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How to Choose the Right Hex Bit Set

Por GlobalDX 15 Jan 2024
Hex bits, also known as Allen keys or Allen wrenches, are extremely useful for working with hex socket screw heads. For DIYers, auto repair, bike repair and other applications, it's handy to have a set of hex bits in different sizes. Here's what to look for when choosing the right hex bit set for your needs.

Metric vs. SAE Sizes

Hex bits come in standard metric and SAE (Society of Automotive Engineers) sizes. Metric sizes are measured in mm, while SAE sizes use fractions of an inch. Many sets include both metric and SAE bits, as both standards are common. For auto repair, having both metric and SAE is recommended.

Common Metric Sizes: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm

Common SAE Sizes: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4"

Most sets will include the sizes mentioned above. Some sets go up to larger bit sizes like 8mm, 10mm or 3/8" for working with larger hardware. Know the size of the hex fasteners you'll be working with most often when choosing a set.

Bit Length

Hex bit length ranges from about 25mm (1 inch) to over 100mm (4 inches). Shorter bits are good for precision work in tight spaces, while longer bits provide more reach and torque for applications like automobile repair. Sets typically include a range of lengths like 25mm, 50mm, and 100mm bits.

Bit Type

There are a few common types of hex bit tips:

Standard - The basic hex shape. Works for most applications.

Ball End - Rounded tip allows use at an angle. Good for tight spots.

Extra Long - For reaching fasteners deep in recesses.

T-Handle - Easier grip and torque. Good for larger fasteners.

Storage Options

Hex bit sets come in a few storage options:

Plastic case - Holds bits neatly in labeled slots. Not great for portability.

Folding pouch - Made of durable material with pockets for each bit. Compact.

Magnetic holder - Holds bits via strong magnets. Very portable but can lose bits.

Individual bit packs - Sets that contain multiple small plastic packs with 1-2 bits each. Handy to toss in a toolbox.

For convenience, look for a set that keeps bits securely organized but is still easy to carry around.

Brand & Build Quality

As with any hand tool, hex bit sets range widely in terms of durability and longevity. Cheap sets made with inferior steel can easily round off or break under torque. Invest in a reputable brand known for quality like Facoow, Wera, Bondhus, Milwaukee, Gearwrench, etc. Check that the bits have a chamfered tip and clean machining. With proper care, a high quality hex bit set should last for years of regular use.

The right hex bit set with an assortment of metric and SAE sizes, lengths and tip types will enable you to efficiently handle hex fasteners for any DIY project or repair job. Carefully considering the factors above will ensure you choose a set that meets your needs and lasts.
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