Cap Screw Overview
A Cap Screw is a high-strength threaded fastener designed for secure mechanical assembly where high clamping force and structural integrity are required. It is commonly used in precision machinery and industrial equipment where standard screws are not sufficient.
Cap Screws are typically installed using hex keys or external wrenches depending on the head design, providing excellent torque control and fastening stability.
Types of Cap Screw
Key-CNC offers multiple configurations of Cap Screw to meet different engineering requirements:
Socket Head Cap Screw Internal hex drive
Hex Head Cap Screw External hex head design
Flange Cap Screw Integrated washer-style flange
Heavy-Duty Cap Screw Reinforced head and shaft design
Applications of Cap Screw
Our Cap Screw products are widely used across multiple high-performance industries:
Electric Appliance
In electrical appliance manufacturing, this type of precision fastener is commonly used for internal structural assembly and housing fixation in products such as home appliances, control systems, and power units.
Electronic Equipment
For electronic systems including control panels, communication devices, and industrial electronics, it is applied in PCB housings, metal frames, and shielding structures.
Medical Equipment
In medical applications such as diagnostic machines, imaging systems, and surgical instruments, stainless steel versions are commonly selected for their corrosion resistance and hygiene performance.
Furniture Industry
In modern furniture production, it is widely used in metal frames, modular structures, office chairs, and load-bearing joints.
Children's Toys Industry
For toy manufacturing, it is used in assembling durable mechanical structures and plastic-metal hybrid components.
Sports Industry
In fitness and sports equipment such as gym machines, bicycles, and training systems, it is used to handle dynamic loads and vibration.
Auto Parts
In automotive systems including engines, chassis, interior modules, and EV battery assemblies, it plays a key role in high-strength structural connections.
Baby Car Seat
In child safety seating systems, it is used in structural frames and locking assemblies where safety and stability are essential.
Technical Specifications of Cap Screw
| Category | Specification Details |
|---|---|
| Materials |
Stainless Steel (304, 316, 316L) Alloy Steel (Grade 8, 10.9, 12.9) Carbon Steel (heat-treated available) Titanium (Ti-6Al-4V for high strength & lightweight applications) |
| Size Range |
Metric: M3 – M64 Imperial: #4 – 2-1/2" Length: 5 mm – 300 mm (custom sizes available) |
| Thread Standards | ISO 4014 / ISO 4017DIN 912 / DIN 933UNC / UNFMetric fine & coarse threads |
| Mechanical Performance |
Tensile Strength: up to 1200–1600 MPa Hardness: HRC 25–45 (depending on material grade) High fatigue resistance for dynamic and cyclic loading conditions |
| Surface Finishing Options |
Zinc plating Black oxide coating Nickel plating Stainless steel passivation Custom anti-corrosion coatings available |
Quality Control Process
To ensure every Cap Screw meets international standards, we implement strict quality control procedures:
- Incoming material inspection (IQC)
- In-process dimensional verification
- Thread gauge inspection (GO / NO-GO)
- Surface roughness measurement
- Final inspection using CMM and hardness testing
- Each batch is fully inspected before shipment to ensure reliability and consistency.
Why Choose Key-CNC Cap Screw
- High-precision CNC manufacturing for consistent quality
- Strong mechanical performance for industrial applications
- Custom design and non-standard sizes available
- Fast prototyping and scalable production capability
- Full certification for international market compliance
- Engineering support for material and design optimization
FAQ
Q: What is the difference between a Cap Screw and a regular bolt?
A: A Cap Screw is designed for higher precision and tighter tolerances compared to standard bolts. It typically features a more accurate thread profile, higher strength rating, and better performance under load, making it suitable for engineering-grade assemblies rather than general construction.
Q: How do I choose the right material for Cap Screw?
A: Material selection depends on the working environment:
Stainless steel is ideal for corrosion resistance (medical, outdoor, electronic use)
Alloy steel (Grade 10.9 / 12.9) is suitable for high-strength mechanical systems
Titanium is used for lightweight and aerospace applications
If unsure, Key-CNC can recommend the most suitable material based on your application.
Q: Can Cap Screws be customized in size or thread?
A: Yes. Key-CNC provides full customization for Cap Screw production, including non-standard lengths, special thread types, head designs, and surface finishes. Custom manufacturing is ideal for OEM projects and engineering prototypes.
Q: Why do Cap Screws sometimes loosen during use?
A: Loosening usually occurs due to vibration, improper torque, or unsuitable thread locking methods. For high-vibration environments, we recommend using thread-locking coatings, lock washers, or selecting flange-type Cap Screws for better stability.
Q: What quality standards do your Cap Screws meet?
A: All Key-CNC Cap Screws are manufactured under strict quality control systems and comply with:
ISO 9001 quality management system
SGS material testing standards
CE mechanical safety requirements
RoHS environmental compliance
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