Flat head bolts, also known as countersunk hex socket bolts or flat cup screws, are core fasteners for flush connection in industrial aluminum profiles and mechanical equipment.

Common names: Flat head screws, countersunk hex socket screws, flat cup bolts

Standards: DIN 7991, GB/T 70.3, ISO 10642

Full English Name: Hexagon Socket Countersunk Head Cap Screw

Core Features

Adopt 90° tapered countersunk head with hex socket drive. The head can be fully embedded into workpieces after installation without any surface protrusion.

Main Materials

• 304 Stainless Steel: Excellent rust and corrosion resistance, ideal for humid, clean and food-grade working environments.

• 8.8 / 10.9 Grade Carbon Steel: Galvanized or nickel-plated finish, featuring high tensile strength and cost performance.

Surface Finishing

Stainless steel version with mirror polishing; carbon steel version commonly finished with blue-white zinc plating or black oxide coating.

Driving Mode

Hex socket drive; e.g. M6 bolt matches 4mm hex key.

Advantages

Flush Installation, Neat & Safe

The 90° tapered head fits perfectly into countersunk holes for fully flush finish. It prevents scratch hazards and keeps the whole frame tidy, perfect for aluminum profile workbenches and safety enclosures.

Wide Application & Strong Compatibility

Apart from profile connection, it is widely used to fasten angle brackets, connection plates, handles, hinges and other accessories. It is also applicable to mechanical devices, automatic production lines and furniture assembly.

High Connecting Strength & Easy Operation

Hex socket design provides great torque transmission for firm locking. Welding-free installation enables easy disassembly and later structural adjustment, meeting flexible production requirements.

Excellent Anti-loosening Performance

Tight fitting with tapered countersunk holes ensures stable connection and effectively prevents loosening, suitable for mildly vibrating conveyor and assembly lines.

Material	12.Grade 9 high-strength carbon steel or 304 stainless steel
Color	Zinc-plated silver
Order NO.	XY-M4*10	XY-M6*16
	XY-M5*10	XY-M6*20
	XY-M6*10	XY-M8*16
	XY-M6*12
Multiple specifications are available; please contact the sales staff.

Company Profile

Shanghai Xuying Industrial Co., Ltd., established in January 2013, boasts nearly 20 years of experience in the industry.

Currently, our company primarily engages in the research, development, production, and sales of first-generation lean pipes (steel-plastic composite pipes), second-generation lean pipes (stainless steel pipes), third-generation lean pipes (aluminum alloy pipes), and related accessories, as well as aluminum profiles, accessories, and equipment.

The finished equipment we can currently provide for enterprises includes: lean pipe workbenches, lean pipe assembly lines, U-shaped production lines, flow rail lean pipe racks, lean pipe storage racks, lean pipe turnover racks, aluminum profile workbenches, aluminum profile frames, aluminum profile partition walls, and other industrial finished product series.