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Tri-Groove Tamper Proof Security Nuts Zamak 5 Zinc 1/4'-20 - Qty 25

4.5 (3) Write Review

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$46.40

$ 21 .99 $21.99

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About this item

High quality tamper proof security nuts
Tri Groove Security Nuts are made of Zamak 5 Zinc Alloy (95% Zinc, 4% Aluminum, 1% Copper). Zamak is an alloy of Zinc and Aluminium, sometimes also incorporating Magnesium and Copper.
The added copper in Zamak 5 increases the strength, hardness, and corrosion resistance of the alloy, but reduces its ductility and dimensional accuracy compared to other Zamak Alloys.
Tri Groove nuts are also referred to as T Groove, Trident Drive and Coned Trident Drive Nuts.
May only be installed and remove using tri groove or trident drivers or sockets - Sold Separately

Product Description

Tapered diameter resistant to gripping devices
Driven by three grooves on the outside of the nut
They are also known as Trident Drive Nuts, T-Groove Nuts, and Tri Groove Nuts
Installed using a special tri groove socket
Zamak 5 Zinc Alloy
Commonly used on boats, docks, piers and pools

Tri Groove security nuts feature a tapered diameter, making the nuts resistant to gripping devices. They are installed using a special Tri Groove socket, which grips the indentations along the outside of the fastener to turn the nut along a thread.

Tri Groove Nuts are commonly used with driver-less fasteners, such as carriage bolts or concrete anchors for a secure assembly. If the nut is not easily accessible, the fastener assembly will be harder to be tampered with. Security Nuts are commonly used in public outdoor applications including campsites, parks, playgrounds, benches, cars and roof top tents.

Tri Groove Security Nuts

Zamak 5 Zinc Alloy

Tamper Proof Nuts in this selection are made of zamak 5 zinc alloy. Zamac Zinc Alloy, a metal made of Zinc, Aluminum, Magnesium and Copper. Zamac Zinc alloy is designed to be durable and retain its strength and hardness over time, which adds to the benefits of tamper proof fasteners since they are suitable for long lasting applications.

Tamper Resistant Design

Tri Groove Nuts are circular and tapered making them extremely resistant to gripping devices. They require a special socket to grip the three indentations along the side of the nut to be installed.

Common Applications

Because of their tamper resistant design, Tri Groove Nuts are commonly used in public applications including campsites, parks, playgrounds, benches, cars and roof top tents.

A. W. Guthrie

Reviewed in the United States on January 19, 2023

A little difficult to use if you have never used them but, once you get the hang of handling them, they are well worth the price.

Robert Thomson

Reviewed in the United States on May 24, 2018

I was not happy when my employee discovered that she could loosen the tri-groove nuts with an pair of channel locks.

kwc5776

Reviewed in the United States on July 2, 2017

Four roll up doors on my new shop building had locks designed to be padlocked from the outside, ala storage unit doors. This would not work on a shop that would have thousands of dollars in automotive tools and equipment. So I moved the locks to the inside of the doors, but with the bolts welded to the lock plates, this left the nylon lock nuts on the outside of the building, easily removable by any would-be thief. These tri-groove nuts solved that problem perfectly. Highly unlikely that anyone getting through my security gate and making their way the 500 feet back to my shop would happen to have the matching tri-groove socket. The nuts may be expensive, but they are well worth the added security for my shop. I still think the $36+ price for the socket is ridiculous, though. Of course that could deter a thief from ordering an entire set of sockets to keep in their tool bag.

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