6405-20-16 O-Ring to Pipe, Male ORB x Female NPT Adapter

6405-20-16 O-Ring to Pipe, Male ORB × Female NPT Adapter

The 6405-20-16 O-Ring to Pipe (Male ORB × Female NPT Adapter) is a hydraulic fitting designed to connect a 1 5/8-12 Male ORB (-20) port to a 1-11 1/2 Female NPT (-16) pipe thread. Manufactured from high-strength steel, this straight adapter provides a durable and leak-resistant transition between ORB hydraulic systems and NPT pipe-threaded connections.

The ORB side uses an O-ring boss sealing system, ensuring a secure pressure-tight seal when properly torqued. The NPT side uses female tapered pipe threads, which seal through thread interference combined with thread sealant. This makes the fitting suitable for high-flow hydraulic applications where large ORB ports must be adapted to standard NPT piping systems.

Specifications

• Part Number: 6405-20-16
• Material: Steel
• Shape: Straight
• Thread 1 Type: Male O-Ring Boss (ORB)
• Thread 1 Size: 1 5/8-12 (-20)
• Thread 2 Type: Female National Pipe Thread (NPT)
• Thread 2 Size: 1-11 1/2 (-16)
• Sealing Type: O-ring (ORB side) + Thread sealant (NPT side)