Holt SS A4 Countersunk Machine Screw

The Holt SS A4 Countersunk Machine Screws are premium fasteners made from A4 (marine-grade 316) stainless steel, ideal for flush mounting in marine environments. Based on this, these screws are pre-packed and available in metric sizes. Holt’s countersunk design allows the head to sit flush with the surface—perfect for deck hardware, cabinetry, and fittings where protruding screw heads are undesirable.

With excellent corrosion resistance and strength, these screws are well suited to coastal conditions and salt-laden air. They maintain structural integrity under exposure and help preserve the sleek, clean finish of your marine installations. Compatible with standard tool sets, the countersunk head also ensures smooth surfaces that reduce snagging and wear.

Features

• Made from A4 / 316 stainless steel for superior corrosion performance in marine settings
• Countersunk head design ensures flush installation and sleek finish
• Supplied in pre-packed sets for convenience
• Available in metric sizes
• Strong mechanical thread engagement for secure fastening
• Low maintenance - ideal for exposed marine use
• Suitable for deck fittings, cabinetry, hardware mounting
• Complements high-quality marine joinery and finishes

Specifications

• Material: A4 / 316 stainless steel
• Head Style: Countersunk (flush mount)
• Drive Type: Slotted