China Round Nut Manufacturer, Supplier, Factory

Round Nuts are essential components in various industries, offering reliable fastening solutions for applications requiring a smooth, circular shape. Often compared to Hexagon Nut or Square Nut types, the primary distinction lies in their design; Round Nuts lack external flat surfaces for a wrench, making them ideal for situations where a low-profile, aesthetically pleasing finish is necessary. They are frequently used in conjunction with washers or within pre-tapped holes. While a Hexagon Flange Nut incorporates a built-in washer to distribute load, and a Lock Nut is engineered to resist loosening under vibration, the standard Round Nut provides a fundamental and versatile threaded connection.


The Round Nut excels in applications where a standard hexagonal or square profile is undesirable or impractical. Its seamless cylindrical exterior minimizes snagging and presents a clean, finished look, making it a preferred choice in furniture assembly, consumer electronics, and decorative metalwork. The Round Nut is typically installed using a spanner wrench that fits into the internal holes or notches machined into its face, allowing for secure tightening without marring the external surface. This design is particularly advantageous in confined spaces where a standard wrench cannot achieve the necessary rotation.

Key Features of Our Round Nuts:

  • Manufactured from high-grade materials including carbon steel, stainless steel, and brass.
  • Available in a wide range of thread sizes and pitches to meet international standards.
  • Smooth, burr-free finish for enhanced safety and corrosion resistance.
  • Precision machined for consistent thread engagement and reliable performance.
  • Optional zinc, chrome, or hot-dip galvanized plating for superior corrosion protection.

Technical Specifications

Property Specification / Value
Standard ISO 4035, DIN 1587, ANSI B18.2.2
Common Materials Grade 5 Steel, 304 Stainless Steel, A36 Steel, Naval Brass
Strength Grades (Steel) Grade 5, Grade 8, Class 10
Common Finishes Plain, Zinc-Plated, Hot-Dip Galvanized, Dichromate
Temperature Range -50°C to +300°C (varies by material)
Corrosion Resistance Excellent (Stainless Steel/Brass), Good (Plated Steel)

Detailed Product Parameters

Nominal Size (M) Width Across Flats (A) mm Height (H) mm Thread Pitch (mm) Approx. Weight (per 1000 pieces, kg)
M4 7.00 3.20 0.70 0.95
M6 10.00 5.00 1.00 3.10
M8 13.00 6.50 1.25 6.80
M10 17.00 8.00 1.50 13.50
M12 19.00 10.00 1.75 22.00
M16 24.00 13.00 2.00 48.00

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