6405-16-08 O-Ring to Pipe, Male ORB x Female NPT Adapter

Product Overview

The 6405-16-08 Straight Adapter is an industrial fluid power fitting designed to establish a highly durable connection between a 1-5/16-12 Male O-Ring Boss (ORB) port and a 1/2-14 Female National Pipe Thread (NPT) line. Forged from high-strength steel, this inline adapter provides a reliable, pressure-optimized transition when integrating heavy-duty SAE ORB hydraulic networks with standard NPT plumbing components.

Sealing Technology

The ORB interface utilizes a precision mechanical Male O-Ring Boss sealing system to provide an airtight, leak-resistant barrier once fully torqued to specification. On the opposite side, the NPT connection features female tapered pipe threads that lock tightly using mechanical thread interference. To guarantee maximum leak-proof protection under constant system pressure, it should be paired with a high-quality thread sealant compound or tape during installation.

Specifications

• Part Number: 6405-16-08
• Material: Steel
• Shape: Straight
• Thread 1 Type: Male O-Ring Boss (ORB)
• Thread 1 Size: 1 5/16-12 (-16)
• Thread 2 Type: Female National Pipe Thread (NPT)
• Thread 2 Size: 1/2-14 (-08)
• Sealing Type: O-ring (ORB side) + Thread sealant (NPT side)