This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X860STC, 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 SI50X860STC
The AirTAC Airtac SI50 Standard Cylinder SI50X860STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 860mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X860STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke860 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X860STC
- 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 SI50X860STC
The AirTAC SI50X860STC is a discontinued double-acting ISO 15552 profile cylinder with an 860 mm stroke, delivering 982 N push force at 0.5 MPa. It features a G1/4 port, M16x1.5 rod thread, and a TC trunnion mount. The direct replacement is the SAI50X860STC, retaining the exact bore, stroke, force, port, and mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. Note that Viton H seals can raise the temperature limit to 150 C.
Airtac SI50 Standard Cylinder SI50X860STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X860STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X860STC |
| Bore size | Ø50 mm |
| Stroke | 860 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 SAI50X860STC 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 SAI50X860STC 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 SI50X860STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×860 | 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 SI50X860STC Is Used
Long-Stroke Diversion
Drives large packages across wide conveyor belts using the 860 mm stroke and 982 N push force at 0.5 MPa.
Pneumatic Slide Transfer
Shifts heavy workpieces between machining stations, relying on the TC trunnion mount to absorb axial misalignment.
Replacing the Airtac SI50 Standard Cylinder SI50X860STC with the SAI50X860STC
To replace the SI50X860STC, order the SAI50X860STC. Confirm the ISO 15552 TC trunnion mounting interface, G1/4 port, and the -S magnet for switch sensing. This 50 mm bore yields 982 N push at 0.5 MPa; sizing down to a 40 mm bore drops force to 628 N, while sizing up to 63 mm increases it to 1559 N. Because the 860 mm stroke is long, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X860STC
- ✓ 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 SI50X860STC FAQ
Yes, the AirTAC SI50X860STC is discontinued. The direct replacement is the SAI50X860STC. It is dimensionally interchangeable per ISO 15552, matching the bore, stroke, force, G1/4 port, and TC mounting interface.
This double-acting cylinder features a G1/4 air port. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and 1767 N push at 0.9 MPa, with a theoretical maximum force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X860STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X860STC replacement — usually within 7-8 hours.