This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X450SH, 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 SI50X450SH
The AirTAC SI50 Standard Cylinder SI50X450SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 450mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X450SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke450 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X450SH
- 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 SI50X450SH
The AirTAC SI50X450SH is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 450mm stroke, and Viton H high-temperature seals (0 to 150 C). It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50X450SH, retaining identical ISO 15552 mounting, force, and accessories.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Because the stroke is 450mm, use external guides to prevent rod bending. The -S magnet supports CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI variants.
Airtac SI50 Standard Cylinder SI50X450SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X450SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X450SH |
| Bore size | Ø50 mm |
| Stroke | 450 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 SAI50X450SH 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 SAI50X450SH 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 SI50X450SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×450 | 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 SI50X450SH Is Used
High-Temperature Ejection
Deploys the 450mm stroke and Viton H seals to push hot molded parts out of a 150 C press area safely.
Long-Reach Diversion
Uses the 982 N push force at 0.5 MPa to deflect heavy packages across a wide transfer station.
Replacing the Airtac SI50 Standard Cylinder SI50X450SH with the SAI50X450SH
To replace the SI50X450SH, order the SAI50X450SH. Confirm the ISO 15552 mounting interface, 50mm bore, 450mm stroke, G1/4 port, M16x1.5 rod thread, and the -S magnet for current AirTAC switches. If you need less force, the 40mm bore yields 628 N push at 0.5 MPa; for more power, the 63mm bore provides 1559 N. For high-heat environments, retain the Viton H seal. At 450mm stroke, mount external guides to absorb side loads and prevent rod bending. The air cushion only decelerates; it does not hold load. For dead-load holding on air loss, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X450SH
- ✓ 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 SI50X450SH FAQ
Yes, the SI50X450SH is discontinued. The direct replacement is the SAI50X450SH. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 450mm stroke, G1/4 port, and mounting interface.
The 50mm bore uses a G1/4 port. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X450SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X450SH replacement — usually within 7-8 hours.