皿頭

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About 皿頭

Countersunk (flat head) screws have a 90 degree cone that sits flush with the surface — nothing protrudes to snag or interfere with a sliding face. Socket drive for torque, cross drive for cost.

Standards DIN 7991 · ISO 10642 · DIN 965 · ISO 7046

Black oxide alloy steel

High strength for machinery and dies.

304 stainless

Corrosion resistant, visible surfaces.

Zinc or nickel plated

Low cost or bright finish.

How to choose

• The countersink must be 90 degrees and deep enough or the head will not seat.
• The cone wedges outwards — watch for splitting in thin sheet or plastic.