This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X810STC, 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 SI50X810STC
The AirTAC Airtac SI50 Standard Cylinder SI50X810STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 810mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X810STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke810 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X810STC
- 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 SI50X810STC
The AirTAC SI50X810STC is a discontinued double-acting ISO 15552 profile cylinder with an 810 mm stroke, delivering 982 N push force at 0.5 MPa. It is replaced by the SAI50X810STC. This direct successor shares the exact bore, stroke, G1/4 port and TC trunnion mounting interface, fitting existing fixtures seamlessly.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The original SI -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family introduces SAIL and BSAI lock variants absent in the SI line.
Airtac SI50 Standard Cylinder SI50X810STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X810STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X810STC |
| Bore size | Ø50 mm |
| Stroke | 810 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 SAI50X810STC 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 SAI50X810STC 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 SI50X810STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×810 | 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 SI50X810STC Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 810 mm extension with external guides to prevent rod bending.
Replacing the Airtac SI50 Standard Cylinder SI50X810STC with the SAI50X810STC
To replace the SI50X810STC, order the SAI50X810STC. Verify the ISO 15552 TC trunnion interface, 50 mm bore, 810 mm stroke, G1/4 port, and the -S magnet for current AirTAC switches. Sizing context: a 40 mm bore yields 628 N push at 0.5 MPa, while a 63 mm bore yields 1559 N. Because this is a long 810 mm stroke, use an external guide to prevent rod bending and side loads. A plain cylinder drifts without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X810STC
- ✓ 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 SI50X810STC FAQ
Yes, the SI50X810STC is discontinued. The direct replacement is the SAI50X810STC. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 810 mm stroke, G1/4 port, and TC trunnion mounting.
The G1/4 port bore delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. The air cushion decelerates the load but does not hold it without live air.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X810STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X810STC replacement — usually within 7-8 hours.