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Countersunk Head

Countersunk Head

Countersunk Head

Security Countersunk Machine Screws

Countersunk security machine screws sit flush with the surface and use a tamper-resistant drive so the fixing cannot be undone with a standard screwdriver. Used on panels, covers, public fittings and equipment where a clean flush finish and tamper resistance are both needed.

Drive and Size Range

Tamper-resistant drives including Pin Torx, Pin Hex, Tri-Wing, Spanner / Two-Hole and One-Way. Metric thread sizes across the common machine-screw range, in zinc-plated and stainless options. The matching driver bits are stocked in Security Bits.

Recommended Use

Use a countersunk head where the screw must finish flush, such as sliding panels, trim and walk-on surfaces. One-Way drives allow install but resist removal entirely; Pin Torx and Pin Hex allow authorised removal with the matching bit. Match the bit to the drive exactly to avoid stripping the recess.

Browse the full Security Machine Screws range, the wider Security Fasteners category, or see our Technical PDFs library for spec sheets.

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