This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X120CA, 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 SI50X120CA
The AirTAC Airtac SI50 Standard Cylinder SI50X120CA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 120mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X120CA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X120CA
- 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 SI50X120CA
The AirTAC SI50X120CA is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 120mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50X120CA, a direct sharing the exact same CA clevis mounting, M16x1.5 rod thread, and 30mm cushions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Because this specific SI SKU lacks the -S magnet suffix, it cannot accept a CS1-B/DS1-B sensor.
Airtac SI50 Standard Cylinder SI50X120CA Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X120CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X120CA |
| Bore size | Ø50 mm |
| Stroke | 120 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 SAI50X120CA 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 SAI50X120CA 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 SI50X120CA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×120 | 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 SI50X120CA Is Used
Clamp Actuation
Provides 982 N of push force at 0.5 MPa to secure mid-weight workpieces during machining operations.
Package Diverting
Uses the 120mm stroke to push cartons off a main conveyor belt line into secondary packing lanes.
Pallet Stops
Acts as a pneumatic stop gate for pallets entering a robotic wrapping cell, handling 50 kg vertical lift margins.
Replacing the Airtac SI50 Standard Cylinder SI50X120CA with the SAI50X120CA
To replace the SI50X120CA, order the SAI50X120CA. It drops into existing fixtures via the identical ISO 15552 interface and CA clevis accessory, preserving the 50mm bore, 120mm stroke, and G1/4 port. If you need more force, the 63mm bore yields 1559 N push at 0.5 MPa; if less is required, the 40mm bore provides 628 N. Note that a plain double-acting cylinder drifts on air loss—the cushion only decelerates near stroke end. For load holding, specify an external pilot check valve or explore the SAIL lock or BSAI clamp-lock variants. If you require position sensing, you must select a magnet-equipped SAI-S model, as this no-S legacy SKU cannot take a switch.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X120CA
- ✓ 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 SI50X120CA FAQ
Yes, the SI50X120CA is discontinued. The direct replacement is the SAI50X120CA. It shares the identical ISO 15552 mounting interface, 50mm bore, 120mm stroke, output force, G1/4 port, and CA clevis mounting, fitting directly into existing fixtures.
This double-acting cylinder features a G1/4 air port and delivers a push force of 982 N and pull force of 825 N at 0.5 MPa. At 0.7 MPa push is 1374 N, and at 0.9 MPa it is 1767 N. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X120CA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X120CA replacement — usually within 7-8 hours.