This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X75SFTC, 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 SI50X75SFTC
The AirTAC Airtac SI50 Standard Cylinder SI50X75SFTC 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 SAI50X75SFTC, 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 → SAI50X75SFTC
- 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 SI50X75SFTC
The AirTAC SI50X75SFTC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 75mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X75SFTC, matching the bore, stroke, force, port, and FTC trunnion mount.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. The FTC mount and CS1-B/DS1-B sensors fit existing fixtures.
Airtac SI50 Standard Cylinder SI50X75SFTC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X75SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X75SFTC |
| 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 SAI50X75SFTC 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 SAI50X75SFTC 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 SI50X75SFTC
| 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 SI50X75SFTC Is Used
Component Clamping
Secures mid-weight machined parts during milling with 982N of thrust at 0.5MPa.
Package Diverting
Short 75mm stroke actuates routing gates smoothly on high-speed packaging lines.
Pallet Stops
Controls pallet movement on rollers using the FTC trunnion mount for stable pivoting.
Replacing the Airtac SI50 Standard Cylinder SI50X75SFTC with the SAI50X75SFTC
To replace the SI50X75SFTC, order the SAI50X75SFTC. It is dimensionally interchangeable per the ISO 15552 mounting interface, keeping the 50mm bore, 75mm stroke, G1/4 port, and FTC trunnion accessory. Retain the -S magnet for current AirTAC switches (legacy CS1-B/DS1-B). If sizing up, the 63mm bore yields 1559N at 0.5MPa; if sizing down, the 40mm bore yields 628N. A plain cylinder drifts on air loss as the cushion only decelerates; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X75SFTC
- ✓ 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 SI50X75SFTC FAQ
Yes, the SI50X75SFTC is discontinued. The direct replacement is the SAI50X75SFTC. It shares the identical ISO 15552 mounting interface, 50mm bore, 75mm stroke, G1/4 port, and FTC trunnion mount, fitting existing fixtures perfectly.
The bore is 50mm with a G1/4 air port. Force output is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa. It operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X75SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X75SFTC replacement — usually within 7-8 hours.