This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X50SFTC, 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 SI50X50SFTC
The AirTAC Airtac SI50 Standard Cylinder SI50X50SFTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X50SFTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X50SFTC
- 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 SI50X50SFTC
The AirTAC SI50X50SFTC is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 50mm stroke, G1/4 port, and an FTC trunnion mount. Delivering 982 N push force at 0.5 MPa, it is replaced by the SAI50X50SFTC. This direct successor matches the exact ISO 15552 mounting interface, output, and dimensions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For holding loads, the plain SI drifts without air; the SAIL or BSAI lock variants solve this. The -S magnet pairs with CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50X50SFTC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X50SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X50SFTC |
| Bore size | Ø50 mm |
| Stroke | 50 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 SAI50X50SFTC 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 SAI50X50SFTC 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 SI50X50SFTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×50 | 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 SI50X50SFTC Is Used
Component Clamping
Ideal for mid-force clamping on machining fixtures, utilizing the 982 N push force at 0.5 MPa to secure parts firmly during secondary operations.
Package Diverting
Provides reliable actuation for sorting gates and diverters on packaging lines, where the 50mm stroke and FTC trunnion mount deliver precise lateral movement.
Replacing the Airtac SI50 Standard Cylinder SI50X50SFTC with the SAI50X50SFTC
To replace the SI50X50SFTC, order the SAI50X50SFTC. Verify the ISO 15552 FTC trunnion interface, 50mm stroke, G1/4 port, and the -S magnet for CS1-B/DS1-B sensors. If downsizing, the 40mm bore yields 628 N push at 0.5 MPa; if upsizing, the 63mm bore provides 1559 N. Remember, a standard cylinder drifts without live air—the cushion only decelerates. For secure load holding, use an external pilot check valve or the SAIL/BSAI lock variants. Rod material options include carbon steel, SUS420J2, or SUS304.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X50SFTC
- ✓ 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 SI50X50SFTC FAQ
Yes, the SI50X50SFTC is discontinued. The direct replacement is the AirTAC SAI50X50SFTC. It shares the identical ISO 15552 mounting interface, 50mm bore, 50mm stroke, G1/4 port, and FTC trunnion mount, fitting directly into existing fixtures.
The bore is 50mm with a G1/4 air port. Thrust is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and 1767 N push at 0.9 MPa. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X50SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X50SFTC replacement — usually within 7-8 hours.