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Security Machine Screws Buying Guide

For regular (non-secure) machine screws, click here.


A security machine screwis a secure (tamper resistant or tamper proof) machine screw or "cap screw." Machine screws have a cylindrical shaft, threaded their entire length, and fit into a nut or a tapped hole.

Tanner Bolt & Nut offers three types of security machine screws, each available in different head styles.

Torx Security Machine Screwsare Tamper-Resistant cap screws that incorporate a solid post formed in the center of the recess during the heading process.

The fasteners are extremely difficult to remove without a special tamper-resistant tool.

Torx Tamper-Resistant screws have been used extensively to prevent unauthorized removal in correctional institutions, hospitals, elementary and secondary schools, colleges, universities, public places and retail stores.

Torx Tamper-Resistant cap screws are manufactured either from heat-treated alloy steel with zinc plating or 18.8 stainless steel.

Button Head Torx Tamper-Resistant Machine Screw

     Alloy Zinc Plated | Stainless Steel
Shop for Alloy Zinc Plated Torx Button Head Machine Screws

Shop for Stainless Steel Torx Button Head Machine Screws
Flat Head Torx Tamper-Resistant Machine Screw

     Alloy Zinc Plated | Stainless Steel
Shop for Alloy Zinc Plated Torx Flat Head Machine Screws

Shop for Stainless Steel Torx Flat Head Machine Screws

Torx Plus Tamper-Resistantmachine screws (cap screws) offer restricted access in the field along with the assembly benefits of the Torx Plus Drive.

The fivelobe design with a solid post in the center of the recess provides increased resistance to tampering. Limited access to the installation tools maintains the integrity of the system.

The cap screws are available in flat and button head, SAE 4037 alloy steel with a black finish and 302 stainless steel.

TorxPlus Machine Screws
Shop for
TorxPlus Machine Screws

Click the above link for these options:
  • Button Head
  • Flat Head
  • Alloy Steel Black
  • Stainless Steel
  • UC Stainless Steel
  • UC Alloy Steel Black

Trident Machine Screwsoffer a unique head design that makes removal extremely difficult. The Trident head is conical shaped with three notches around the perimeter. These machine screws (cap screws) are available in case hardened steel and are zinc plated.

Shop for Trident Machine Screws
Many sizes available