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M5, M6, M7, M8, M10, M12, M14, M16, M18
This series of cover-shaped nuts (also known as decorative nuts, round-head nuts, or cap nuts) is a multi-functional fastener that integrates the hexagonal nut body, protective cap, and internal thread into a single piece. It enables standard thread fastening while the top round cover can completely cover the exposed tip and thread of the bolt, providing three functions: anti-scratch, anti-corrosion, and enhancing aesthetics. It is an upgraded alternative to ordinary hexagonal nuts.
We offer four mainstream versions to meet the full range of requirements from conventional industry to high-end decoration:
304 stainless steel original color model
Galvanized carbon steel model
Oxidized black carbon steel model
Bronze model
No additional installation of decorative caps or protective covers is required. A single nut can simultaneously perform fastening, protection, and beautification, and is widely applicable to various threaded connection scenarios such as furniture, equipment, construction, and bathroom.
| Specification | Description |
| Material | Carbon Steel, Stainless Steel (e.g., 304, 316), Brass, Nylon, etc. |
| Coating | Zinc Plated, Galvanized, Nickel Plated, Black Oxide, Clear (raw material finish), etc. |
| Size Range | Diameters typically from M1.6 to M64, with corresponding thread lengths to fit various bolt sizes |
| Thread Type | Coarse and fine threads to suit different assembly requirements and materials |
| Strength Grade | Varies by material and manufacturing process, with options to suit light, medium, or heavy-duty applications |
| Thread Standards | Metric (M) and Imperial (e.g., #0, #1, #2, etc.) thread sizes |
| Dimensions | Overall height, width across flats, and thread length, which vary based on the size and thread pitch |
| Application Temperature | Operable across a range of temperatures, typically from -20°C to 120°C, depending on material |
| Load Capacity | Varies based on material, size, and thread type; suitable for light to heavy load applications |
| Packaging | Bulk packaging, bags, or small containers, often with a specified quantity per package |
Integrated into one: fastening, protection and decoration. Fully functional.
It is both a standard fastener and a built-in protective decorative cover. After tightening, it can completely cover the exposed part of the bolt, preventing sharp ends from scratching people and clothes. At the same time, it isolates the corrosion of moisture, oil and dust on the threads, significantly extending the connection lifespan. It can also beautify the exposed threaded connection points and enhance the overall appearance.
Multiple materials and versions, suitable for all scenarios
304 stainless steel model: excellent corrosion resistance and rust prevention performance, does not rust even in humid, outdoor or coastal environments for long-term use;
Bronze model: delicate texture, bright color, with decorative attributes, suitable for high-end furniture, bathrooms, decoration projects;
Galvanized carbon steel model: cost-effective choice, with basic rust prevention ability, suitable for most conventional industrial scenarios;
Blackening carbon steel model: high hardness, wear-resistant and scratch-resistant, suitable for heavy loads, oil stains, mechanical working conditions.
Integrated molding process, stable without detachment
The nut body and the top round cover are forged as one piece without welding or splicing, evenly distributed force and less likely to break; The cap and the nut are firmly combined, not likely to detach during long-term use, avoiding the problem of lost or失效 of separate decorative caps.
Precise thread processing， full adaptability
The internal thread adopts precise rolling processing， with strict tolerance control， perfectly compatible with standard metric bolts， smooth and unobstructed when tightened， without loose teeth or slip problems， ensuring the stability of the connection.
Safety upgrade， eliminating risks
The round cover completely covers the bolt tip， completely eliminating the safety hazards brought by sharp parts， especially suitable for children's furniture， public facilities， kitchen and bathroom appliances and other scenarios with high safety requirements.
1. Industrial Machinery: Cap nuts are widely used in industrial machinery to secure various components, such as motors, pumps, and gearboxes. Their precision threading and anti-rotation features ensure a stable and reliable connection, even in high-vibration environments.
2. Electrical Equipment: In electrical equipment, cap nuts are used to protect the threads of bolts that hold electrical components together. They also prevent dust and debris from entering the equipment, ensuring its proper operation and safety.
3. Signage and Display: Cap nuts are often used in signage and display applications to attach signs, frames, and other decorative elements. Their aesthetic appeal and customizable finishes make them a popular choice for creating a professional and attractive appearance.
4. Fitness Equipment: For fitness equipment, cap nuts are used to secure various parts and components, such as weights, handles, and frames. Their durability and protection features ensure the safety and reliability of the equipment during use.
304 stainless steel model: Suitable for outdoor facilities, photovoltaic supports, ship accessories, kitchen and bathroom appliances, coastal equipment, children's furniture, etc. in humid / prone to corrosion / high safety requirement environments;
Bronze model: Applicable to high-end solid wood furniture, bathroom hardware, decoration projects, handicraft production, retro-style equipment assembly, etc. in scenarios that require aesthetic appeal;
Galvanized carbon steel model: Suitable for general mechanical equipment, electrical equipment, storage shelves, ordinary furniture, building curtain walls, etc. in common industrial scenarios;
Blackened carbon steel model: Applicable to construction machinery, mining equipment, machine tool accessories, heavy-duty equipment, automotive parts, etc. in high-frequency vibration / oil-soiled working conditions;
Q1: Can I paint the cap nut to match my product's color?
A: While some finishes may not be suitable for painting, in many cases, you can paint the cap nut. However, it is important to ensure that the surface is clean and properly prepared before painting. You may also want to check with our technical support team for any specific recommendations or precautions.
Q2: Are your cap nuts suitable for use in food processing applications?
A: We offer cap nuts made from materials that are suitable for use in food processing applications, such as stainless steel. These materials are non-toxic and meet the relevant hygiene standards. However, it is important to ensure that the specific cap nut you choose is approved for use in food processing and that it is properly installed and maintained.
Q3: What is the lead time for customizing cap nuts with a specific finish or marking?
A: The lead time for customizing cap nuts depends on the complexity of the customization and the quantity of the order. Generally, it may take a few days to a few weeks. Please contact our sales team for a specific lead time estimate based on your requirements.
Q4: Can cap nuts be used in applications with high humidity?
A: Cap nuts made from materials with good corrosion resistance, such as stainless steel or zinc-plated steel, can be used in applications with high humidity. However, it is still important to monitor the condition of the cap nuts regularly and take appropriate measures to prevent corrosion if necessary.
