This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X160FA, 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 SI50X160FA
The AirTAC Airtac SI50 Standard Cylinder SI50X160FA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 160mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X160FA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke160 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X160FA
- 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 SI50X160FA
The AirTAC SI50X160FA is a discontinued double-acting ISO 15552 profile cylinder featuring a 50 mm bore, 160 mm stroke, and an FA flange mounting interface. It delivers 982 N of push force at 0.5 MPa via a G1/4 port. As a legacy unit, it must be replaced by the current-production SAI50X160FA, which provides a direct upgrade with identical ISO 15552 mounting dimensions, bore, stroke, output force, and port size.
The SAI replacement incorporates an upgraded piston seal utilizing two Y-shaped one-way elements for extended lifespan and lower start-up pressure. Because this specific SKU lacks the -S magnet suffix, it cannot accept a position sensor; legacy SI switches were CS1-B/DS1-B. The SAI family also introduces lock and valve variants (SAIL, SAIF, BSAI) absent in the original SI line.
Airtac SI50 Standard Cylinder SI50X160FA Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X160FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X160FA |
| Bore size | Ø50 mm |
| Stroke | 160 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 SAI50X160FA 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 SAI50X160FA 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 SI50X160FA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×160 | 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 SI50X160FA Is Used
Clamping Fixtures
Provides reliable 982 N clamping force at 0.5 MPa for holding medium-weight machined components during milling or drilling operations.
Package Diverters
Drives FA flange-mounted diverter arms on packaging lines, utilizing the 160 mm stroke to push cartons efficiently at speeds up to 800 mm/s.
Replacing the Airtac SI50 Standard Cylinder SI50X160FA with the SAI50X160FA
To replace the discontinued SI50X160FA, order the SAI50X160FA. Confirm the ISO 15552 FA flange interface, 50 mm bore, 160 mm stroke, and G1/4 port (available in PT, G, or NPT threads). Sizing context: a 50 mm bore yields 982 N push at 0.5 MPa; dropping to a 40 mm bore reduces this to 628 N, while a 63 mm bore increases it to 1559 N. Note that a plain cylinder does not hold load on air loss—the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or specify the SAIL/BSAI lock variant. Since the stroke is under 300 mm, severe rod-bending side loads are less critical, but external guides are still recommended for off-center loads. This no-magnet SKU cannot accept switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X160FA
- ✓ 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 SI50X160FA FAQ
Yes, the AirTAC SI50X160FA is discontinued. The direct replacement is the SAI50X160FA. It features the same ISO 15552 FA flange mounting interface, 50 mm bore, 160 mm stroke, output force, and G1/4 port, fitting directly into existing fixtures without modification.
This 50 mm bore double-acting cylinder uses a G1/4 air port. Theoretical forces are: 982 N push and 825 N pull at 0.5 MPa; 1374 N push at 0.7 MPa; 1767 N push at 0.9 MPa; with a maximum force of 200 kgf at 1.0 MPa. The piston rod is 20 mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X160FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X160FA replacement — usually within 7-8 hours.