This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X175S, 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 SI50X175S
The AirTAC Airtac SI50 Standard Cylinder SI50X175S 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 SAI50X175S, 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 → SAI50X175S
- 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 SI50X175S
The AirTAC SI50X175S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 175 mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa, operating through a G1/4 port with a 20 mm rod. The direct replacement is the SAI50X175S, retaining the exact ISO 15552 mounting interface, bore, stroke, force and port for seamless fixture integration.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X175S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X175S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X175S |
| 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 SAI50X175S 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 SAI50X175S 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 SI50X175S
| 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 SI50X175S Is Used
Package Diverting
Pushes parcels on a sorting line using 982 N of force, with the 175 mm stroke clearing the belt lane for downstream routing.
Clamp Actuation
Secures medium workpieces during machining, applying up to 200 kgf theoretical max force at 1.0 MPa for rigid holding.
Replacing the Airtac SI50 Standard Cylinder SI50X175S with the SAI50X175S
To replace the SI50X175S, order the SAI50X175S. Confirm the ISO 15552 mounting interface, the 50 mm bore, 175 mm stroke, G1/4 port (PT/G/NPT thread options), M16x1.5 rod thread, and the -S magnet for current AirTAC switches. Sizing both ways: a 63 mm bore yields 1559 N push at 0.5 MPa for heavier loads, while a 40 mm bore offers 628 N if you need less force. A plain cylinder drifts on air loss as the 30 mm cushion only decelerates; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. For this 175 mm stroke, ensure guide alignment to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X175S
- ✓ 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 SI50X175S FAQ
Yes, the SI50X175S is discontinued. The direct replacement is the SAI50X175S. It is dimensionally interchangeable per ISO 15552, matching the 50 mm bore, 175 mm stroke, G1/4 port and mounting interface, so it drops into existing fixtures.
The 50 mm bore uses a G1/4 port. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. The speed range is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X175S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X175S replacement — usually within 7-8 hours.