Security Screw
Screws · tamper-resistant screw · torx pin screw · one-way screw · security torx
Definition: A security screw uses a specialized drive — a pin-in-Torx, one-way slots, or an unusual shape — that needs a matching driver bit, deterring casual tampering and theft.
Anatomy
■ Head■ Shank■ Threads■ Point
Governing standards: Manufacturer specified (no universal standard)
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| #6-32 | M3.5 | pan/torx | 1/4–1 |
| #8-32 | M4 | pan/torx | 3/8–1-1/4 |
| #10-24 | M5 | pan/torx | 1/2–1-1/2 |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Steel | zinc-plated steel | — | None |
| Stainless | 304 stainless | — | None |
Materials
- Zinc-plated steel
- Stainless steel
- Brass
Pros & Cons
Pros
- Deters casual tampering and theft
- Standard sizes and threads
- Cheap insurance on public fixtures
Cons
- The matching bits are easy to buy — not true security
- No substitute bit in an emergency
- Round heads cannot be removed without the right tool
Typical Uses
- Public restrooms and fixtures
- Signs and plaques
- Electronics enclosures
- Vandal-prone equipment
Alternatives & Related
- Machine Screw — Standard drive where tamper resistance is not needed
- Socket Head Cap Screw — Stronger and reusable with a common hex key
Where to Buy
Affiliate links — we may earn a commission at no cost to you.
FAQ
Are security screws actually secure?
They deter casual tampering, but the driver bits are widely available, so a determined person with tools can remove them. Treat them as theft resistance, not locks.
What are the common security drives?
Pin-in-Torx (most common), pin-in-hex, one-way slotted, tri-wing, spanner, and pentalobe. Match the bit to the screw before ordering.