This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1520STC, 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 SI50X1520STC
The AirTAC SI50 Standard Cylinder SI50X1520STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1520mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1520STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1520 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1520STC
- 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 SI50X1520STC
The AirTAC SI50X1520STC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1520mm stroke. It delivers 982N push force at 0.5MPa through a G1/4 port. Because 1520mm exceeds the 1200mm standard stroke maximum, this is a non-standard, made-to-order unit requiring external guides to prevent rod bending over such a long extension.
You must replace it with the direct replacement SAI50X1520STC. It shares the exact ISO 15552 mounting interface, TC trunnion, force, and port. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. The original -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X1520STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1520STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1520STC |
| Bore size | Ø50 mm |
| Stroke | 1520 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 SAI50X1520STC 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 SAI50X1520STC 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 SI50X1520STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1520 | 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 SI50X1520STC Is Used
Long-Reach Diversion
Actuates routing gates on extended conveyor lines where a 1520mm stroke is required to shift products between parallel lanes.
High-Bay Extraction
Extracts totes from deep shelving racks, utilizing the 982N push force to slide loads out smoothly for pickup.
Material Lowering
Lowers packaging materials from elevated hoppers, safely decelerating the 50kg payload at stroke end via adjustable cushions.
Replacing the Airtac SI50 Standard Cylinder SI50X1520STC with the SAI50X1520STC
To replace the SI50X1520STC, order the SAI50X1520STC. Confirm the ISO 15552 TC trunnion mount, G1/4 port, M16x1.5 rod thread, and the -S magnet. When sizing, note the 50mm bore yields 982N push at 0.5MPa; if undersized, the 63mm bore offers 1559N. For load holding, a plain cylinder drifts on air loss—the cushion only decelerates. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant adds a built-in valve. Because the 1520mm stroke exceeds the 1200mm standard, expect a made-to-order lead time and ensure external guides prevent rod-bending side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1520STC
- ✓ 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 SI50X1520STC FAQ
Yes, the SI50X1520STC is discontinued. The direct replacement is the SAI50X1520STC. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 50mm bore, 1520mm stroke, TC trunnion mount, G1/4 port, and output force.
The 50mm bore provides 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa. Operating speed is 30-800mm/s. It uses a G1/4 port and M16x1.5 rod thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1520STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1520STC replacement — usually within 7-8 hours.