This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX115S, 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 SI50AX115S
The AirTAC Airtac SI50 Standard Cylinder SI50AX115S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 115mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX115S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke115 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX115S
- 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 SI50AX115S
The AirTAC SI50AX115S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 115mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50AX115S, which retains the exact same interface, force, and mounting dimensions.
This SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SI50AX115S features a SUS420J2 stainless steel rod and a piston magnet for CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50AX115S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX115S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX115S |
| Bore size | Ø50 mm |
| Stroke | 115 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 SAI50AX115S 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 SAI50AX115S 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 SI50AX115S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×115 | 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 SI50AX115S Is Used
Mid-Force Actuation
Drives 50 kg vertical lifts and 589 N working loads in automated machining fixtures using the G1/4 port.
Material Diversion
Powers 115mm stroke diverters and sorting gates requiring responsive 30-800 mm/s cycling speeds.
Stainless Rod Handling
Actuates packaging stops and lifts in humid washdown environments using the SUS420J2 rod option.
Replacing the Airtac SI50 Standard Cylinder SI50AX115S with the SAI50AX115S
To replace the SI50AX115S, order the SAI50AX115S. Confirm the ISO 15552 mounting interface, 115mm stroke, G1/4 port (PT/G/NPT thread), and the SUS420J2 stainless rod. The -S magnet enables CS1-B/DS1-B sensors, though the SAI uses current AirTAC switches. At 0.5 MPa it yields 982 N push and 825 N pull; if undersized, the 63mm bore provides 1559 N. A plain cylinder drifts on air loss as the cushion only decelerates, so use an external rod lock or pilot check valve for holding, or specify the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX115S
- ✓ 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 SI50AX115S FAQ
Yes, the SI50AX115S is discontinued. The direct replacement is the SAI50AX115S. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 115mm stroke, G1/4 port, and mounting fixtures.
This double-acting cylinder features a G1/4 air port and M16x1.5 rod thread. It provides 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX115S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX115S replacement — usually within 7-8 hours.