Views: 0 Author: Site Editor Publish Time: 2026-10-23 Origin: Site
High-speed automated production lines and heavy machinery operations require streamlined, reliable joint configurations:
Elimination of Loose Washers: Managing separate flat and lock washers increases assembly part counts and introduces the risk of missing washers on factory lines.
Spanning Slotted & Oversized Holes: In vehicle frames and structural brackets, assembly tolerances require slotted holes. The wide flange distributes bearing pressure across the slot to prevent joint pull-through.
Consistent Clamping Preload: An integrated flange provides a uniform bearing surface, reducing friction variance during torque-controlled pneumatic tightening.
┌────────────────────────────────────────────────────────────────────────┐ │ FLANGE NUT CONFIGURATIONS │ ├──────────────────────────────────┬─────────────────────────────────────┤ │ 1. Serrated Hex Flange Nut │ 2. Non-Serrated (Smooth) Flange Nut │ │ [Directional Locking Teeth] │ [Smooth Broad Flange Base] │ │ ▼ │ ▼ │ │ Teeth bite into mating metal │ Uniform bearing distribution │ │ Requires higher break-loose │ Protects surface paint/coatings │ │ torque than tightening torque │ from scoring and scratches │ └──────────────────────────────────┴─────────────────────────────────────┘
Serrated Flange Locking Action: The underside of the flange is formed with radial, directional ratchet-style serrations. As the nut is tightened, the sloped face of the teeth slides across the mating surface. Under reverse vibrational rotation, the sharp vertical edges of the teeth dig into the mating substrate, requiring a break-loose torque that is typically 10% to 25% higher than the original tightening torque.
Smooth (Non-Serrated) Flange Nut Function: Engineered with a smooth bearing face. Used on coated, painted, or non-ferrous soft metal surfaces (such as aluminum) where surface scratching could initiate corrosion or galling.
| Nominal Size | Standard Pitch | Strength Grades Available | Surface Protective Coatings | Primary Industry Applications |
|---|---|---|---|---|
| M5 / M6 | 0.8mm / 1.0mm | Class 8 / Class 10 / Stainless A2 | Zinc Plated (Clear/Yellow) | Electrical enclosure mounting, motorcycle engine brackets, appliance chassis |
| M8 / M10 | 1.25mm / 1.5mm | Class 8 / Class 10 / 40Cr Alloy | Electro-Galvanized / Dacromet | Automotive suspension control arms, alternator brackets, conveyor rollers |
| M12 / M16 | 1.75mm / 2.0mm | Class 10 / Class 12 Alloy Steel | Hot-Dip Galvanized / Black Oxide | Heavy truck chassis framing, agricultural tillage equipment, structural steel clips |
Answer: Using serrated flange nuts directly on soft aluminum can cause deep gouging and localized metal galling during tightening. For aluminum assemblies, smooth (non-serrated) flange nuts or serrated flange nuts paired with hardened steel backing plates are recommended.
Answer: Nylon-insert lock nuts rely on polymer friction around the bolt threads and are temperature-limited (typically up to 100°C–120°C). All-metal serrated flange nuts maintain their locking performance under high-temperature conditions (such as engine exhaust manifolds) and are unaffected by oils or solvents.
Donghuang Hardware supplies industrial flange nuts conforming to international standards (such as DIN 6923 / ISO 4161) with batch traceability.
Product Catalog: View flange nuts at dh-hardware.com/Nut-pl46711397.html.
Direct RFQ: Email tony@wf-fastener.com / Phone: +86-13355841616.
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