This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X175SN, 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 SI50X175SN
The AirTAC Airtac SI50 Standard Cylinder SI50X175SN 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 SAI50X175SN, 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 → SAI50X175SN
- 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 SI50X175SN
The AirTAC SI50X175SN is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 175 mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50X175SN, matching the exact interface, bore, stroke, force and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The -N denotes NBR seals (-20 to +70 C); Viton H raises this to 150 C. This -S magnet variant takes CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X175SN Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X175SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X175SN |
| 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 SAI50X175SN 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 SAI50X175SN 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 SI50X175SN
| 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 SI50X175SN Is Used
Package Diversion
Ideal for pushing 50 kg cartons off a belt line, utilizing the 982 N push force at 0.5 MPa with smooth end-cushioning.
Clamp Actuation
Provides reliable 50 kg vertical clamping pressure on machining fixtures, with the magnet confirming clamp position.
Pallet Stop Gate
Raises and lowers pallet stop gates in 175 mm strokes, dropping into existing ISO 15552 foot or flange mounts.
Replacing the Airtac SI50 Standard Cylinder SI50X175SN with the SAI50X175SN
To replace the SI50X175SN, order the SAI50X175SN. Confirm the ISO 15552 mounting interface, 50 mm bore, 175 mm stroke, G1/4 port (PT/G/NPT) and mounting accessory. The -S magnet enables current AirTAC switches (legacy CS1-B/DS1-B). Sizing both ways: a 63 mm bore gives 1559 N push @0.5 MPa, while a 40 mm bore yields 628 N. Plain cylinders drift on air loss; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. At 175 mm, side-load is minimal, but for strokes >=300 mm use guide rails to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X175SN
- ✓ 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 SI50X175SN FAQ
Yes, the SI50X175SN is discontinued. The direct replacement is the SAI50X175SN. It is dimensionally interchangeable per ISO 15552, keeping the same 50 mm bore, 175 mm stroke, output force, G1/4 port and mounting interface.
The G1/4 port feeds a 20 mm rod delivering 982 N push and 825 N pull at 0.5 MPa. At 0.7 MPa push is 1374 N, and 1767 N at 0.9 MPa. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X175SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X175SN replacement — usually within 7-8 hours.