Slotted Countersunk Head Screws

The Slotted Countersunk Head Screw (also known as a flat head slotted screw) by DONGSHAO is engineered for applications where a flush surface finish is required. The $90^{\circ}$ countersunk head sinks perfectly into pre-drilled bevels, ensuring that the head does not protrude, reducing safety hazards and offering a sleek, streamlined appearance.

Key Quality Features:

Flawless Surface Integrity: Our production line utilizes strict sorting systems to ensure zero burrs, no corrosion, no oxidation, and no micro-cracks on the surface.

Precision Slotted Drive: The deeper, standardized slot design prevents tool slippage (cam-out) during manual or automated installation, allowing for maximum torque transmission.

Superior Thread Engagement: Features clean, sharp, and well-defined thread pitches that offer excellent self-tapping capability and high pull-out resistance.

Product Parameter

Premium Material & Surface Treatment Options

To suit various industrial working environments, DONGSHAO provides diverse material grades and specialized coatings:

Carbon Steel (Grade 4.8, 8.8): Ideal for general hardware and structural applications.

Stainless Steel (SS304, SS316): Perfect for marine, food processing, and chemical environments requiring heavy anti-rust properties.

Brass / Copper: Excellent electrical conductivity and aesthetic finish for vintage furniture or electronic devices.

Surface Finishes: Plain (Oiled), Zinc Plated (Clear/Blue/Yellow), Black Oxide, Nickel Plated, and HDG (Hot Dip Galvanized).

Industrial Applications

Due to their robust mechanical properties and low-profile installation, DONGSHAO's slotted countersunk screws are widely utilized across global industries:

Steel Structures & Construction: Used heavily in architectural frameworks where joints must be flush to allow overlapping plates or sleek aesthetics.

Precision Machinery & Instruments: Its rich choice of performance grades makes it ideal for internal assemblies of automation hardware, medical devices, and laboratory gear.

Railway & Automotive Vehicles: Resistant to shearing forces and vibrations; commonly applied to interior panels and flooring assemblies.

Woodworking & Premium Cabinetry: Sinks perfectly into timber surfaces without snagging clothes or moving parts.

Heavy-Duty Packaging & Export Logistics

We understand that industrial fasteners can suffer from friction and moisture during long maritime voyages. DONGSHAO implements a 4-Layer Protective Packaging System:

Inner Layer: Moisture-proof and rust-inhibiting sealed plastic bags (small box option available).

Shock Absorption: Reinforced cardboard corrugated boxes designed to withstand heavy compression.

Hygienic Buffer: Anti-bacterial, eco-friendly wrapping sheets to isolate external elements.

Palletization: Standard export wooden pallets wrapped tightly with stretch film and heavy-duty plastic strapping to guarantee zero damage upon arrival at your port.

Why Choose DONGSHAO?

Hebei Dongshao Fastener Manufacturing Co., Ltd. is backed by decades of manufacturing expertise in China's premium fastener hub. Equipped with high-speed multi-station cold heading machines and automated optical sorting equipment, we eliminate defect rates down to the PPM level. From rapid prototype processing to full-tier wholesale distribution, our dedicated after-sales team ensures a seamless, worry-free procurement experience.