This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X600S, 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 SI50X600S
The AirTAC Airtac SI50 Standard Cylinder SI50X600S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 600mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X600S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke600 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X600S
- 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 SI50X600S
The AirTAC SI50X600S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 600mm stroke. Delivering 982 N push at 0.5 MPa through a G1/4 port, it is replaced by the SAI50X600S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke and force, fitting existing fixtures perfectly.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF and BSAI variants the SI lacked. With a 600mm stroke, use external guides to prevent rod bending. The -S magnet works with CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X600S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X600S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X600S |
| Bore size | Ø50 mm |
| Stroke | 600 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 SAI50X600S 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 SAI50X600S 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 SI50X600S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×600 | 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 SI50X600S Is Used
Long-Stroke Material Transfer
Drives goods between processing stations over a 600mm reach where the 982 N push force at 0.5 MPa easily overcomes carriage friction.
Multi-Stage Ejection
Pushes completed parts out of a machining zone, requiring external guide rails to support the rod over the extended 600mm length.
Replacing the Airtac SI50 Standard Cylinder SI50X600S with the SAI50X600S
To replace the SI50X600S, order the SAI50X600S. Confirm the ISO 15552 interface, 50mm bore, 600mm stroke, G1/4 port (PT/G/NPT) and mounting accessory. The -S magnet enables CS1-B/DS1-B switches (the SAI uses current AirTAC switches). For sizing both ways: a 40mm bore gives 628 N push @0.5 MPa, while a 63mm bore yields 1559 N. At 600mm, add external guides to manage side-load and rod-bending. Note: plain cylinders drift on air loss; the cushion only decelerates. For held loads, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X600S
- ✓ 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 SI50X600S FAQ
Yes, the SI50X600S is discontinued. The direct replacement is the AirTAC SAI50X600S. It shares the same ISO 15552 mounting interface, 50mm bore, 600mm stroke, output force, G1/4 port and accessories, fitting directly into existing fixtures.
This double-acting cylinder has a G1/4 port. The thrust figures are: 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. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X600S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X600S replacement — usually within 7-8 hours.