3/8-Inch Drive Extension Bar, 400mm Chrome Vanadium Steel

Brief Overview

This 400mm extension bar extends your reach for socket work in confined or deep-set fastening applications. Built from chrome vanadium steel with a mirror-polished finish, it pairs seamlessly with your existing 3/8-inch drive socket sets. The spring-loaded detent ball prevents socket dropout during use—a critical feature for overhead work. Whether you're working in engine bays, behind assemblies, or reaching recessed fasteners, this extension delivers the length professional shops need. For shorter reach applications or different drive sizes, consider a shorter 150mm extension or our larger 3/4-inch drive extension bar at 400mm.

Key Features

• 400mm Overall Length – Extends socket reach significantly beyond standard socket lengths
• 3/8" Drive Square Connection – Compatible with all standard 3/8-inch drive sockets and tools
• Chrome Vanadium Steel Construction – Provides durability and corrosion resistance in workshop conditions
• Polished Chrome Finish – Professional appearance and easy cleaning
• Spring-Loaded Detent Ball – Securely holds sockets in place, critical for vertical or overhead work
• Precision-Machined Shaft – Smooth cylindrical design ensures no binding or jamming

Business Advantages for Resellers

• High-Demand Item – Extension bars are consumable-adjacent tools with regular replacement needs as they wear or get lost
• Impulse Add-On – Customers purchasing socket sets naturally add extensions to their order
• Stack & Bundle Appeal – Pair with socket sets and ratchets for attractive multi-tool packages
• Professional Necessity – Every serious shop needs multiple extensions at different lengths; volume orders are common

Technical Specifications

Specification	Details
Drive Size	3/8-inch square
Overall Length	400mm
Material	Chrome Vanadium Steel
Finish	Polished Chrome
Connection Type	Female socket end / Male drive end with detent
Weight	Approximately 0.6 kg
Application	Socket wrench extensions for automotive, industrial, and maintenance work

Why This Length Matters

At 400mm, this extension bar bridges the gap between standard socket lengths and specialty deep-reach tools. It's ideal for:

• Accessing fasteners behind engine components
• Reaching into recessed areas without oversizing your tool selection
• Overhead or vertical work where socket retention is critical
• Heavy industrial assembly where length precision matters

The detent ball design ensures the socket stays secured during the work stroke—preventing the frustrating socket-dropout that occurs with cheaper, ball-less alternatives.

Close-Out Statement

Stock this extension in your 3/8-inch drive section as a high-velocity inventory piece. Professional shops typically maintain 2-3 different extension lengths; your customers will return for backups. The chrome vanadium construction ensures longevity that justifies margin on bulk orders.