6405-12-16 O-Ring to Pipe, Male ORB x Female NPT Adapter

Product Overview

The 6405-12-16 Straight Adapter is an industrial fluid power fitting built to handle high-demand connections between a 1-1/16-12 Male O-Ring Boss (ORB) port and a 1-11 1/2 Female National Pipe Thread (NPT) line. Forged from heavy-duty steel, this inline adapter is designed specifically for medium- to high-flow hydraulic setups where standard ORB ports must transition safely into larger NPT piping networks.

The ORB interface utilizes a Male O-Ring Boss sealing system to provide a secure, pressure-tight, and mechanical barrier once fully torqued. On the opposite side, the NPT interface employs female tapered pipe threads that achieve a tight mechanical hold through thread interference. For peak leak resistance under high volume and pressure, it should be paired with a quality thread sealant or tape during installation.

Specifications

• Part Number: 6405-12-16
• Material: Steel
• Shape: Straight
• Thread 1 Type: Male O-Ring Boss (ORB)
• Thread 1 Size: 1 1/16-12 (-12)
• 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)