This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX175S, 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 SI50AX175S
The AirTAC Airtac SI50 Standard Cylinder SI50AX175S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 175mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX175S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke175 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX175S
- 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 SI50AX175S
The AirTAC SI50AX175S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 175mm stroke, and an SUS420J2 stainless steel rod. It delivers 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced this unit with the SAI50AX175S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. This magnet-ready (-S) model uses legacy CS1-B/DS1-B sensors, while the SAI family also adds SAIL, SAIF, and BSAI lock variants.
Airtac SI50 Standard Cylinder SI50AX175S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX175S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX175S |
| Bore size | Ø50 mm |
| Stroke | 175 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 SAI50AX175S 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 SAI50AX175S 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 SI50AX175S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×175 | 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 SI50AX175S Is Used
Stainless Rod Clamping
Ideal for fixture clamping in humid environments using the SUS420J2 stainless rod, delivering 825N pull force at 0.5MPa.
Mid-Stroke Diverting
Provides 175mm of travel to push packages on a line, safely handling a 589N working load with adjustable end cushions.
Replacing the Airtac SI50 Standard Cylinder SI50AX175S with the SAI50AX175S
To replace the SI50AX175S, order the SAI50AX175S. It drops into existing fixtures using the same ISO 15552 dimensions, 50mm bore, 175mm stroke, G1/4 port, and M16x1.5 rod thread. Confirm your mounting accessory (LB, FA, TC, etc.) and keep the -S magnet for position sensing. The -A rod material specifies the SUS420J2 stainless option for corrosion resistance over standard carbon steel. If you need more force, the neighbouring 63mm bore offers 1559N at 0.5MPa; if less is required, the 40mm bore provides 628N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding. For this 175mm stroke, ensure guide alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX175S
- ✓ 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 SI50AX175S FAQ
Yes, the SI50AX175S is discontinued. The direct replacement is the SAI50AX175S. It shares the same ISO 15552 mounting interface, 50mm bore, 175mm stroke, force, and G1/4 port, fitting existing fixtures perfectly.
It has a G1/4 port. Force ratings are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX175S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX175S replacement — usually within 7-8 hours.