Stainless Steel Countersunk Socket Head Cap Screw — Product Description

Stainless Steel Countersunk Socket Head Cap Screw is a high-precision fastener featuring a conical countersunk head design with an internal hexagonal drive, conforming to DIN 7991 / ISO 10642 and GB/T 70.3 standards, with specifications covering M2-M20. After installation, the head is completely embedded below the workpiece surface, achieving a flush assembly finish. The product is manufactured using 304 (A2-70) or 316 (A4-70) stainless steel, providing excellent rust and corrosion resistance, widely used in precision machinery, electronic equipment, medical devices, and high-end architectural decoration where surface flatness and rust prevention are critical.

I. Product Features

90° Countersunk Cone Design: The head features a 90° conical angle countersunk structure, flush with the workpiece surface after installation, without any protrusion, ensuring a flat and smooth assembly surface that does not interfere with adjacent moving parts or aesthetic appearance.

Internal Hexagonal Drive: The hexagonal socket has high dimensional accuracy (strict tolerances), providing uniform force distribution when tightened with a hex key, effectively preventing cam-out, suitable for high-strength fastening operations in confined spaces.

Full Thread Design: The shank features a full thread structure (partial thread available for some specifications upon request), fitting tightly with threaded holes, providing secure and reliable locking with complete fastening length.

Stainless Steel Material, Rust and Corrosion Resistant: Using 304 (06Cr19Ni10) or 316L stainless steel, providing excellent resistance to acid, alkali, and salt spray, suitable for long-term use in humid, coastal, and chemical corrosion environments without surface coating, achieving lifetime maintenance-free operation.

Clear Performance Grades: Common performance grades are A2-70 (304 material, tensile strength ≥700MPa) and A4-80 (316 material, tensile strength ≥800MPa), meeting different strength requirements.

Standardized Specification Production: Strictly manufactured according to DIN 7991 / ISO 10642 / GB/T 70.3 standards, covering specifications from M2 to M20, with lengths from 3mm to 100mm available, high dimensional accuracy, good interchangeability.

II. Product Advantages

Flat and Aesthetic Assembly Surface: The countersunk design ensures the workpiece surface is flat without protrusion after installation, particularly suitable for equipment, panels, and decorative structures with high aesthetic requirements, avoiding exposed screw heads that affect appearance.

Rust and Corrosion Resistant, Maintenance-Free: Stainless steel material fundamentally eliminates rust issues, requiring no oiling or replacement throughout the equipment’s lifecycle, significantly reducing maintenance costs, especially suitable for humid, outdoor, food, and medical environments with high hygiene requirements.

Cam-Out Resistant, Stable Locking Torque: The internal hexagonal socket is stamped with high precision, providing uniform force distribution when engaged with the wrench, resistant to cam-out. Compared to Phillips drive (H-type), it can withstand greater tightening torque, suitable for high-strength fastening operations.

Easy Installation, Suitable for Tight Spaces: Requires only a hex key for quick tightening, no specialized tools needed, simple operation, particularly suitable for assembly operations in confined spaces such as equipment interiors and panel backsides.

High Strength and Toughness Combined: A2-70/A4-70 materials undergo solution treatment, maintaining sufficient tensile strength while preserving excellent elongation, resistant to brittle fracture, suitable for assembly connections subjected to dynamic loads.

High Standardization, Convenient Procurement: Following DIN 7991 / ISO 10642 international standards, standardized dimensions, strong market universality, convenient stocking and procurement, guaranteed delivery cycle.

III. Application Scope

Stainless Steel Countersunk Socket Head Cap Screw is specifically designed for various assembly scenarios with high requirements for surface flatness and rust prevention, core applications include:

Precision Mechanical Equipment: Installation of protective covers, guide rail pressure plates, panel fastening for CNC machines, laser cutting machines, injection molding machines, automation equipment.

Electronics and Instruments: Fastening connections for precision electronic equipment enclosures, instrument panels, control cabinets, laboratory work surfaces.

Medical Devices: Assembly of stainless steel medical carts, surgical tables, rehabilitation equipment, cleanroom facilities with high hygiene standards.

High-End Architectural Decoration: Fastening connections for stainless steel railings and handrails, glass curtain wall spider fittings, bridge decorative panels, indoor and outdoor metal decorative structures.

Marine and Ocean Engineering: Corrosion-resistant connections for ship deck fittings, outfitting components, coastal trestles, and ocean engineering equipment.

Food and Pharmaceutical Equipment: Equipment assembly for food processing machinery, pharmaceutical equipment, packaging machinery with high requirements for rust prevention and hygiene.