This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX800S, 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 SI50AX800S
The AirTAC Airtac SI50 Standard Cylinder SI50AX800S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 800mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX800S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX800S
- 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 SI50AX800S
The AirTAC SI50AX800S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 800mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is SAI50AX800S, retaining identical ISO 15552 mounting dimensions, stroke, and force.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. This SI50AX800S includes a SUS420J2 stainless rod and a piston magnet for CS1-B/DS1-B sensors. Note: cushions decelerate but do not hold loads; use SAIL or BSAI lock variants.
Airtac SI50 Standard Cylinder SI50AX800S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX800S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX800S |
| Bore size | Ø50 mm |
| Stroke | 800 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 SAI50AX800S 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 SAI50AX800S 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 SI50AX800S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×800 | 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 SI50AX800S Is Used
Long-Stroke Diversion
Pushes packages across a 800mm transfer belt using the 982 N push force at 0.5 MPa.
Stainless Rod Actuation
Drives tooling stages in humid environments using the SUS420J2 corrosion-resistant rod option.
Replacing the Airtac SI50 Standard Cylinder SI50AX800S with the SAI50AX800S
To replace the SI50AX800S, order SAI50AX800S to match the 50mm bore, 800mm stroke, G1/4 port, M16x1.5 thread, and ISO 15552 mounting. Keep the -S magnet and -A SUS420J2 rod. For higher force, the 63mm bore yields 1559 N push at 0.5 MPa; for less, the 40mm bore yields 628 N. At 800mm stroke, prevent rod bending by using an external guide to manage side loads. The cushion only decelerates; for load holding on air loss, specify SAIL, BSAI, or a pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX800S
- ✓ 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 SI50AX800S FAQ
Yes, the SI50AX800S is discontinued. The direct replacement is the SAI50AX800S. It shares the same ISO 15552 mounting interface, 50mm bore, 800mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
This double-acting cylinder features a G1/4 port. It provides 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX800S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX800S replacement — usually within 7-8 hours.