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Hex Bushing

Updated: 2026-07-22

Overview

The hexagonal threaded bushing is a small but essential component in piping systems, designed to adapt between different thread sizes. Its hexagonal shape allows for easy installation and removal using standard wrenches, making it a practical solution for plumbing, hydraulic, and pneumatic applications. These bushings are manufactured from robust materials like brass, stainless steel, or carbon steel to withstand various pressure and environmental conditions. They play a critical role in systems where different thread standards or sizes need to be connected securely and leak-proof.

Structure and Working Principle

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A hexagonal threaded bushing typically features female threads on both ends, with different sizes to accommodate the connection between mismatched male threads. The hexagonal middle section provides the necessary torque surface for installation. The working principle is straightforward: the bushing screws onto the larger threaded component first, then the smaller threaded component screws into the bushing. This creates a secure, pressure-resistant connection between two otherwise incompatible threaded parts.

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Key Features

The most distinctive feature is the hexagonal design which enables easy installation in tight spaces where a full wrench swing might be impossible. The six flat sides provide multiple gripping points for various wrench types. These bushings are available in different thread standards (NPT, BSPP, BSPT, etc.) and pressure ratings. High-quality versions include sealing features like tapered threads or O-ring grooves to prevent leaks in critical applications.

Application Areas

Hexagonal threaded bushings find extensive use in industrial piping systems, including water supply, gas lines, hydraulic systems, and chemical processing plants. They're particularly valuable in retrofit situations where new equipment must connect to existing piping. In the automotive sector, they're used in fuel and brake lines. For HVAC systems, these bushings help connect different components while allowing for easy disassembly during maintenance.

Maintenance and Precautions

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Regular inspection for thread wear and corrosion is recommended, especially in harsh environments. For critical applications, consider using thread sealant or Teflon tape to ensure leak-proof connections. When installing, avoid over-tightening as this can damage threads or distort the bushing. Always match the bushing material to the fluid being transported to prevent galvanic corrosion in the system.

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B2B Procurement Guide

When sourcing hexagonal threaded bushings, specify the exact thread sizes and standards required (e.g., 1/2" NPT to 3/8" NPT). Consider the pressure rating needed for your application and whether special materials or coatings are required. For bulk purchases, request material certifications and pressure test reports. Reputable manufacturers can provide custom machining for special thread combinations or non-standard sizes. Lead times for custom orders typically range from 2-4 weeks.

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