This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X640, 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 SI50X640
The AirTAC SI50 Standard Cylinder SI50X640 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 640mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X640, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke640 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X640
- 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 SI50X640
The AirTAC SI50X640 is a discontinued double-acting ISO 15552 profile cylinder. Delivering 982 N push force at 0.5 MPa through a 50 mm bore and 640 mm stroke, it is superseded by the SAI50X640. This direct replacement shares the exact ISO 15552 mounting interface, G1/4 port, and M16x1.5 rod thread, fitting existing fixtures perfectly.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot accept CS1-B or DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X640 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X640 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X640 |
| Bore size | Ø50 mm |
| Stroke | 640 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 SAI50X640 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 SAI50X640 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 SI50X640
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×640 | 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 SI50X640 Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the 640 mm travel, relying on the 982 N thrust at 0.5 MPa to overcome friction.
Pallet Stopper Gate
Acts as a 50 mm bore physical barrier on roller conveyors, dropping into standard ISO 15552 foot mounts for easy retrofitting.
Replacing the Airtac SI50 Standard Cylinder SI50X640 with the SAI50X640
To replace the SI50X640, order the SAI50X640. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), G1/4 port, and M16x1.5 rod thread. This non-magnet SKU cannot take a sensor; if sensing is needed, specify an SAI50X640S. The 640 mm stroke demands external guides to prevent rod bending and side loads. At 0.5 MPa it yields 982 N push (825 N pull); if undersized, the 63 mm bore offers 1559 N. The cushion only decelerates; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X640
- ✓ 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 SI50X640 FAQ
Yes, the AirTAC SI50X640 is discontinued. The direct replacement is the SAI50X640. It shares the identical ISO 15552 mounting interface, 50 mm bore, 640 mm stroke, output force, G1/4 port, and accessories, fitting directly into your existing fixtures.
The bore is 50 mm with a G1/4 air port and M16x1.5 rod thread. At 0.5 MPa it provides 982 N push and 825 N pull force. 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.
Request a Quote for the SAI50X640
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X640 replacement — usually within 7-8 hours.