This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X80S, 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 SI50X80S
The AirTAC Airtac SI50 Standard Cylinder SI50X80S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X80S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X80S
- 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 SI50X80S
The AirTAC SI50X80S is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50X80S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, and output force.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X80S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X80S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X80S |
| Bore size | Ø50 mm |
| Stroke | 80 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 SAI50X80S 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 SAI50X80S 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 SI50X80S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×80 | 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 SI50X80S Is Used
Mid-Force Clamping
Secures workholding fixtures in CNC machining, utilizing the 982 N push force to lock aluminium and steel components firmly during milling.
Package Diversion
Powers 80 mm stroke diverting arms on packaging lines, providing rapid actuation to route boxes at speeds up to 800 mm/s.
Replacing the Airtac SI50 Standard Cylinder SI50X80S with the SAI50X80S
To replace the SI50X80S, order the SAI50X80S and confirm the ISO 15552 mounting interface, G1/4 port, and M16x1.5 rod thread match your fixture. The built-in magnet (-S) works with legacy CS1-B/DS1-B sensors, though the SAI uses current AirTAC switches. If you need more force, the neighboring 63 mm bore yields 1559 N at 0.5 MPa; if less is required, the 40 mm bore gives 628 N. Note that a plain cylinder drifts without live air—the cushion only decelerates—so use a SAIL or BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X80S
- ✓ 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 SI50X80S FAQ
Yes, the AirTAC SI50X80S is discontinued. The direct replacement is the SAI50X80S. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 80 mm stroke, G1/4 port, and mounting interface to fit existing setups.
The 50 mm bore features a G1/4 air port and delivers 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.
Request a Quote for the SAI50X80S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X80S replacement — usually within 7-8 hours.