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Precision Hex Coupling Nuts (Extended Standoff Threaded Fasteners) Engineered for structural framing heavy equipment assembly and suspended mechanical systems our precision-machined Hex Coupling Nuts provide high-strength threaded connections to join two male-threaded fasteners. Manufactured using premium-grade carbon steel stainless steel (304 / 316) and brass these industrial standoffs deliver exceptional torque retention and fatigue resistance under high load profiles. Technical Specifications & Tolerances: Thread Standards: Fully compliant with ASME B1.1 Class 2B precision fit for standard industrial clearance; Class 3B tolerances available upon request for high-vibration aerospace and automotive applications. Available in both Unified Coarse (UNC) and Fine (UNF) thread profiles as well as ISO Metric threads (M3 to M24). Dimensional Standards: Designed in accordance with ASME B18.2.2 (Square and Hex Nuts). Standard lengths range from 3/4" to 3" with custom length-to-diameter ratios engineered to exact CAD drawing specifications. Dimensional Tolerances: Hex width across flats (AF) strictly maintained within ±0.003" (±0.08 mm) to eliminate wrench slippage and speed up automated assembly lines. Overall length tolerance held within ±0.005" (±0.13 mm). Material Grades & Surface Finishes: Carbon Steel: Grade 2 Grade 5 and Grade 8 steel options. Plating & Corrosion Protection: Electro-zinc plated per ASTM F1941 / ASTM B633 (Clear Yellow Chromate or Black) for indoor applications; Hot-Dip Galvanized (ASTM A153) or Zinc-Nickel plating for 1000+ hour salt-spray corrosion resistance in harsh marine and outdoor environments. Stainless Steel: 304 (A2) for general rust resistance; 316 (A4) per ASTM A193/A194 for extreme chemical and off-shore exposure. Key Applications: Ideal for threaded rod extensions tension tie-rods strut channel installations electrical conduit rigging and custom standoff spacer assemblies. Full material traceability certificates (MTR per EN 10204 3.1) and RoHS / REACH compliance reports are provided with every OEM order.