Introduction
Imperial Hex Head Bolt & Nut Sets (Clearance Flanges) are precision fastening components designed for assembling vacuum flange connections in high vacuum (HV) and ultra-high vacuum (UHV) systems. These bolt sets are specifically manufactured with imperial (inch-based) thread standards, making them compatible with vacuum hardware that follows traditional American or international vacuum equipment specifications.
Used together with clearance-type flanges such as CF (ConFlat®) or other vacuum flange systems, these hex head bolt and nut sets provide reliable mechanical strength and stable clamping force, ensuring a secure and leak-tight vacuum connection. They are widely used in semiconductor equipment, thin film deposition systems, vacuum research laboratories, and industrial vacuum installations.
Detailed Description
Imperial hex head bolt and nut sets for clearance flanges are engineered to provide durable fastening solutions in demanding vacuum environments. These sets typically include hex head bolts, matching nuts, and optional washers, allowing for consistent and secure flange assembly.
The bolts are usually manufactured from high-quality stainless steel such as 304 or 316, offering excellent corrosion resistance, mechanical strength, and compatibility with vacuum environments. Stainless steel fasteners also provide good resistance to oxidation and maintain structural integrity under thermal cycling conditions commonly encountered in vacuum systems.
Clearance flange connections are designed so that the bolts pass freely through the flange holes, while the clamping force is provided by the nuts on the opposite side. This configuration allows for easy alignment during installation and ensures even distribution of tightening force across the flange surface.
Imperial bolt sizes are typically standardized according to UNC or UNF thread specifications, ensuring compatibility with vacuum equipment manufactured according to U.S. standards. Precision machining and consistent thread quality help maintain reliable fastening performance and long service life.
These bolt sets are commonly used in conjunction with CF flanges and copper gaskets, which rely on uniform bolt tightening to achieve proper knife-edge sealing and maintain vacuum integrity.
Applications
Imperial hex head bolt and nut sets are used in many vacuum technology applications:
Ultra-high vacuum (UHV) systems in research laboratories
Thin film deposition equipment, including sputtering and evaporation systems
Semiconductor fabrication equipment
Vacuum chambers and pipeline connections
Particle accelerators and scientific instruments
General vacuum hardware assembly
Technical Parameters
| Parameter | Typical Value / Range | Importance |
|---|---|---|
| Fastener Type | Hex head bolt with nut | Provides secure flange fastening |
| Thread Standard | Imperial (UNC / UNF) | Compatible with inch-based vacuum hardware |
| Material | Stainless Steel 304 / 316 | Ensures corrosion resistance and durability |
| Compatibility | Clearance flanges (e.g., CF flanges) | Allows proper bolt-through assembly |
| Surface Finish | Precision machined threads | Ensures reliable tightening and long service life |
| Typical Sizes | 1/4″-20, 5/16″-18, 3/8″-16 (custom available) | Matches standard flange requirements |
Comparison with Related Fasteners
| Fastener Type | Key Advantage | Typical Application |
|---|---|---|
| Imperial Hex Head Bolt & Nut Set | Compatible with inch-based vacuum flange systems | CF clearance flange assemblies |
| Metric Bolt Sets | Used in metric vacuum hardware systems | ISO and metric flange assemblies |
| Stud Bolt Sets | Permanent stud installation | Fixed vacuum chamber connections |
FAQ
| Question | Answer |
|---|---|
| What are clearance flanges? | Clearance flanges have bolt holes large enough for bolts to pass through freely, with nuts providing the clamping force. |
| Why use imperial fasteners in vacuum systems? | Many vacuum systems—especially those based on U.S. standards—use inch-based thread specifications. |
| What materials are used for the bolts? | Most vacuum fasteners are made from stainless steel such as 304 or 316 for corrosion resistance and durability. |
| Are washers included in the bolt sets? | Washer options are available depending on system requirements and installation preferences. |
| Can custom bolt lengths be supplied? | Yes. Bolt lengths and thread specifications can be customized to match different flange sizes and configurations. |
Packaging
Our Imperial Hex Head Bolt & Nut Sets (Clearance Flanges) are meticulously tagged and labeled externally to ensure efficient identification and maintain strict quality control standards. Each set is packaged in protective sealed bags and organized containers to prevent contamination, thread damage, or loss during storage and transportation.
Conclusion
Imperial Hex Head Bolt & Nut Sets (Clearance Flanges) provide a reliable fastening solution for vacuum flange assemblies requiring inch-based hardware standards. With durable stainless steel construction, precision threads, and compatibility with clearance flange systems, these fasteners ensure secure and stable connections in demanding vacuum environments.
Designed for long-term performance in semiconductor equipment, thin film deposition systems, and scientific research facilities, these bolt sets are essential components in professional vacuum hardware assemblies.
For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.
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