This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X325, 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 SI50X325
The AirTAC Airtac SI50 Standard Cylinder SI50X325 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 325mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X325, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke325 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X325
- 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 SI50X325
The AirTAC SI50X325 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 325 mm stroke, delivering 982 N push force at 0.5 MPa. AirTAC replaced it with the SAI50X325, a direct upgrade retaining the exact ISO 15552 mounting interface, G1/4 port, and M16x1.5 rod thread. This SKU lacks the -S magnet, so it cannot accept a CS1-B or DS1-B sensor.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. If higher temperatures are needed, Viton H seals raise the limit to 150 C.
Airtac SI50 Standard Cylinder SI50X325 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X325 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X325 |
| Bore size | Ø50 mm |
| Stroke | 325 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 SAI50X325 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 SAI50X325 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 SI50X325
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×325 | 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 SI50X325 Is Used
Package Diversion
Pushes medium-weight cartons off a main belt line using a 325 mm reach, relying on the 982 N thrust at 0.5 MPa.
Pallet Stop Gate
Acts as a pneumatic stopper for pallets entering a wrap station, safely handling the 50 kg vertical lift capacity.
Component Transfer
Shifts workpieces laterally between machining cells, utilizing the full 325 mm stroke with external guide support.
Replacing the Airtac SI50 Standard Cylinder SI50X325 with the SAI50X325
To replace the SI50X325, order the SAI50X325 keeping the identical 50 mm bore, 325 mm stroke, G1/4 port, and ISO 15552 mounting accessories. Because this 325 mm stroke exceeds 300 mm, use external guides to prevent rod bending and side-load damage. For higher force, the neighboring 63 mm bore offers 1559 N push at 0.5 MPa; for less force, the 40 mm bore gives 628 N. This non-magnet SKU cannot hold a load without live air—the cushion only decelerates. For load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X325
- ✓ 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 SI50X325 FAQ
Yes, the SI50X325 is discontinued. The direct replacement is the SAI50X325, which shares the identical ISO 15552 mounting interface, 50 mm bore, 325 mm stroke, output force, G1/4 port, and mounting accessories.
The 50 mm bore features a G1/4 air port and M16x1.5 rod thread. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical max of 200 kgf at 1.0 MPa.
Request a Quote for the SAI50X325
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X325 replacement — usually within 7-8 hours.