Channel Nuts – Everything You Need To Know

channel nuts

What are channel nuts? 

Channel nuts are used with channel support systems. The grooves along the edges act as small teeth that can lock onto the channel when tightened. Channel systems are designed for multiple applications, including supporting containment and pipe brackets for all types of electrical and mechanical installations and are a key part of making sure all the infrastructure stays together.

Types of Channel nuts

Channel Nuts are produced from steel bars because steel has high tensile strength, can be combined with other alloys and is resistant to a lot of corrosives. Channel nuts are rectangular with the ends shaped to allow a quarter turn crosswise in the framing slot after inserting through the opening in the channel and to prevent any further turning of the nut.

Two serrated grooves in the top of the nut engage the inturned edges of the channel and, after bolting is done, will prevent any lengthwise movement of the bolt and nut within the framing member.

For different applications, you need different types of nuts. All Armafix’s channel nuts are available in M6, M8, M10 and M12 (the number indicates the thread diameter). Find out below about the different variations of channel nuts for your application.

Plain Channel Nuts

Plain channel nuts are compatible with all types of unistrut channels. Plain generally suggests that the channel nut has no spring fitted or any other attachment. Armafix’s plain channel nuts are made from durable steel that keep costs low and strength/resistance high due to the availability/qualities of the material.

These steel channel nuts are suitable for use in dry environments and are fully resistant to most normal environmental factors. If you need something with added durability HDG (Hot-dipped Galvanised) channel nuts provide the best corrosion resistance for more taxing environments and improved longevity.

Short spring channel nuts

Short spring channel nuts are suited for 41 x 21 channels, either plain or slotted. They are inserted through the open side of the channel then rotated 90º where their toothed grooves slot in.

Short spring channel nuts are designed for use in 21mm deep channels. Spring channel nut versions can remain in position whereas plain channel nuts are pre–mounted on any bolt before insertion.

Long spring channel nuts

Long spring channel nuts are inserted through the open side of the channel then rotated through 90º where their toothed grooves fit against the channel. Long spring channel nuts are designed for use in 41mm deep channels.

Long spring channel nuts are available in steel, HDG or stainless steel variants for improved resistance in more difficult environments.

Hot-dip galvanizing provides full coating of edges, corners, and threads, higher coating densities, increased abrasion resistance, and greater bond strength to combat saline, industrial or chemical impact.

Stainless steel costs more initially but it has lasting value due to their durability. Stainless steel is easy to keep up because it rejects scratches and corrosions and it doesn’t need frequent cleaning, making it great for those out of reach applications such as channels.

channel fixings

How do you install channel nuts?

Sometimes installing channel nuts can be difficult. For spring channel nuts, the spring can sometimes get stuck or pop out of the slots. Because of this, we suggest paying more attention to pairing your channel nuts with the best-fitted channel support. For spring channel nuts, a plain channel can be used more efficiently as the spring can’t pop out through the gap.

To save yourself time and effort use channel nuts with square washers. They’re quick to install and great for overhead jobs. All you have to do is pop the channel nut into the channel, twist it 90º and you’re done. Available for M8 and M10 channel nuts, you can save time and money and make everything easier for yourself.

Channel nuts are easy to install with their rounded ends for easy insertion into and rotation within the strut. Rotating the channel nut 90° into place is simple and the serrated grooved edges will help keep it tight against the top of the strut, stopping unwanted movement or rotation.

After the first channel nut is inserted, place the fitting, and secure in place with a washer and hex bolt. Secure the second length of channel, and fasten in the same way.

ss fixings

Order Channel Nuts Online

Armafix’s selection of channel nuts ensures you get the fixing you need for the most secure fittings. We stock channel nuts and channel support systems for all light structural requirements, especially refined for the mechanical and electrical industry.

At Armafix, we know that you’re busy and that downtime is frustrating and not cost-effective. That’s why we respond rapidly to help you achieve more in your workday. We treat all our customers with the value they deserve and ensure your loyalty is rewarded. We aim to surpass your expectations every single time.

Need channel nuts for your next support system project? Call our knowledgeable team now on 0113 256 7211 or email


PEMSA: Best Cable Management Option?

Stainless Steel Cable Tray – What You Need to Know 

Threaded rod – everything you need to know

This article was written by Terry Harmer, Managing Director at Armafix, who has several years of experience of supplying quality fixings and support solutions for the building services industry.

Hassle-free service

Order fulfilment

Everyday. Everywhere.

Your expectations, everytime!