This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX500SH, 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 SI50AX500SH
The AirTAC SI50 Standard Cylinder SI50AX500SH 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 SAI50AX500SH, 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 → SAI50AX500SH
- 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 SI50AX500SH
The AirTAC SI50AX500SH is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 500mm stroke, G1/4 port, and Viton H high-temperature seals (0-150 C).
The direct replacement is the SAI50AX500SH, which shares the same interface, bore, stroke, force, and port. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. The SI50AX500SH features a SUS420J2 stainless rod and a piston magnet for legacy CS1-B/DS1-B sensors; the SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50AX500SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX500SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX500SH |
| 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 SAI50AX500SH 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 SAI50AX500SH 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 SI50AX500SH
| 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 SI50AX500SH Is Used
Hot Product Diversion
Actuates diverters on high-temperature conveyor lines, utilizing the Viton H seal and 500mm stroke to push heated packages safely.
Elevated Pallet Handling
Drives vertical lifting arms for pallet positioning, where the 50kg vertical lift capacity and SUS420J2 stainless rod resist moisture.
Automated Oven Doors
Opens and closes heavy industrial oven doors, relying on the 982 N push force and high-temp seals for reliable 500mm travel.
Replacing the Airtac SI50 Standard Cylinder SI50AX500SH with the SAI50AX500SH
To replace the SI50AX500SH, order the SAI50AX500SH. Verify the ISO 15552 mounting interface, 50mm bore, 500mm stroke, G1/4 port, and your mounting accessory. The -S magnet works with legacy CS1-B/DS1-B switches, while the SAI uses current AirTAC switches. The -A rod is SUS420J2 stainless, and the -H seal is Viton for 0-150 C. At 0.5 MPa it pushes 982 N; a neighbouring 63mm bore pushes 1559 N. For the 500mm stroke, use an external guide to prevent rod bending and side-load damage. A plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX500SH
- ✓ 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 SI50AX500SH FAQ
Yes, the SI50AX500SH is discontinued. The direct replacement is the SAI50AX500SH. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 500mm stroke, G1/4 port, and output force.
The bore is 50mm with a G1/4 air port. It pushes 982 N and pulls 825 N at 0.5 MPa, pushes 1374 N at 0.7 MPa, and has a theoretical max force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX500SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX500SH replacement — usually within 7-8 hours.