When discussing nuts, we typically first consider their structural variations—such as hex nuts, round nuts, cap nuts, flange nuts, square nuts, lock nuts, slotted nuts, and T-nuts—before mentioning materials like stainless steel or carbon steel. However, there is one type of nut where the material is the primary point of inquiry: the copper nut.
What Is a Copper Nut?
A copper nut, also known as a pre-embedded nut or plastic-embedded nut, is a specialized fastener made from high-quality copper or copper alloys (such as H59, H62). Depending on the application method, they can be categorized into hot-melt copper nuts, hot-press copper nuts, embedded copper nuts, and ultrasonic copper nuts.
Common Materials for Copper Nuts
- Brass: H59 / H62
- Lead Brass: HPb59-1
- Copper Alloys: C3604, C2700, C2720
- Tin Bronze / Aluminum Bronze
Standards and Specifications for Copper Nuts
The following are common standards, sizes, and specifications for copper nuts.
| Standard | Material | Size Range | Width Across Flats (mm) | Height (mm) |
|---|---|---|---|---|
| ASTM B16 | Free-Cutting Copper Alloy or Cold forging Copper Alloy | M3 – M24 | 5.5 – 36 | 2.4 – 19 |
| ASTM B36 | Brass Rod, Bar, and Shapes | M3 – M24 | 5.5 – 36 | 2.4 – 19 |
| DIN 934 | Copper Alloy | M1.6 – M64 | 3.2 – 95 | 1.3 – 51 |
| DIN 985 | Copper Alloy (Nyloc) | M3 – M20 | 5.5 – 30 | 4 – 20 |
Note: Common thread sizes for copper nuts, bronze nuts, and silicon bronze nuts
- Metric: M3, M4, M5, M6, M8, M10, M12, M16, M20, M24
- Imperial- 1/8″ , 3/16″, 1/4″, 5/16″, 3/8″, 1/2″, 5/8″, 3/4″ 1″
Characteristics of Copper Nuts
Copper nuts have many outstanding features: they are not easy to rust, are corrosion resistant, have high temperature resistance, are thermally and electrically conductive, are easy to process, have a stable structure, are aesthetically pleasing, and can also be injection molded. They can also be injection molded. They are widely used in faucets, valves, electrical switches, and mold injection molding.
What Types of Copper Nuts Are There?
Depending on the specific application, we will specify the type of copper nut required, such as standard hex copper nuts or embedded knurled copper nuts for injection molding. Copper nuts are categorized into three types based on their application: copper nuts for machine screws, copper nuts for set screws, and copper nuts for special-purpose screws.
Machine screws are the screws and bolts we commonly use. They have a head and a shank, such as hex bolts. They can be used with nuts or without nuts. The copper nuts used on these screws are no different from nuts made of other materials used in our regular applications.
Copper nuts for set screws are designed to be used in conjunction with set screws to secure the relative positions of two workpieces.
Copper nuts designed for use with special-purpose screws, such as nuts for eye bolts, high-strength self-locking copper nuts, and nylon self-locking copper nuts.
The applications of copper nuts extend beyond embedded nuts used in mold injection molding. Other types of copper nuts serve as standard nuts, differing only in their copper composition.
Beyond Fastener offers a full range of metric and imperial copper nuts, including hex nuts, lock nuts, flange nuts, wing nuts, cap nuts, square nuts, and custom copper nuts. We are a leading manufacturer, supplier, and exporter of copper and bronze nuts in China.
Copper Hex Nut
Copper Locknut
Hex Flange Copper Nut
Brass Cap Nut
Copper Wing Nut
Copper Knurled Nuts
Copper Nuts vs Steel Nuts: How to Choose?
| Item | Copper Nut | Steel Nut |
|---|---|---|
| Corrosion resistance | Excellent | Standard (requires electroplating for rust prevention) |
| Electrical conductivity | Excellent | Poor |
| Thermal conductivity | Good | Moderate |
| Strength | Moderate | High |
| Machinability | High | High |
| Appearance | Attractive metallic finish | Average |
| Cost | Medium to slightly high | Low |
Applications of Copper Nuts
铜螺母主要功能是提供稳定的螺纹锁固性能，适用于塑料件、树脂、铝件、薄板等需要金属嵌件增强的应用场景。
- Machining
Fastening installation in aluminum profiles and thin sheet metal.
- Water heating equipment
Faucets, valves
- Electronics and electrical appliances
Terminals, binding posts, sockets, controllers, relays, smart devices.
- Injection molded parts
As embedded parts (such as hot-melt copper nuts and ultrasonic copper nuts), they are used in various plastic products, such as injection molded housings, ABS, nylon parts, and thread reinforcement of PC materials.
- Aviation & Medical
Components that are corrosion resistant, electrically conductive, and highly stable.
