Fine Pitch Hex Cap Screws

Fine pitch hex cap screws deliver high-strength clamping and exceptional resistance to vibration loosening in demanding assemblies. By reducing the thread pitch compared to standard coarse-thread fasteners, these screws achieve deeper thread engagement and improved load distribution across each joint. This makes them a preferred choice for engine components, hydraulic manifolds, and precision tooling where fine adjustments and repeatable torque values are critical. When specifying fasteners for general fine-thread applications, our Fine Thread Hex Head Screws offer a reliable balance of strength and availability. For assemblies requiring the highest level of thread precision and minimal runout, the Extra Fine Thread Hexagon Head Screws provide ultra-close tolerances that excel in aerospace, medical devices, and high-speed automation.

Fine Pitch Hex Cap Screws are manufactured to rigorous international standards including DIN 961, ISO 8676, and equivalent ASME specifications. The hexagon head profile allows efficient torque application with standard wrenches and sockets, while the fine pitch geometry minimizes the risk of self-loosening under dynamic or fluctuating loads. Common materials include heat-treated carbon steel in property classes 8.8, 10.9, and 12.9, as well as austenitic stainless steels such as A2-70 and A4-80 for superior corrosion resistance. Surface finishing options range from zinc electroplating and black oxide to hot-dip galvanizing and Dacromet coatings, each tailored to specific environmental and mechanical demands. Typical usage covers flange connections, gearbox assemblies, structural brackets, and high-pressure fluid systems where thread integrity is paramount.

Key Specifications

• Standards: DIN 961, ISO 8676, ASME B18.2.1 fine thread series
• Thread configuration: Metric fine pitch (ISO 8676), UNF / UNC fine
• Material grades: Carbon steel 8.8, 10.9, 12.9; Alloy steel; Stainless steel A2, A4
• Diameter range: M6 – M36 (metric), 1/4″ – 1-1/2″ (inch)
• Fine pitch values: 0.75 mm – 3.0 mm (metric), 28 – 16 TPI (inch)
• Head type: Hexagon head per ISO 4017, DIN 933 / 931
• Drive: External hex
• Surface protection: Zinc clear/blue/yellow, black oxide, hot-dip galvanized, Dacromet, Geomet
• Packaging: Bulk cartons, plastic bins, customized kits

Standard Dimensions