This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X110S, 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 SI50X110S
The AirTAC Airtac SI50 Standard Cylinder SI50X110S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 110mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X110S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke110 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X110S
- 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 SI50X110S
The AirTAC SI50X110S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 110mm stroke. Delivering 982N push force at 0.5MPa, it features a G1/4 port and an integrated magnet for position sensing. AirTAC replaced this legacy unit with the SAI50X110S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI replacement introduces an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family also adds SAIL, SAIF, and BSAI lock or valve variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X110S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X110S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X110S |
| Bore size | Ø50 mm |
| Stroke | 110 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 SAI50X110S 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 SAI50X110S 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 SI50X110S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×110 | 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 SI50X110S Is Used
Package Diverting
Actuates routing gates on packaging lines, using the 982N thrust to push cartons smoothly at cycle speeds within the 30-800 mm/s range.
Clamp Actuation
Provides reliable clamping force for mid-weight machining fixtures, safely holding workpieces with a 589N working load margin.
Replacing the Airtac SI50 Standard Cylinder SI50X110S with the SAI50X110S
To replace the SI50X110S, order the SAI50X110S and confirm your ISO 15552 mounting interface, 110mm stroke, G1/4 port (PT/G/NPT), and accessory type. The built-in magnet (-S) works with legacy CS1-B/DS1-B switches, though the SAI uses current AirTAC sensors. For sizing both ways, a 50mm bore yields 982N push at 0.5MPa; step down to a 40mm bore for 628N, or up to a 63mm bore for 1559N. Remember a plain cylinder drifts without live air—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding. At 110mm stroke, side-load is minimal, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X110S
- ✓ 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 SI50X110S FAQ
Yes, the SI50X110S is discontinued. The direct replacement is the AirTAC SAI50X110S. It shares the identical ISO 15552 mounting interface, 50mm bore, 110mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly while upgrading the piston seal.
The 50mm bore uses a G1/4 port and M16x1.5 rod thread. Force output is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, with a theoretical max of 200kgf at 1.0MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X110S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X110S replacement — usually within 7-8 hours.