This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX500, 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 SI50AX500
The AirTAC Airtac SI50 Standard Cylinder SI50AX500 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 500mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX500, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX500
- 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 SI50AX500
The AirTAC SI50AX500 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 500mm stroke. It delivers 982N push and 825N pull at 0.5MPa through a G1/4 port. The direct replacement is the SAI50AX500, which matches the interface, force, and mounting while upgrading the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. This SKU uses an SUS420J2 stainless steel rod (-A) for corrosion resistance.
Because it lacks the -S magnet option, this cylinder cannot accept legacy CS1-B or DS1-B sensors. Note that the SAI family also introduces SAIL, SAIF, and BSAI lock or valve variants that the SI line lacked.
Airtac SI50 Standard Cylinder SI50AX500 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX500 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX500 |
| Bore size | Ø50 mm |
| Stroke | 500 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 SAI50AX500 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 SAI50AX500 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 SI50AX500
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×500 | 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 SI50AX500 Is Used
Long-Stroke Diversion
Pushes packages across a 500mm transfer gap on a stainless-steel rod suited for washdown environments.
Guided Gate Actuation
Opens and closes heavy security gates over the full 500mm travel, requiring external load guides.
Replacing the Airtac SI50 Standard Cylinder SI50AX500 with the SAI50AX500
To replace the SI50AX500, order the SAI50AX500. Confirm the ISO 15552 mounting interface, 50mm bore, 500mm stroke, G1/4 port, and your specific mounting accessory. The -A suffix specifies the SUS420J2 stainless rod, and because this SKU has no -S magnet, it cannot support position sensing. Sizing both ways: a neighbouring 40mm bore yields 628N push at 0.5MPa, while a 63mm bore provides 1559N. At 500mm stroke, prevent rod bending by guiding the load externally to avoid side-load forces. The air cushion only decelerates the piston; it does not hold the load. For static holding on air loss, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX500
- ✓ 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 SI50AX500 FAQ
Yes, the SI50AX500 is discontinued. The direct replacement is the SAI50AX500. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 500mm stroke, 982N force, and G1/4 port, so it drops directly into existing fixtures.
The 50mm bore uses a G1/4 port. Theoretical forces are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a maximum of 200kgf at 1.0MPa. It features a 20mm rod, M16x1.5 thread, and 30mm cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX500
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX500 replacement — usually within 7-8 hours.