When you begin to look around at different applications, you’ll see how ubiquitous hex keys are. Not only are they used to assemble flat-packed furniture from your favorite Swedish furniture store, but they’re all over other industries. They’re common in cycling and other sports, and especially common in automotive.

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On the long stem, you might find a flat or straight end, or it could be a rounded ball shape with six sides, Because a fastener might not be perfectly accessible, the ball end can make it easier to insert the hex key at an angle while still being able to turn it. Usually the ball end is only used when the fastener has barely any resistance, but under higher torque, it can skip or strip the fastener.

Aspheric lenses have much lower f-numbers, allowing them to perform better than spherical lenses in light collection, projection, illumination, detection and condensing applications. Since the focal lengths are often very short, compact designs are frequently possible. Precision polished aspheric lenses are computer-optimized to achieve diffraction limited performance over high NAs and are available uncoated or with broadband visible or broadband NIR antireflection coatings. For more economic or OEM applications, our aspheric condenser lenses are fabricated from Schott B 270® glass and are available uncoated or with a single-layer MgF2 antireflection coating. If small diameter lenses are required, our molded glass aspheric lenses with visible or NIR antireflection coatings are available mounted in a stainless steel threaded holder or unmounted. Aspheric objective lenses are also available that offer the same magnification and on-axis performance as microscope objectives in a more compact package.

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Seldom will you find a hex key available as an individual too. Instead, they’re sold as a set of approximately seven to 12 pieces of various sizes, either in metric or SAE. Typically, you’ll find that older cars and domestic models will use SAE sizes while European or Asian models will use metric.

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However, despite the varieties, the six-sided L-shaped tool is the only one that can truly claim the name of hex key – or Allen key, if you prefer.

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Step 1: Find the right one. What size hex key do I need? Fasteners are a certain size, whether metric or SAE, and the proper hex key will fit snugly. If the key can wiggle side to side without moving the fastener, it’s too small and could strip it, so look at the next size up or a comparable one in the other sizing convention.

Aspheric lenses have much lower f-numbers, allowing them to perform better than spherical lenses in light collection, projection, illumination, detection and condensing applications. Since the focal lengths are often very short, compact designs are frequently possible. Precision polished aspheric lenses are computer-optimized to achieve diffraction limited performance over high NAs and are available uncoated or with broadband visible or broadband NIR antireflection coatings. For more economic or OEM applications, our aspheric condenser lenses are fabricated from Schott B 270® glass and are available uncoated or with a single-layer MgF2 antireflection coating. If small diameter lenses are required, our molded glass aspheric lenses with visible or NIR antireflection coatings are available mounted in a stainless steel threaded holder or unmounted. Aspheric objective lenses are also available that offer the same magnification and on-axis performance as microscope objectives in a more compact package.

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Are these hand tools or screwdriver bits different, or are they the same tool? Here’s what you need to know about them, how to use them, and different types of hex keys or Allen wrenches.

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A single hex key looks like a capitalized ‘L’ with one short section perpendicular to a long section of the same size, shape, and thickness. From one end to the other, they’re six-sided. They’re manual tools, and either end of the L can be used to turn the fastener.

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FREE Loan-A-Tool® program requires returnable deposit. Please note that the tool that you receive after placing an online order may be in a used but operable condition due to the nature of the Loan-A-Tool® program.

Be sure to consult your owner’s manual, a repair guide, an AutoZoner at a store near you, or a licensed, professional mechanic for vehicle-specific repair information. Refer to the service manual for specific diagnostic, repair and tool information for your particular vehicle. Always chock your wheels prior to lifting a vehicle. Always disconnect the negative battery cable before servicing an electrical application on the vehicle to protect its electrical circuits in the event that a wire is accidentally pierced or grounded. Use caution when working with automotive batteries. Sulfuric acid is caustic and can burn clothing and skin or cause blindness. Always wear gloves and safety glasses and other personal protection equipment, and work in a well-ventilated area. Should electrolyte get on your body or clothing, neutralize it immediately with a solution of baking soda and water. Do not wear ties or loose clothing when working on your vehicle.

Why the terminology differences? It’s really quite simple. The broad term for this type of tool, hex key, is because of its shape. The Greek word ‘hex’ means six, which describes the six sides, or hexagonal shape, of this set of tools perfectly. The term ‘key’ also is simply sensible as the tool fits into a fastener, much like a key fits into a lock, and only the correct one will work.

The name Allen key came from an early 1900s inventor who patented a cold drawing process for manufacturing set screws that required hex keys. The term ‘Allen key’ stuck, and even though it’s technically a trademarked name, other manufacturers use the term for their tools.

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If you’re stocking your toolbox with common items you’ll need around the garage, you already know the importance of screwdrivers, wrenches, ratchets, and socket sets. Some screws need different types of tools to loosen or tighten them, and odds are that you’ve used them before. Hex keys or Allen wrenches. Are these hand tools or screwdriver bits different, or are they the same tool? Here’s what you need to know about them, how to use them, and different types of hex keys or Allen wrenches.

Advice, how-to guides, and car care information featured on AutoZone.com and AutoZone Advice & How-To’s are presented as helpful resources for general maintenance and automotive repairs from a general perspective only and should be used at your own risk. Information is accurate and true to the best of AutoZone’s knowledge, however, there may be omissions, errors or mistakes.

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Step 2: Insert the hex key into the screw head with the handle at 90 degrees. The key should always be used at 90 degrees to ensure it doesn’t skip or strip in the fastener, and it distributes force evenly across six points of contact.

Step 3: Rotate the hex key carefully. Hex fasteners aren’t intended for high-torque applications as they’re easy to strip. If you can’t break the fastener loose with manual power alone, lubricate it with penetrating fluid or apply heat or cold to help.

Whatever tools you’re after, AutoZone has from you, and that includes hex keys. Buy online or in-store for a massive selection of tools from top name brands like Duralast.

If you’re stocking your toolbox with common items you’ll need around the garage, you already know the importance of screwdrivers, wrenches, ratchets, and socket sets. Some screws need different types of tools to loosen or tighten them, and odds are that you’ve used them before. Hex keys or Allen wrenches.

Try applying penetrating oil, using a heat source like a hairdryer, tapping the screw lightly with a hammer, or using a screw extractor tool if necessary.

Objectives are also called object lenses, object glasses, or objective glasses. Several objective lenses on a microscope. Objective lenses of binoculars ...

When you have a fastener with a six-sided opening in it, you could pull out an Allen wrench set… or you could also pull out a hex key set. The difference between the two comes down to terminology only. There’s no debate about which is better, hex key vs Allen key, because they two names for the same type of tool.