This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X70FA, 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 SI50X70FA
The AirTAC Airtac SI50 Standard Cylinder SI50X70FA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 70mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X70FA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke70 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X70FA
- 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 SI50X70FA
The AirTAC SI50X70FA is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 70 mm stroke, delivering 982 N push force at 0.5 MPa. It features an extruded aluminum barrel, a 20 mm carbon steel rod, M16x1.5 rod thread, and a G1/4 air port. Because this SKU lacks the -S magnet suffix, it cannot accept a position sensor.
You should order the direct replacement SAI50X70FA. It shares the exact ISO 15552 FA flange mounting interface, bore, stroke, force, and port size. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
Airtac SI50 Standard Cylinder SI50X70FA Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X70FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X70FA |
| Bore size | Ø50 mm |
| Stroke | 70 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 SAI50X70FA 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 SAI50X70FA 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 SI50X70FA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×70 | 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 SI50X70FA Is Used
Clamp Actuation
Provides 982 N of clamping thrust at 0.5 MPa for securing mid-weight workpieces during machining operations.
Package Diverting
Drives a 70 mm stroke diverter arm to route boxes on a production line, operating efficiently at 30-800 mm/s.
Gate Control
Actuates access gates or machine guards using the fixed FA flange mount to handle repetitive shifting loads.
Replacing the Airtac SI50 Standard Cylinder SI50X70FA with the SAI50X70FA
To replace the SI50X70FA, order the SAI50X70FA. Confirm the ISO 15552 FA flange interface, 50 mm bore, 70 mm stroke, G1/4 port, and M16x1.5 thread. Since this non-S SKU has no magnet, sensing is impossible; if you need switches, specify an SAI with the -S option and use current AirTAC sensors. For sizing, the 50 mm bore yields 982 N push at 0.5 MPa; if you need less force, step down to a 40 mm bore (628 N), or step up to a 63 mm bore (1559 N) for more power. 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 or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X70FA
- ✓ 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 SI50X70FA FAQ
Yes, the SI50X70FA is discontinued. The direct replacement is the SAI50X70FA. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 50 mm bore, 70 mm stroke, FA flange, and G1/4 port. You simply order the SAI equivalent.
The G1/4 port feeds a 50 mm bore that generates 982 N push and 825 N pull at 0.5 MPa. At 0.7 MPa it pushes 1374 N, and the theoretical maximum force is 200 kgf at 1.0 MPa. The speed range is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X70FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X70FA replacement — usually within 7-8 hours.