This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX105, 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 SI50AX105
The AirTAC Airtac SI50 Standard Cylinder SI50AX105 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 SAI50AX105, 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 → SAI50AX105
- 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 SI50AX105
The AirTAC SI50AX105 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 105mm stroke, delivering 982N push and 825N pull at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50AX105, a direct upgrade sharing the exact ISO 15552 mounting interface, M16x1.5 rod thread, and force class.
The SAI50AX105 features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors; the SAI family also adds SAIL lock, SAIF valve, and BSAI clamp-lock variants the SI line lacked.
Airtac SI50 Standard Cylinder SI50AX105 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX105 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX105 |
| 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 SAI50AX105 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 SAI50AX105 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 SI50AX105
| 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 SI50AX105 Is Used
Package Diverting
Drives diverting arms on packaging lines where the 982N push force at 0.5MPa easily redirects standard cartons.
Clamping Fixtures
Secures workpieces during machining, utilizing the 825N pull force to hold parts firmly against stops.
Replacing the Airtac SI50 Standard Cylinder SI50AX105 with the SAI50AX105
To replace the SI50AX105, order the SAI50AX105 to retain the identical ISO 15552 mounting footprint, 105mm stroke, G1/4 port, and 30mm adjustable cushions. Because this SKU has no magnet, you cannot mount position sensors; if sensing is required, specify an SAI50X105S. The default carbon-steel rod can be swapped for the SUS420J2 (-A) stainless option for corrosive environments. Sizing both ways: a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore yields 1559N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX105
- ✓ 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 SI50AX105 FAQ
Yes, the SI50AX105 is discontinued. The direct replacement is the SAI50AX105, which shares the identical ISO 15552 mounting interface, 50mm bore, 105mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/4 air port. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX105
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX105 replacement — usually within 7-8 hours.