How A Thread Checker Helps Identify Nuts And Bolts

VD August 08 2021

There are circumstances when you have to spend long hours being tucked away in your vehicle’s engine, only to face the distress of estimating the right size of your nut and bolt. When you maintain and service your vehicle on a regular basis, or when you are assembling your project build, then identifying what spare parts you need to complete your job can save a lot of time.

If you are exhausted from visiting the hardware store continuously and fed up with making assumptions about the nut and bolt's size, then it is the right time for you to buy a thread checker. These days, it is easy to obtain the right nut and bolt thread checker based on your demands.

Why Is It Important To Know Your Lug Nut Size?


It is important to know your lug nut size for a number of reasons. First, if you need to replace a lost or damaged lug nut, you will need to know the size in order to purchase the correct replacement. Secondly, lug nuts must be tightened to the proper torque specification, and this can vary depending on the size of the lug nut. Finally, some aftermarket wheels require specific sizes of lug nuts, so it is important to know what size lug nuts your vehicle uses in order to purchase the correct wheels.

In case you did not install the bolts, or you just want to make sure that the construction or repair of your car is going according to plan and check the size of your bolts - then a thread checker is perfect for you.

What is a thread checker, and how does it help to identify nuts and bolts?

A thread checker is made of string gauges that are collectively connected to a steel wire. Each scale of the nut and bolt thread checker features separate male and female threaded sections.

You attempt to screw an unidentified bolt into the female segment of the gauge with the help of a tool that is a size of a thread. It displays a match for the size marked on the gauge if the tool tends to suit, and if not, then you can make another attempt.

Classes of thread checkers

The nut and bolt thread checker has two basic variants. The first one is a wall-mounted thread and bolt checker, while the second one is based on a string, and it also has holders.

Wall-mounted thread checker


This variant can do a better job of checking the thread size of nuts, bolts, and screws that have not yet been implanted. This is the most helpful application of a thread checker that is mounted in your workshop.


Movable (portable) thread checker


This is the most reliable instrument for the purpose of mobile use and can be exceptional when a mechanic is working under the bonnet or in the body of the automobile and has to reach up and down. This cord-based nut and bolt thread checker has all the different sizes of bolts and threads, which shows the style of a necklace. This makes it relatively easier to reach the size of a bolt or a threaded plug when you want it.

Bottom Line

A thread checker is one of the most dependable and practical accessories for mechanics and hobbyists and most users found this tools to work very well for their purposes. In order to get the best out of this product, both the mounted as well as the portable versions can be used. When it is about arranging the workshop, the mounted version can be more valuable, whereas the mobile version can be great for on-project size checks.


How can you use a thread checker?

A thread checker is a set of gauges for both the standard and the metric threads and can be a great addition for anyone doing car service or repairs.

How to know if a thread is stripped?

When you screw a bolt into it, and it bites and tightens up properly, then you have the right thread pitch. On the other hand, if it won't bite or tighten, it means that the threads are damaged.

Why are the bolt threads so strong?

When in tension, the threaded fasteners are the strongest but not in shear. Because of this, parts are prevented from sliding relative to each other by the clamping force, while the body of the fastener acts like a pin.