This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X5, 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 SI50X5
The AirTAC Airtac SI50 Standard Cylinder SI50X5 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 5mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X5, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke5 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X5
- 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 SI50X5
The AirTAC SI50X5 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 5mm stroke, delivering 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced it with the SAI50X5 direct replacement, retaining identical mounting, force, and dimensions.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This non-magnet SKU cannot take a sensor, unlike CS1-B/DS1-B equipped units.
Airtac SI50 Standard Cylinder SI50X5 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X5 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X5 |
| Bore size | Ø50 mm |
| Stroke | 5 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 SAI50X5 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 SAI50X5 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 SI50X5
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×5 | 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 SI50X5 Is Used
Short-Stroke Clamping
Ideal for brief 5mm clamping actions in machining fixtures, providing 982N of push force at 0.5MPa.
Ejector Pins
Quickly eject small parts from automated assembly tooling with a fast 30-800mm/s cycle speed.
Light Pressing
Performs short-stroke light pressing or seating of components, safely handling a 589N working load.
Replacing the Airtac SI50 Standard Cylinder SI50X5 with the SAI50X5
To replace the SI50X5, order the SAI50X5 direct, confirming the ISO 15552 interface, 50mm bore, 5mm stroke, G1/4 port, and mounting accessory. Size both ways: a 40mm bore yields 628N push, while a 63mm bore yields 1559N. For load holding, note the cushion only decelerates; use a pilot check valve or SAIL/BSAI lock variant. This non-magnet SKU cannot accept a sensor.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X5
- ✓ 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 SI50X5 FAQ
Yes, the AirTAC SI50X5 is discontinued. The direct replacement is the SAI50X5, which shares the identical ISO 15552 mounting interface, 50mm bore, 5mm stroke, G1/4 port, and output force.
The 50mm bore uses a G1/4 port. Force ratings are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa.
Request a Quote for the SAI50X5
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X5 replacement — usually within 7-8 hours.