This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X800STC, 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 SI50X800STC
The AirTAC Airtac SI50 Standard Cylinder SI50X800STC 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 SAI50X800STC, 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 → SAI50X800STC
- 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 SI50X800STC
The AirTAC SI50X800STC is a discontinued double-acting ISO 15552 profile cylinder with an 800 mm stroke, delivering a 982 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50X800STC. This direct upgrade matches the original bore, stroke, force, port and TC trunnion mounting interface, fitting existing fixtures perfectly.
The SAI revision upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, and Viton H seals are available for high-heat environments.
Airtac SI50 Standard Cylinder SI50X800STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X800STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X800STC |
| 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 SAI50X800STC 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 SAI50X800STC 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 SI50X800STC
| 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 SI50X800STC Is Used
Long-Stroke Diversion
Pushes packages across a 800 mm conveyor lane transition using the 982 N thrust class and TC trunnion mount to pivot smoothly.
Vertical Lift Gate
Raises a light 50 kg mezzanine access gate, relying on the double-acting piston to manage the full 800 mm extension.
Material Extraction
Withdraws machined parts from a deep fixture, utilizing the 800 mm stroke and adjustable end cushions to decelerate the load.
Replacing the Airtac SI50 Standard Cylinder SI50X800STC with the SAI50X800STC
To replace the SI50X800STC, order the SAI50X800STC. Verify your ISO 15552 TC trunnion mounting hardware, the G1/4 air port, and the M16x1.5 rod thread. The 800 mm stroke is well within the 1200 mm standard limit, but at this length you must account for side-load and rod-bending risks—use an external guide to prevent premature wear. Sizing alternatives: a 40 mm bore gives 628 N push, while a 63 mm bore yields 1559 N. Because a standard cylinder drifts without live air, use the SAIL or BSAI lock variant, or an external pilot check valve, if you need to hold a load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X800STC
- ✓ 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 SI50X800STC FAQ
Yes, the SI50X800STC is discontinued. The direct replacement is the SAI50X800STC, which shares the identical ISO 15552 mounting interface, 50 mm bore, 800 mm stroke, force, G1/4 port and TC trunnion mount.
It features a G1/4 air port and provides 982 N push / 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. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X800STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X800STC replacement — usually within 7-8 hours.