Black Oxide Cap Head Security Screws, Pin‑Torx / Pin‑in‑Hex Tamper‑Proof Machine Screws

Black oxide cap head security screws are tamper‑proof machine‑thread fasteners designed to block unauthorized disassembly. Featured with cap‑head profile and special tamper‑resistant drive (pin‑torx / pin‑in‑hex), these security screws can only be installed & removed by dedicated matching bits. Black‑oxide finish delivers matte‑black appearance and basic indoor rust resistance. Widely adopted for public‑access hardware, equipment enclosures and anti‑vandal assembly projects.

Tamper‑Resistant Special Drive Structure

Built‑in security pin inside the drive cavity prevents operation with common household screwdrivers or allen keys. Only exclusive special tool bits work for mounting and removal, effectively stopping man‑made vandalism, theft and unauthorized tampering on exposed devices.

Cap‑Head Cylindrical Profile

Smooth cylindrical cap‑head fits counter‑bore holes for flush installation, no protruding edges. It saves internal installation space and avoids mechanical interference with surrounding moving parts for compact‑structure devices.

Black‑Oxide Surface Treatment

Ultra‑thin conversion coating will not alter thread dimensions to guarantee precise thread fit. Matte‑black non‑reflective look matches dark‑colored equipment housings. It merely provides rust‑proof performance for dry indoor environment.

Important note: Black‑oxide finish is NOT suitable for outdoor, high‑humidity or coastal working conditions.

Stable Mechanical Performance

Carbon‑steel raw material in Grade 4.8 / 8.8 supplies reliable clamping force. Precision‑rolled threads maintain stable meshing performance under repeated assembly and disassembly cycles.

1. Public‑access facilities: Playground hardware, kiosk cabinet, public‑area safety guard assembly
2. Electrical & electronic hardware: Charging‑pile housing, control cabinet, access panel anti‑tamper fixing
3. Security‑related equipment: Monitoring housing, vending machine, safety‑protection hardware
4. Indoor industrial devices: Exposed assemblies requiring restriction on random disassembly
5. OEM end‑product: Customer‑accessible modules with anti‑theft requirements

Tip: Select zinc‑plated security screws for humid or condensate‑prone working sites.

YH Fastener produces security screws via cold‑forging and thread‑rolling process. Each production batch undertakes hardness inspection, thread dimension testing and drive‑structure visual check. ISO 9001 quality‑management system is implemented to guarantee consistent bulk‑order quality.