Fine Pitch Hex Cap Bolts

Fine pitch hex cap bolts are precision fasteners designed for applications requiring superior holding power and resistance to vibrational loosening. Unlike standard coarse thread bolts, these have a finer thread pitch, meaning more threads per inch, which distributes loads more evenly and allows for finer adjustment. When selecting threaded fasteners for critical assemblies, it’s essential to understand the subtle differences between product variants. For projects demanding tighter tolerances, explore our Fine Thread Hex Head Bolts, which deliver consistent thread engagement in both metric and imperial sizes. In scenarios where even greater precision is necessary, such as in aerospace or high-performance automotive components, Extra Fine Thread Hexagon Head Bolts offer the ultimate thread density for maximum shear strength and minimal back-out risk. Fine pitch hex cap bolts bridge the gap between standard and extra fine threads, providing a balanced solution for general industrial use, machinery, and structural connections.

are manufactured to meet rigorous international standards, ensuring reliability across diverse environments. The hexagonal head profile allows for easy wrenching with standard tools, while the specific thread geometry prevents cross-threading during installation. Available in a range of materials—from alloy steel with protective zinc plating to stainless steel for corrosion resistance—these bolts can be tailored to your load requirements and exposure conditions. The fine pitch enhances tensile strength when installed into tapped holes or used with nuts, and it improves fatigue performance under cyclic loads. Dimensional accuracy is held to ISO 4017, DIN 933, or ASME B18.2.1 specifications, depending on your regional needs. Whether you're assembling hydraulic cylinders, engine blocks, or precision fixtures, these bolts provide dependable clamping force without compromising serviceability.

Key Specifications

• Thread type: Fine pitch (UNF, metric fine, or special upon request)
• Head style: Hexagonal, per standard wrench clearance dimensions
• Material grades: 8.8, 10.9, 12.9 (alloy steel); A2-70, A4-80 (stainless steel)
• Coating options: Zinc clear, yellow zinc, black oxide, hot-dip galvanized, plain/oiled
• Diameter range: M6 to M36 (metric); 1/4" to 1-1/2" (imperial)
• Length: 16mm to 300mm; custom lengths available
• Compliance: DIN 961 / ISO 8765, ASME B18.2.1, BS 3692
• Thread fit: 6g (metric) or 2A (imperial) as standard

Manufacturing consistency is verified through dimensional inspections, tensile testing, and hardness checks on every production lot. Threads are rolled after heat treatment to ensure fatigue resistance, and the underhead fillet radius is controlled to reduce stress concentration. Packaging can be provided in bulk cartons, smaller boxes, or custom kits to match your inventory needs. Lead times vary based on quantity and finish, but standard sizes are typically available for quick shipment. For non-standard dimensions or special material certifications, our engineering team can assist with technical drawings and sampling.