This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X86S, 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 SI50X86S
The AirTAC Airtac SI50 Standard Cylinder SI50X86S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 86mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X86S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke86 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X86S
- 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 SI50X86S
The AirTAC SI50X86S is a discontinued double-acting ISO 15552 profile cylinder with an 86 mm stroke, delivering 982 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50X86S, a direct upgrade retaining the exact bore, stroke, output force, and mounting interface.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SI50X86S includes a magnet for CS1-B/DS1-B sensors, while the SAI family adds lock and valve variants like the SAIL and BSAI.
Airtac SI50 Standard Cylinder SI50X86S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X86S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X86S |
| Bore size | Ø50 mm |
| Stroke | 86 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 SAI50X86S 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 SAI50X86S 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 SI50X86S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×86 | 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 SI50X86S Is Used
Package Diversion
Drives sorting pop-up arms on packaging lines, utilizing the 86 mm stroke to redirect cartons at high speeds without overwhelming the mechanism.
Clamp Actuation
Provides reliable clamping force for light machining fixtures, delivering 982 N push at 0.5 MPa to hold aluminum components securely.
Replacing the Airtac SI50 Standard Cylinder SI50X86S with the SAI50X86S
To replace the SI50X86S, order the SAI50X86S keeping the exact 50 mm bore, 86 mm stroke, G1/4 port, and ISO 15552 mounting interface. Confirm your thread standard (PT/G/NPT) and mounting accessory (LB, FA, TC, etc.). The -S suffix means a magnet is present for legacy CS1-B/DS1-B switches; the SAI uses current AirTAC sensors. For sizing, this bore yields 982 N push at 0.5 MPa; if less force is needed, a 40 mm bore gives 628 N, or step up to a 63 mm bore for 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X86S
- ✓ 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 SI50X86S FAQ
Yes, the SI50X86S is discontinued. The direct replacement is the AirTAC SAI50X86S. It is dimensionally interchangeable per ISO 15552, matching the 50 mm bore, 86 mm stroke, G1/4 port, and mounting fixtures perfectly, while adding an upgraded piston seal.
The 50 mm bore 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 of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Request a Quote for the SAI50X86S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X86S replacement — usually within 7-8 hours.