This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X570STC, 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 SI50X570STC
The AirTAC Airtac SI50 Standard Cylinder SI50X570STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 570mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X570STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke570 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X570STC
- 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 SI50X570STC
The AirTAC SI50X570STC is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore, 570 mm stroke, and a TC trunnion mount. Delivering 982 N push force at 0.5 MPa via a G1/4 port, it is replaced by the SAI50X570STC. This direct SAI upgrade shares the exact ISO 15552 mounting interface, bore, stroke, and force, fitting existing fixtures perfectly.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants absent in the SI line. The built-in magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X570STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X570STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X570STC |
| Bore size | Ø50 mm |
| Stroke | 570 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 SAI50X570STC 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 SAI50X570STC 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 SI50X570STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×570 | 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 SI50X570STC Is Used
Material Diversion
Drives sorting flaps on packaging lines, utilizing the 982 N push force and TC trunnion mount to pivot heavy cardboard cartons reliably.
Long-Reach Ejection
Pushes machined parts out of a CNC workspace, where the 570 mm extension clears the cutting zone before the 30 mm cushion decelerates the rod.
Replacing the Airtac SI50 Standard Cylinder SI50X570STC with the SAI50X570STC
To replace this SI50X570STC with the SAI50X570STC, verify the ISO 15552 TC trunnion interface, 50 mm bore, 570 mm stroke, G1/4 port, and the -S magnet for CS1-B/DS1-B switches (the SAI uses current AirTAC switches). Sizing both ways: a neighbouring 63 mm bore offers 1559 N push at 0.5 MPa, while dropping to 40 mm yields 628 N. Note that a plain cylinder drifts without live air—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify an SAIL/BSAI lock variant. Because 570 mm exceeds 300 mm, use an external guide to prevent rod-bending side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X570STC
- ✓ 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 SI50X570STC FAQ
Yes, the AirTAC SI50X570STC is discontinued. The direct replacement is the SAI50X570STC. It shares the same ISO 15552 mounting interface, 50 mm bore, 570 mm stroke, output force, and G1/4 port, fitting your existing fixtures directly.
This double-acting cylinder features a G1/4 air port and M16x1.5 rod thread. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X570STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X570STC replacement — usually within 7-8 hours.