How to Make a Spanner Wrench – Step by Step Guide

A spanner wrench is a hand tool used for tightening or loosening bolts and nuts. It consists of a head with a perpendicular handle, and the head is designed to fit the specific shape of the bolt or nut.

Having a spanner wrench in your toolkit is essential for any DIY project or home repair. It allows you to easily fasten or loosen bolts and nuts and can save you time and frustration compared to using a hammer, chisel, or pliers.

In this comprehensive guide, we will walk you through the steps of making your own spanner wrench, from gathering materials and tools to shaping and finishing the wrench. After reading this guide, you will have the knowledge and skills to create a customized spanner wrench that fits your specific needs.

how to make a spanner wrench

How to make a spanner wrench – complete guide

Step: 01 – Gather Materials and Tools

To make a spanner wrench, you will need the following materials and tools:

Materials needed

Metal sheet or bar

You will need a piece of metal that is strong enough to withstand the torque of tightening and loosening bolts and nuts. Mild or alloy steel are good options, as they are durable and relatively easy to work with. You can purchase metal sheets or bars at a hardware store or online. Alternatively, you can use recycled metal, such as an old bike frame or car parts.

Wood or plastic

If you want to create a handle for your spanner wrench, you will need a piece of wood or plastic. Wood is a traditional choice, but plastic may be more comfortable to grip and less prone to splintering. You can purchase these materials at a hardware store or online or use recycled materials, such as an old broom handle or PVC pipe.

Tools needed

Metal saw

You will need a metal saw to cut your metal sheet or bar to the desired size and shape. It will also work if you use a hacksaw or a jigsaw with a cutting blade.

Hammer and anvil or vice

You will use a hammer and anvil or a vice to shape the wrench head. An anvil is a metal block with a flat surface that is used for forging or shaping metal, while a vice is a mechanical device that holds an object in place while it is being worked on.


If you make a handle for your spanner wrench, you will need a drill to create holes in the metal or wood.


You will use sandpaper to smooth the surface of your spanner wrench and remove any rough edges.

See Also: How to Use a Pin Spanner Wrench – Step by Step Guide

Step: 02 – Prepare the Metal

Before you can shape the wrench head, you need to prepare your metal sheet or bar. First, measure and mark the size and shape of the wrench head you want to create. You can use a ruler and pencil or a template, such as a drawing or a sample wrench.

Next, use your metal saw to cut the metal to size and shape. If you are using a hacksaw, you may need to make multiple passes to cut through the metal. When using a jigsaw, ensure to use a metal-cutting blade and clamp the metal securely to avoid accidents.

Once you have cut the metal to the desired size and shape, use sandpaper to smooth the edges and surfaces. This will make it easier to shape the wrench head and reduce the risk of cuts or abrasions.

Step: 03 – Finish the Wrench

Once you have completed the wrench head and handle, you will need to finish the wrench by sanding and smoothing it. Here are some tips to follow:

  • Sand the wrench: Use a fine grit sandpaper to smooth out any rough or uneven areas on the wrench. This will give the wrench a professional and polished look and will also make it easier to use.
  • Deburr the wrench: Use a deburring tool or a file to remove any burrs or sharp edges on the wrench. This will prevent injuries and make the wrench more comfortable to handle.
  • Polish the wrench: If you want to give the wrench a shiny and reflective finish, you can polish it using a buffing wheel and a metal polish. This will give the wrench a professional and high-quality look.

Step: 04 – Add a protective coating

After sanding and smoothing the wrench, you may want to add a protective coating to extend its lifespan and improve its appearance. Here are some options to consider:

  • Painting: You can paint the wrench using metal paint or enamel. This will give the wrench a colorful and decorative look and protect it from rust and wear.
  • Plating: You can plate the wrench using a process called electroplating. This involves applying a thin layer of metal (such as chrome or nickel) to the surface of the wrench using electricity. The plating will give the wrench a shiny and durable finish and will also protect it.
  • Oil or wax: You can also protect the wrench by applying a coat of oil or wax. This will work like a barrier against moisture and rust. It also helps lubricate the wrench’s moving parts.


In this comprehensive guide, we have shown you how to make your spanner wrench from scratch. We covered everything from gathering materials and tools to shaping the wrench head and handle to finishing and protecting the wrench. By following these steps, you can create your own customized spanner wrench tailored to your specific needs and preferences.

We hope this step-by-step guide will inspire you to try making your own spanner wrench at home. It is a rewarding and satisfying project that will save you money and give you a sense of accomplishment and pride.

Always use caution and proper safety measures when working with metal and tools. And once you have completed your spanner wrench, be sure to maintain and store it properly to keep it in good condition for years to come.

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