This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X300H, 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 SI50X300H
The AirTAC Airtac SI50 Standard Cylinder SI50X300H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X300H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X300H
- 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 SI50X300H
The AirTAC SI50X300H is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 300 mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa, features a G1/4 port, M16x1.5 rod thread, and uses a Viton H seal for 0-150 C high-temperature environments. The direct replacement is the SAI50X300H, matching the exact ISO 15552 mounting interface, force, and dimensions.
The SAI upgrade introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Because this specific SI SKU lacks a magnet (-S), it cannot accept a CS1-B or DS1-B sensor.
Airtac SI50 Standard Cylinder SI50X300H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X300H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X300H |
| Bore size | Ø50 mm |
| Stroke | 300 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 SAI50X300H 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 SAI50X300H 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 SI50X300H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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 SI50X300H Is Used
High-Temperature Ejection
Uses the Viton H seal to push parts out of heated molding zones, applying 982 N of force at 0.5 MPa over the 300 mm travel.
Long-Stroke Diverting
Actuates routing gates on packaging lines where the 300 mm extension requires external guides to prevent rod bending.
Replacing the Airtac SI50 Standard Cylinder SI50X300H with the SAI50X300H
To replace this cylinder, order the SAI50X300H. It is a direct per the ISO 15552 mounting interface, keeping the identical 50 mm bore, 300 mm stroke, G1/4 port, and Viton H high-temperature seal. If you need to scale up, the neighboring 63 mm bore provides 1559 N push at 0.5 MPa; scaling down, the 40 mm bore offers 628 N. Note that this no-magnet SKU cannot support a sensor. Because the 300 mm stroke invites rod bending under offset loads, use external guides to prevent side-load damage. Finally, a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X300H
- ✓ 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 SI50X300H FAQ
Yes, the SI50X300H is discontinued. The direct replacement is the SAI50X300H. It shares the same ISO 15552 mounting interface, 50 mm bore, 300 mm stroke, G1/4 port, and Viton H high-temp seal, fitting existing fixtures directly.
This double-acting cylinder has a G1/4 port and provides 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. It operates at speeds of 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X300H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X300H replacement — usually within 7-8 hours.