This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X105S, 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 SI50X105S
The AirTAC Airtac SI50 Standard Cylinder SI50X105S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 105mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X105S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke105 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X105S
- 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 SI50X105S
The AirTAC SI50X105S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 105mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X105S, matching the interface, force and mounting exactly.
Upgrading to the SAI brings a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family adds SAIL, SAIF and BSAI lock variants the SI lacked. This -S model carries a piston magnet for CS1-B/DS1-B sensors; the SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X105S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X105S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X105S |
| Bore size | Ø50 mm |
| Stroke | 105 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 SAI50X105S 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 SAI50X105S 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 SI50X105S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×105 | 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 SI50X105S Is Used
Package Diversion
Drives sorting pop-up arms on packaging lines, utilizing the 105mm stroke to push cartons weighing up to 50kg onto adjacent conveyors.
Clamp Actuation
Secures medium-weight aluminum extrusions during machining operations, providing 982N of clamping force at 0.5MPa.
Pallet Stopper
Acts as a pneumatic stop gate in pallet flow systems, extending 105mm to arrest incoming loads safely.
Replacing the Airtac SI50 Standard Cylinder SI50X105S with the SAI50X105S
To replace the SI50X105S, order the SAI50X105S. Confirm the ISO 15552 mounting interface, 50mm bore, 105mm stroke, G1/4 port (PT/G/NPT), and your mounting accessory. The -S suffix means a magnet for legacy CS1-B/DS1-B switches; the SAI uses current AirTAC switches. For sizing, a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore yields 1559N. The plain cylinder does not hold load without live air; for holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Rod material options include carbon steel, SUS420J2 (A) or SUS304 (B).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X105S
- ✓ 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 SI50X105S FAQ
Yes, the SI50X105S is discontinued. The direct replacement is the AirTAC SAI50X105S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 105mm stroke, G1/4 port and mounting fixtures.
The 50mm bore features a G1/4 air port and M16x1.5 rod thread. Force output is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical maximum of 200 kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X105S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X105S replacement — usually within 7-8 hours.