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Permanent Fastener Types

What are permanent fasteners

Permanent fasteners provide a more or less immovable solution. Once they are in place, they cannot be removed, even by the person who initially installed them, without causing damage to the application.

Permanent screws are also referred to as “one-way screws” as most feature a head which is designed to turn one-way only, so they can be screwed into place, but can’t be unscrewed.

Some applications, such as park statues or benches, are designed to stay in place for the enjoyment of everyone, so permanent fasteners or fixings are typically used here, to prevent tampering or removal.

Permanent security screws are also used to secure vehicle number plates, as they make it virtually impossible to remove the plate without damaging it.

Permanent Fastener types

Some permanent fasteners have non-standard drive heads and require special tools to install them, other permanent screws can be installed with standard screwdrivers or tool bits.
Premium permanent fasteners often have a unique head design, shaped without any sharp angles, so that they can’t be gripped by pliers. These typically require special installation tools, for hand and power tool fixing.
Shear bolts are a different type of permanent fastener. They feature a hexagonal shaped section, which is used to fix the bolt into place, and which snaps off when fully tightened, leaving a smooth head offering no grip for a spanner or removal tool.

Permanent Fastener Examples

Clutch Head Security Screws

These can be installed with a standard slotted screwdriver. They feature a chamfer at either end of the drive, which means that they can only be screwed in a clockwise direction. If you try to unscrew them, the screwdriver just slips out.
Various types of clutch head permanent security screws are available, including self-tapping screws and machine screws.
See all clutch head permanent screws here.

Sentinel Security Screws

Sentinel Screws are permanent fasteners that can be installed with a standard cross head or Pozi Drive screwdriver or power driver, so they are quick to install and ideal for large volume use. The unique shape of the drive prevents it from being turned anti-clockwise, so they cannot be unscrewed.
See Sentinel Screws here.

Kinmar Permanent Security Fasteners

Kinmar permanent fasteners have a unique design with indentations in the head. A special security tool is required to fasten and tighten the fixing, and this is designed to fit hand and power tools for fast efficient installation. Kinmar permanent nuts, bolts and sleeve anchors are premium fixings, providing high torque and leaving no un-plated surfaces. Reusable fasteners are also available. Should the fastener become loosened due to vibration, it can be retightened using the tool.
See all Kinmar Security Fasteners here.

Security Wave Nuts

Security Wave Nuts also feature a unique head, with varying angles and radii in a wave design. They require a special driver tool to install. Often supplied as reusable fixings, a permanent version is also available. Steel Security Wave Nuts can be supplied case hardened, which provides additional torque and helps to prevent hack-sawing or chiselling.
See security wave nuts.

Shear Snap-off Fasteners

Snap-off fasteners work in a different way. They are fastened using a standard spanner and, when fully tightened, the hexagon portion attached to the head shears off, leaving a plain head with no drive. These are available in a range of head types and offer a very robust solution for prisons, banks and other secure environments. They are also used in the automotive industry.
See all Shear Snap Off Fasteners here.

No-Go Security Enclosures

As the name suggests, NoGo Enclosures are used to enclose standard nuts or hex bolts. The fixing is installed through the NoGo base, and the cap is then hammered into place, to form an impenetrable cover. NoGo fixings are case hardened to prevent attack from chisels, hacksaws and other tools, and also to absorb hammer blows.
See more information about NoGo Fixings here.

How to choose the best permanent fastener

It all depends on the application, and you’ll probably want to consider the degree of “permanency” needed, volumes and installation methods, cost and appearance, amongst other things.
The Fastenright team is here to help. Tell us what you need to secure and we can discuss the options with you. And, whilst we have a wide range of permanent fasteners in stock, we can also manufacture non-standard sizes or bespoke options.

See all one-way permanent fasteners HERE


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