This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X180, 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 SI50X180
The AirTAC Airtac SI50 Standard Cylinder SI50X180 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 180mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X180, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke180 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X180
- 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 SI50X180
The AirTAC SI50X180 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 180mm stroke, delivering 982N push and 825N pull at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X180, matching the exact interface, force and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants absent from the SI line. Note this specific SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X180 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X180 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X180 |
| Bore size | Ø50 mm |
| Stroke | 180 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 SAI50X180 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 SAI50X180 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 SI50X180
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×180 | 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 SI50X180 Is Used
Package Diverting
Actuates diverting arms on packaging lines, using the 982N push force at 0.5MPa to push cartons smoothly onto adjacent conveyors.
Clamp Actuation
Drives medium-duty clamping fixtures for machining, providing reliable holding with its 825N pull force while enduring shop temperatures.
Replacing the Airtac SI50 Standard Cylinder SI50X180 with the SAI50X180
To replace the SI50X180, order the SAI50X180: it drops into existing fixtures per the ISO 15552 mounting interface with the same 50mm bore, 180mm stroke, G1/4 port and M16x1.5 rod thread. Confirm your mounting accessory (LB, FA, TC, etc.) and thread standard (PT/G/NPT). Because this SKU has no -S magnet, you cannot mount position sensors; if sensing is needed, select a magnet-equipped SAI50X180S. For sizing, a 40mm bore gives 628N push at 0.5MPa, while a 63mm bore offers 1559N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variant. At 180mm stroke, side-load and rod-bending risks are low, but ensure correct alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X180
- ✓ 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 SI50X180 FAQ
Yes, the SI50X180 is discontinued. The direct replacement is the AirTAC SAI50X180. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 50mm bore, 180mm stroke, output force, G1/4 port and mounting accessories.
This double-acting cylinder features a G1/4 air port and M16x1.5 rod thread. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa. Operating speed is 30-800mm/s.
Request a Quote for the SAI50X180
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X180 replacement — usually within 7-8 hours.