This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1450S, 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 SI50X1450S
The AirTAC SI50 Standard Cylinder SI50X1450S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1450mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1450S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1450 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1450S
- 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 SI50X1450S
The AirTAC SI50X1450S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore and 1450mm stroke. Because 1450mm exceeds the 1200mm standard maximum for this bore, it is a non-standard made-to-order unit. It delivers 982 N push force at 0.5 MPa and uses a G1/4 air port. AirTAC replaced this legacy series with the SAI50X1450S, a direct upgrade sharing the exact same ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B sensors. Note that a plain cylinder drifts on air loss; for load holding, consider the SAIL lock or BSAI clamp-lock variants.
Airtac SI50 Standard Cylinder SI50X1450S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1450S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1450S |
| Bore size | Ø50 mm |
| Stroke | 1450 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 SAI50X1450S 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 SAI50X1450S 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 SI50X1450S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1450 | 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 SI50X1450S Is Used
Extended-Reach Diversion
Pushes packages across wide conveyor lanes over the full 1450mm extension, relying on external guides to prevent rod bending during the long stroke.
High-Bay Ejection
Ejects stored goods from deep racking systems where the 982 N push force at 0.5 MPa easily handles standard totes.
Vertical Lowering
Lowers materials in automated material handling setups, requiring a pilot check valve since the plain cylinder drifts without live air pressure.
Replacing the Airtac SI50 Standard Cylinder SI50X1450S with the SAI50X1450S
To replace the discontinued SI50X1450S, order the SAI50X1450S direct equivalent, confirming the ISO 15552 mounting interface, 50mm bore, 1450mm non-standard stroke, G1/4 port (PT/G/NPT thread options), and mounting accessory. Because this 1450mm stroke exceeds the 1200mm standard maximum, expect a made-to-order lead time and ensure external guides are used to prevent rod bending and side-load damage over the long extension. Sizing both ways: a neighbouring 63mm bore offers higher force (1559 N push @0.5 MPa), while a 40mm bore offers less (628 N). This plain cylinder does not hold load without live air—the cushion only decelerates. For secure holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1450S
- ✓ 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 SI50X1450S FAQ
Yes, the SI50X1450S is discontinued. The direct replacement is the AirTAC SAI50X1450S. It shares the identical ISO 15552 mounting interface, 50mm bore, 1450mm stroke, output force, and G1/4 port, fitting directly into existing fixtures.
This double-acting cylinder 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 1767 N at 0.9 MPa. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1450S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1450S replacement — usually within 7-8 hours.