This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX600S, 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 SI50AX600S
The AirTAC Airtac SI50 Standard Cylinder SI50AX600S 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 SAI50AX600S, 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 → SAI50AX600S
- 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 SI50AX600S
The AirTAC SI50AX600S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 600mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa, features a G1/4 port, and includes a SUS420J2 stainless steel rod (-A) with a piston magnet (-S) for legacy CS1-B/DS1-B sensors. AirTAC replaced this EOL unit with the SAI50AX600S.
The SAI50AX600S is a direct replacement: identical ISO 15552 mounting interface, bore, stroke, force, and port. It upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life. Note the 600mm stroke requires external guides to prevent rod bending.
Airtac SI50 Standard Cylinder SI50AX600S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX600S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX600S |
| 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 SAI50AX600S 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 SAI50AX600S 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 SI50AX600S
| 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 SI50AX600S Is Used
Long-Stroke Diversion
Actuates routing gates on packaging lines over a 600mm span, utilizing the 50mm bore's 982 N push force at 0.5 MPa to shift heavy cardboard flats reliably.
Pallet Handling
Pushes pallets into strapping stations using the ISO 15552 mounting interface for rigid fixture attachment, relying on adjustable air cushions to decelerate the load at stroke end.
Replacing the Airtac SI50 Standard Cylinder SI50AX600S with the SAI50AX600S
To replace the SI50AX600S, order the SAI50AX600S. Confirm the ISO 15552 mounting interface, 50mm bore, 600mm stroke, G1/4 port, and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet enables current AirTAC switches (replacing legacy CS1-B/DS1-B), and the -A rod specifies SUS420J2 stainless steel. For sizing, this bore yields 982 N push at 0.5 MPa; if undersized, the 63mm bore provides 1559 N. Because the 600mm stroke is long, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX600S
- ✓ 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 SI50AX600S FAQ
Yes, the AirTAC SI50AX600S is discontinued and end-of-life. The direct replacement is the SAI50AX600S. It shares the identical ISO 15552 mounting interface, 50mm bore, 600mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly while upgrading the piston seal to two Y-shaped one-way elements for longer life and lower start-up pressure.
This double-acting cylinder has a 50mm bore, 600mm stroke, M16x1.5 rod thread, and a G1/4 air port. The adjustable air cushion is 30mm at each end, and the speed range is 30-800 mm/s. Force ratings 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 maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX600S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX600S replacement — usually within 7-8 hours.