Security screw (pin-in-Torx and friends)
No formal standard - security drives built onto normal heads (ISO 7045, DIN 965 etc.)
Sizes
M2-M10 metric, #4 to 3/8 in
Drive & head
Six-lobe with a centre pin, tri-wing, spanner (snake eye) or one-way
Materials
Steel, A2/A4 stainless
Strength / grades
Same as the underlying screw type
Hole and pilot guidance
Same holes as the machine or self-tapping screw the security head is built onto.
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Where it is used
Public and institutional panels
Control panels in schools, hospitals and transport, to stop casual tampering
View sourceConsumer electronics housings
Keeps users out of sealed devices and warranty-marked assemblies
View sourceWatch out for
- No matching bit means no clean way in - drilling it out is the fallback.
- Far fewer sizes, heads and materials are available than for normal drives.
- Pin heights vary between suppliers, so a cheap bit may not seat fully.