This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X150CA, 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 SI50X150CA
The AirTAC Airtac SI50 Standard Cylinder SI50X150CA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X150CA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X150CA
- 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 SI50X150CA
The AirTAC SI50X150CA is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 150mm stroke. Delivering 982 N push force at 0.5 MPa via a G1/4 port, it is replaced by the SAI50X150CA. This direct upgrade matches the exact CA clevis mounting interface, output force, and dimensions.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. For sensing, note this specific SKU lacks a magnet and cannot accept a switch. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X150CA Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X150CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X150CA |
| Bore size | Ø50 mm |
| Stroke | 150 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 SAI50X150CA 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 SAI50X150CA 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 SI50X150CA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×150 | 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 SI50X150CA Is Used
Mid-Tonnage Clamping
Secures workpieces in machining fixtures using the 982 N push force, with the 150mm stroke providing ample clearance for part loading and unloading.
Package Diversion
Actuates routing gates on packaging lines where the 825 N pull force at 0.5 MPa easily redirects moderate-weight cartons without lag.
Replacing the Airtac SI50 Standard Cylinder SI50X150CA with the SAI50X150CA
To replace the SI50X150CA, order the SAI50X150CA. Confirm the ISO 15552 CA clevis mount, 150mm stroke, G1/4 port, and M16x1.5 rod thread. Because this SKU has no magnet, you cannot mount CS1-B/DS1-B sensors; order a -S SAI variant if position detection is needed. For sizing, the 50mm bore yields 982 N push at 0.5 MPa; if less force is required, a 40mm bore provides 628 N, while an 80mm bore offers 2513 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or SAIL/BSAI lock variant to hold loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X150CA
- ✓ 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 SI50X150CA FAQ
Yes, the SI50X150CA is discontinued. The direct replacement is the SAI50X150CA. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 150mm stroke, CA clevis mount, and G1/4 port.
The G1/4 port feeds a 50mm bore that generates 982 N push and 825 N pull at 0.5 MPa. At 0.7 MPa push is 1374 N, and the theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X150CA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X150CA replacement — usually within 7-8 hours.