Hex Bit Adapter 4mm to 6.35mm Screwdriver Converter Set

Switch between 4mm and 1/4" (6.35mm) screwdriver bits in seconds with this compact hex bit adapter set. Made from durable alloy steel, these adapters are ideal for electronics repair, DIY projects, and precision work on mobile phones, cameras, and computers. Available as a single adapter or a convenient two-piece set covering both conversion directions.

Key Features

• Dual Conversion: Includes a 4mm-to-6.35mm adapter AND a 6.35mm-to-4mm adapter — covers both conversion directions in one set.
• Magnetic Bit Hold: Built-in magnetic design keeps bits securely seated for confident, controlled driving without fumbling.
• Alloy Steel Construction: Tough, corrosion-resistant alloy steel withstands repeated use and everyday workshop demands.
• Versatile Compatibility: Fits standard 4mm and 1/4" (6.35mm) hex screwdriver chucks — works with most cordless drills, power screwdrivers, and manual bit holders.
• Wide Application: Perfect for repairing smartphones, tablets, cameras, laptops, and other precision electronics, as well as general household and workshop tasks.
• Compact & Lightweight: Small enough to toss in a toolkit pouch or apron pocket — always ready when you need it.

Specifications

• Material: Alloy Steel
• Color: Silver
• Sizes: 4mm × 6.35mm / 6.35mm × 4mm
• Magnetic: Yes (internal magnet for secure bit retention)
• Package Options: 1 pc (choose direction) or 1 set (both adapters)
• Country of Origin: Made in China

Package Contents

• Option A: 1 × Adapter Socket Sleeve (4mm to 6.35mm or 6.35mm to 4mm)
• Option B: 2 × Adapter Socket Sleeves (1 × 4mm to 6.35mm + 1 × 6.35mm to 4mm)

Note: Actual color may vary slightly from images due to monitor brightness and lighting conditions. Please allow a small tolerance (±0.5mm) in manual measurements.

For guidance on safe hand tool use and workplace practices, visit the OSHA Hand and Power Tools Safety page.

Frequently Asked Questions

Q: What is the difference between the 4mm-to-6.35mm and 6.35mm-to-4mm hex screwdriver adapters?

A: The 4mm-to-6.35mm adapter lets you use standard 1/4" (6.35mm) bits in a screwdriver or drill that accepts 4mm hex shanks. Conversely, the 6.35mm-to-4mm adapter lets you use 4mm bits in a tool with a standard 1/4" (6.35mm) chuck. Together they give you full two-way compatibility between these two common bit sizes.

Q: Are these adapters magnetic, and why does that matter?

A: Yes — both adapters feature an internal magnetic design that holds your screwdriver bit firmly in place. This prevents bits from dropping out during use, which is especially helpful when working in tight spaces on electronics, overhead fixtures, or any angle where gravity could dislodge a loose bit.

Q: What tools and applications are these hex bit adapters compatible with?

A: These adapters work with any cordless drill, power screwdriver, or manual bit holder that accepts either a 4mm or 1/4" (6.35mm) hex shank. They are commonly used for repairing mobile phones, cameras, computers, and other electronics, as well as general household assembly, furniture building, and workshop projects.

Q: What material are the adapters made from, and how durable are they?

A: The adapters are machined from alloy steel, which provides excellent hardness, toughness, and resistance to everyday wear. They are built to withstand the torque demands of both manual and power-driven screwdriving tasks in regular workshop or repair-shop conditions.