This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX75S, 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 SI50AX75S
The AirTAC Airtac SI50 Standard Cylinder SI50AX75S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX75S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX75S
- 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 SI50AX75S
The AirTAC SI50AX75S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 75mm stroke, and a built-in piston magnet. Delivering 982 N of push force at 0.5 MPa through a G1/4 port, it is directly replaced by the SAI50AX75S. This direct upgrade shares identical mounting interface, output, and cushion dimensions, fitting existing fixtures perfectly.
The SAI replacement introduces an upgraded piston seal featuring two Y-shaped one-way elements for low start-up pressure and extended life. This specific SI50AX75S variant uses an SUS420J2 stainless steel rod (the -A option) for corrosion resistance, and its -S magnet supports legacy CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50AX75S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX75S |
| Bore size | Ø50 mm |
| Stroke | 75 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 SAI50AX75S 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 SAI50AX75S 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 SI50AX75S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SI50AX75S Is Used
Medium Force Actuation
Drives 50 kg vertical clamps and mid-power presses using 982 N of thrust at 0.5 MPa, leveraging the SUS420J2 stainless rod for corrosion resistance.
Sorter Diverter
Pivots 75mm stroke diverters on packaging lines with a 30-800 mm/s speed range, safely handling loads near the 589 N working limit.
Replacing the Airtac SI50 Standard Cylinder SI50AX75S with the SAI50AX75S
To replace the SI50AX75S, order the SAI50AX75S. Confirm the ISO 15552 mounting interface, the 50mm bore, 75mm stroke, G1/4 port (PT/G/NPT thread), and your specific mounting accessory. Retain the -S magnet for current AirTAC switches and the -A SUS420J2 stainless rod option. The SAI family also adds SAIL (air-released lock), SAIF (built-in valve), and BSAI (clamp-lock) variants the SI lacked. A plain cylinder drifts on air loss, as the cushion only decelerates; for load holding, use the SAIL/BSAI lock variant or an external pilot check valve. If upsizing, the 63mm bore yields 1559 N push at 0.5 MPa; if downsizing, the 40mm bore yields 628 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX75S
- ✓ 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 SI50AX75S FAQ
Yes, the SI50AX75S is discontinued. The direct replacement is the SAI50AX75S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 75mm stroke, 982 N force, G1/4 port, and mounting interface.
This double-acting cylinder has a G1/4 air port. It delivers a push force of 982 N and a pull force of 825 N at 0.5 MPa. At 0.7 MPa it pushes 1374 N, and the theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX75S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX75S replacement — usually within 7-8 hours.