This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1000FA, 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 SI50X1000FA
The AirTAC Airtac SI50 Standard Cylinder SI50X1000FA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1000mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1000FA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1000 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1000FA
- 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 SI50X1000FA
The AirTAC SI50X1000FA is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 1000 mm stroke. Delivering 982 N of push force at 0.5 MPa, it uses a G1/4 air port and an FA flange mounting interface. AirTAC replaced this legacy unit with the SAI50X1000FA, a direct replacement retaining the exact same ISO 15552 mounting dimensions, bore, stroke, force, and port size.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Because this specific SKU lacks the -S magnet, it cannot accept a position sensor. The SAI family also introduces lock and valve variants (SAIL, BSAI, SAIF) absent in the original SI line.
Airtac SI50 Standard Cylinder SI50X1000FA Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1000FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1000FA |
| Bore size | Ø50 mm |
| Stroke | 1000 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 SAI50X1000FA 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 SAI50X1000FA 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 SI50X1000FA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1000 | 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 SI50X1000FA Is Used
Long-Stroke Material Transfer
Pushes workpieces between processing stations over a 1000 mm span, utilizing the 982 N thrust at 0.5 MPa to move moderate loads smoothly.
Pallet Push-Off Station
Actuates a pusher arm to index packaged goods onto a discharge roller bed, relying on the FA flange mount to stabilize the extended 50 mm bore body.
Replacing the Airtac SI50 Standard Cylinder SI50X1000FA with the SAI50X1000FA
To replace the discontinued SI50X1000FA, order the SAI50X1000FA. Confirm the ISO 15552 FA flange interface, the 50 mm bore, the 1000 mm stroke, and the G1/4 port (available in PT, G, or NPT threads). This SKU has no magnet (-S), so it cannot support legacy CS1-B/DS1-B sensors; if position detection is required, select an SAI model with the S suffix. For sizing alternatives, a neighbouring 40 mm bore yields 628 N push at 0.5 MPa, while a 63 mm bore provides 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates near stroke end—so for load holding, consider an external pilot check valve or the SAIL/BSAI lock variants. Finally, at 1000 mm of travel, prevent rod bending by guiding the load externally to avoid side-loading.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1000FA
- ✓ 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 SI50X1000FA FAQ
Yes, the SI50X1000FA is discontinued. The direct replacement is the SAI50X1000FA. It shares the identical ISO 15552 mounting interface, 50 mm bore, 1000 mm stroke, output force, G1/4 port, and FA flange, fitting directly into existing fixtures.
This double-acting cylinder features a G1/4 air port and provides a push force of 982 N and a pull force of 825 N at 0.5 MPa. At 0.7 MPa it pushes 1374 N, and 1767 N at 0.9 MPa. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1000FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1000FA replacement — usually within 7-8 hours.