This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X600STC, 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 SI50X600STC
The AirTAC Airtac SI50 Standard Cylinder SI50X600STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 600mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X600STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke600 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X600STC
- 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 SI50X600STC
The AirTAC SI50X600STC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 600mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50X600STC, which shares the exact same interface, bore, stroke, force, port and mounting.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked. This unit includes a magnet for CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50X600STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X600STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X600STC |
| Bore size | Ø50 mm |
| Stroke | 600 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 SAI50X600STC 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 SAI50X600STC 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 SI50X600STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×600 | 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 SI50X600STC Is Used
Long-Stroke Diversion
Pushes packages across a 600mm conveyor lane using the 982 N thrust class, requiring an external guide to absorb side loads.
Vertical Lift Gate
Raises a 50kg material gate using the TC trunnion mount for pivoting, relying on a pilot check valve to hold the load safely.
Tooling Ejector
Extracts machined parts from a deep fixture, utilizing the 30mm adjustable air cushion to decelerate the rod at stroke end.
Replacing the Airtac SI50 Standard Cylinder SI50X600STC with the SAI50X600STC
To replace the SI50X600STC, order the SAI50X600STC. Confirm the ISO 15552 TC trunnion mount, 50mm bore, 600mm stroke, G1/4 port and the -S magnet. For sizing, a 40mm bore yields 628 N push at 0.5 MPa, while a 63mm bore yields 1559 N. This 600mm stroke requires an external guide to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X600STC
- ✓ 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 SI50X600STC FAQ
Yes, the SI50X600STC is discontinued. The direct replacement is the SAI50X600STC. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 600mm stroke, 982 N force, G1/4 port and TC mounting.
It features a G1/4 air port. Force ratings are 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. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X600STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X600STC replacement — usually within 7-8 hours.