The Stanley STMT86407-8B 1/2 Inch Drive 5 Inch (125mm) Extension Bar is a professional-grade socket accessory designed to extend the reach of ratchets, socket wrenches, and breaker bars, allowing users to access deep, recessed, and hard-to-reach fasteners with ease. Manufactured from premium Chrome Vanadium (Cr-V) steel, this extension bar delivers high strength, exceptional durability, and excellent resistance to wear and corrosion, making it ideal for demanding workshop and industrial applications.

The extension bar features a 1/2 inch square drive with a secure ball-detent locking mechanism, ensuring sockets remain firmly attached during operation. Its fully polished chrome finish provides superior rust resistance while allowing easy cleaning after use. Designed for manual operation, the extension bar meets ASME B107.10M, ISO 3316, DIN 3123, and ISO 1174-1 standards, ensuring reliable performance and professional quality.

With an overall length of 125mm (5 inches), the Stanley STMT86407-8B is ideal for reaching bolts and nuts located inside engine compartments, machinery, equipment housings, and confined spaces. It is widely used by professional mechanics, automotive technicians, industrial maintenance personnel, and DIY enthusiasts for everyday fastening and repair tasks.

Product Features

Manufactured from premium Chrome Vanadium (Cr-V) steel for superior durability.
1/2 Inch square drive compatible with standard sockets and ratchets.
125mm (5 Inch) extension length provides greater access to recessed fasteners.
Fully polished chrome finish resists corrosion and rust.
Ball-detent locking system securely retains sockets during use.
Designed for manual operation with ratchets, breaker bars, and sliding T-handles.
Precision-machined square drive ensures accurate socket engagement.
Ideal for accessing tight, narrow, and hard-to-reach locations.
Suitable for automotive servicing, machinery maintenance, industrial repairs, and workshop applications.
Manufactured to ASME B107.10M, ISO 3316, DIN 3123 & ISO 1174-1 standards.

Specifications

Brand: Stanley
Model: STMT86407-8B
Product Type: Extension Bar
Drive Size: 1/2 Inch Square Drive
Length: 125 mm (5 Inch)
Material: Chrome Vanadium (Cr-V) Steel
Finish: Fully Polished Chrome
Operation: Manual
Socket Retention: Ball Detent
Standards: ASME B107.10M, ISO 3316, DIN 3123, ISO 1174-1
Application: Automotive, Mechanical, Industrial & Workshop Maintenance
Compatible With: Ratchets, Breaker Bars, Socket Wrenches & Sliding T-Handles

Stanley 1/2 Inch Drive 5 Inch (125mm) Extension Bar STMT86407-8B | Automotive, Garage, Workshop, Repair & Maintenance Applications

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