is Used
Trunnion-Mounted Diverters
Ideal for pivoting conveyor diverters where the FTC trunnion mount allows controlled angular motion and the 982 N force handles standard package weights.
Vertical Lift Gates
Moves lightweight access gates or pallet stops; the 300 mm stroke provides ample travel, though an external check valve is needed to hold the load.
Long-Reach Ejection
Ejects machined parts from a fixture over a 300 mm distance, requiring external guide rails to prevent rod bending during the extended push cycle.
Replacing the Airtac SI50 Standard Cylinder SI50X300FTC with the SAI50X300FTC
To replace the SI50X300FTC, order the SAI50X300FTC. Confirm the ISO 15552 FTC trunnion mount, 50 mm bore, 300 mm stroke, G1/4 port (PT/G/NPT thread), and M16x1.5 rod. Since this SKU lacks -S, it cannot accept CS1-B/DS1-B sensors. If undersized, the 63 mm bore offers 1559 N; if oversized, the 40 mm gives 628 N. A plain cylinder drifts on air loss—use a pilot check valve or SAIL/BSAI lock for holding. For 300 mm strokes, use external guides to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X300FTC
- ✓ 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 SI50X300FTC FAQ
Yes, the AirTAC SI50X300FTC is discontinued. The direct replacement is the SAI50X300FTC. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 300 mm stroke, FTC mount, G1/4 port, and output force.
This double-acting cylinder has a G1/4 air port. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X300FTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X300FTC replacement — usually within 7-8 hours.