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This blog post has been refreshed and updated on October 28th, 2019.

The most common type of Grub Screw is the DIN standard 916, and surprisingly, there’s a security version of it too.

If you have an application that would usually require socket setscrews, you may be interested to find out that we can supply the security version here at Fastenright as part of our Pin Hex range of security screws, offering an alternative for an application where there is a risk of tampering.

What is a Security Grub Screw?

The purpose of a grub or setscrew is to join two objects together.

First developed in the early part of the last century to improve safety by removing the need for a head on the screw. This stopped the head of the screw protruding, therefore reducing the potential for an accident, particularly when used on moving parts within machinery.

Now commonly used across the world, they often host a hexagonal recess enabling them to be tightened using a hex drive or insert bit. This type of drive allows for better torque and reduces the likelihood of the tool slipping out of the screw – as may be the case with a screwdriver.

Similar to other pinned screws in our range, Security Grub Screws are essentially a stainless steel socket setscrew modified by inserting a pin into the hex socket. The pin prevents a standard hex tool – such as an alen key – being used with the setscrew, as it stops the driver from being placed into the socket.

This means that a matching tool or bit with a hole for pin is required to fasten and perhaps, more importantly, remove the fixing!

Special bits and key wrenches are available when purchasing these screws.

security-grub-screw The standard security grub screw has a common cup point, conforming to DIN 916, but security versions of other points such as dog, flat and cone, can also be supplied.

More on these Tamper Proof Socket Set Screws

There are various other names which refer to the drive of security grub screw, these include Hex Pin, Tamper Pin Hex, Socket Screw with Pin and din 916 with Pin. It is a problem with the fastener industry that there are often several different names applied to the same fixing, but if you are unsure about what you are looking for you can always contact us.

We can offer this range of security grub screws in virtually any size that a standard socket setscrew is available in, with some sizes even available off-the-shelf.

There is more information on our security grub screws here and don’t forget if you need non-standard sizes or materials, these are available to order including small volume manufacture.