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When a Phillips is not a Phillips Plus So Much More!

Step 25Opsit® Security Screws

[[br]]Opsit® are a registered trademark of Tamperproof Screw Company, Inc. An interesting concept for tamperproof screws is the reverse thread sheet metal screw that installs counter-clockwise, thus, tightens if removal is attempted. Off-angled blades allow more insert torque than removal torque. Very tamperproof as the bit is not easily made. [[br]]

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1 comment

Mar 30, 2010. 10:32 AMDodgy says:

These are used in non-sheet metal applications too. I have seen them on a Kambrook 3-way powerboard & Sunbeam electric frypan controller. AFAIR, they weren't reverse thread.
BTW: great instructable!!