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Flat head bolt

Parameter Category	Description
Thread Standard	Metric (ISO): M3–M24; Imperial (UNC/UNF): #2–3/4"
Material & Grade	Carbon steel: Grade 4.8/8.8; Stainless steel: 304/316 ; Brass
Surface Treatment	Zinc-plated ; Black oxide coating; Passivation ; Nickel plating
Size & Dimensions	Shank length: 6mm–200mm; Head angle: 90° / 60°; Drive type: Slotted / Phillips / Torx / Hex socket

Overview
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Structural Features
Features a conical countersunk head that sits perfectly flush with the workpiece surface. It typically has a 90° tapered head (or 82° for imperial) and a drive recess (e.g., Phillips, Torx) for easy installation. The shank can be partially or fully threaded. Common variants include stainless steel and flat head flange designs.

Performance Advantages
Provides a smooth, flush finish that eliminates protrusions and snagging hazards. The conical shape ensures good load distribution and stability. Compatible with wood, metal, and plastic, and available in various drive types to prevent slipping. Cost-effective, corrosion-resistant, and ideal for mass production.

Application Scenarios
Widely used in furniture and cabinetry for invisible joints, as well as in electronic chassis to save space. Essential for automotive dashboards and aerospace interiors to maintain aerodynamics. Also perfect for DIY projects requiring a clean, professional look.