This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X75FTC, 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 SI50X75FTC
The AirTAC SI50 Standard Cylinder SI50X75FTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X75FTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X75FTC
- 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 SI50X75FTC
The AirTAC SI50X75FTC is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel and adjustable air cushions. It delivers 982 N push and 825 N pull at 0.5 MPa via a G1/4 port. Because this legacy unit is end-of-life, order the direct replacement: SAI50X75FTC. It shares the same 50 mm bore, 75 mm stroke, M16x1.5 rod thread, output force and FTC trunnion mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. This specific SKU lacks the -S magnet, meaning it cannot accept CS1-B or DS1-B sensors. For elevated heat, Viton H seals raise the operating range to 0-150 C.
Airtac SI50 Standard Cylinder SI50X75FTC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X75FTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X75FTC |
| Bore size | Ø50 mm |
| Stroke | 75 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 SAI50X75FTC 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 SAI50X75FTC 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 SI50X75FTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SI50X75FTC Is Used
Package Diverting
Ideal for actuating lightweight diverter arms on packaging lines where the 982 N push force easily overcomes friction at 0.5 MPa.
Pallet Stop Gate
Uses the FTC trunnion mount to pivot a stop gate for roller conveyors, handling loads safely within the 50 kg vertical lift limit.
Clamp Actuation
Provides reliable clamping pressure for medium-duty machining fixtures, benefiting from the 30 mm adjustable air cushions at stroke ends.
Replacing the Airtac SI50 Standard Cylinder SI50X75FTC with the SAI50X75FTC
To replace the SI50X75FTC, order the SAI50X75FTC. Confirm the ISO 15552 FTC trunnion mount, 50 mm bore, 75 mm stroke, G1/4 port (PT/G/NPT thread options) and M16x1.5 rod. Since this SKU has no -S magnet, it cannot support position sensing; if switches are needed, select an SAI50X75SFTC. Sizing both ways: a 40 mm bore yields 628 N push at 0.5 MPa, while a 63 mm bore yields 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL (air-released lock) and BSAI (clamp-lock) variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X75FTC
- ✓ 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 SI50X75FTC FAQ
Yes, the SI50X75FTC is discontinued. The direct replacement is the SAI50X75FTC. It is dimensionally interchangeable per ISO 15552, retaining the same FTC trunnion mount, 50 mm bore, 75 mm stroke, G1/4 port and output force.
The bore is 50 mm with a G1/4 air port. Force output is 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 SAI50X75FTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X75FTC replacement — usually within 7-8 hours.