What is the smallest hex key? - Project Sports
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What is the smallest hex key?

3 min read

Asked by: Dana Franklin

Sizes contained in the set are 0.71mm , 0.89mm (the two smallest hex keys in this set are metric) – then 1.27mm (0.05″), 1/16″; (1.59mm), 5/64″ (1.98mm), 3/32″ (2.38mm) and 7/64″ (2.79mm). Supplied in a handy plastic holder.

What is the smallest size hex key?

The smallest wrench, which is why I bought the set, is undersized and rounds out the inside of the allen screw. The smallest wrench is supposed to be . 028 but measures . 0253.

What sizes do hex keys come in?

What different sizes does an Allen key come in? You can get two types of hex key sets: standard key size and metric key size. Standard typically comes in 1/8 inch, 3/32 inch, 7/64 inch, 5/32 inch, 3/16 inch, ¼ inch, and 7/32 inch. Metric sizes most often come as 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, and 10 mm.

Is there a 5.5 Allen key?

In the United States, larger metric half sizes like 6.5 mm aren’t standard in most hex key sets.



SAE Substitutes for MM.

Imperial Hex Key Metric Hex Size
1/8″ 3.5 mm
5/32″ 4 mm
3/16″ 5 mm
7/32″ 5.5 mm & 6 mm

What can I use as a small Allen key?

Socket Wrench or Ratchet Wrench



If you have one that will fit in the hex screw hole or hexagonal socket you are working with, a socket wrench may come in handy in place of an Allen wrench.

Are there different size Allen keys?

In addition to the precision sizes mentioned above, the common metric Allen wrench sizes are 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 7 mm, 8 mm, 9 mm, & 10 mm. Of these sizes, some of the more popular ones are 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, & 10 mm.

What are tiny Allen wrenches used for?

An Allen key or Allen wrench is also known as Hex key. This is a small handheld tool used for turning bolts and screws which have hexagonal sockets. Many people assume that Allen keys are new, but to surprise, these tools are fairly old.

How do you remove a hex screw without a hex screwdriver?

How to Remove Allen Head Screws Without an Allen Head Screwdriver

  1. Try to find a standard screwdriver that fits snugly between two of the points of the screw. It should fit with no wiggle room. …
  2. Get your hacksaw. Put a small toothed blade on the saw. …
  3. Use a standard screwdriver that fits the groove you just made snugly.


Are hex bits and Allen keys the same?

A hex key, also known as an Allen key or Allen wrench, is a small handheld tool that’s used for for driving bolts and screws with a hexagonal socket. They are available in many different sizes, though they all have the same hexagonal-shaped tip. To learn more about hex keys and the benefits they offer, keep reading.

How do I make my socket wrench smaller?

Use a coin, or combination of coins, to fill the gap between the nut or bolt and the too-large wrench. – Try different combinations of coins to make the wrench as snug to the nut or bolt as possible, since the better the fit is the less likely the wrench is to slip off.

How do you tighten a bolt if you can’t reach the nut?

Just put a little bit right over the top and then as you press the socket on the tension in it is enough to just keep it in place. The same thing goes for nuts.