This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X450N, 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 SI50X450N
The AirTAC SI50 Standard Cylinder SI50X450N 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 SAI50X450N, 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 → SAI50X450N
- 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 SI50X450N
The AirTAC SI50X450N is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 450mm stroke. Providing 982N push force at 0.5MPa, it features a G1/4 port, M16x1.5 rod thread, and NBR seals for -20 to +70C. The direct replacement is the SAI50X450N, matching the interface, bore, force, and port.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This no-magnet SKU cannot take a sensor, unlike the CS1-B/DS1-B legacy switches used on -S models. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X450N Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X450N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X450N |
| 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 SAI50X450N 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 SAI50X450N 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 SI50X450N
| 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 SI50X450N Is Used
Material Diverting
Actuates diverter gates on packaging lines, utilizing the 982N push force at 0.5MPa to reliably push cartons between routing lanes.
Vertical Lift Stops
Raises product stops in low-inertia vertical lift stations, safely handling loads around the 50kg computed vertical lift threshold.
Long-Stroke Ejection
Ejects machined parts from fixtures using the 450mm stroke, requiring external guide rails to prevent rod bending over the extended length.
Replacing the Airtac SI50 Standard Cylinder SI50X450N with the SAI50X450N
To replace the SI50X450N, order the SAI50X450N. Verify the ISO 15552 mounting interface, 50mm bore, 450mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. Because this 450mm stroke exceeds 300mm, use external guides to prevent rod bending and side-load wear. Sizing both ways: a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore yields 1559N. Note that this plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. This no-S SKU cannot accept a sensor.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X450N
- ✓ 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 SI50X450N FAQ
Yes, the AirTAC SI50X450N is discontinued. The direct replacement is the SAI50X450N. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 450mm stroke, 982N force, G1/4 port, and mounting accessories.
The 50mm bore uses a G1/4 port. Force output is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. It operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X450N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X450N replacement — usually within 7-8 hours.