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Vented Silver Plated Bolts (SI)

Vented Silver Plated Bolts (SI)

TFM offers Vented Silver Plated Bolts (SI) engineered for high-vacuum and UHV applications where outgassing must be minimized. These bolts feature a precision-drilled vent hole along the axis to allow trapped gases to escape during pump-down, significantly reducing virtual leaks and improving vacuum system efficiency.

Key Features

  • Vented Design: Axial venting ensures fast and reliable evacuation of gases from threaded blind holes in vacuum systems.

  • Silver Plating: Provides superior thermal and electrical conductivity while offering excellent resistance to galling, especially useful during repeated tightening in vacuum conditions.

  • Stainless Steel Core: Manufactured from high-quality 18-8 stainless steel or equivalent, offering outstanding strength and corrosion resistance.

  • Thread Type: Available in both metric (M) and imperial (UNC/UNF) thread types, compatible with a wide range of vacuum flanges and components.

  • Cleanroom Ready: Parts are precision-cleaned and vacuum-packaged, ready for immediate use in cleanroom and vacuum environments.

Vented Silver Plated Bolts (SI) Applications

  • UHV chambers and vacuum systems

  • Semiconductor processing equipment

  • Particle accelerators and beamlines

  • Cryogenic and spaceflight assemblies

  • High-purity gas distribution setups

Benefits of Silver Plating

  • Enhances electrical conductivity, reducing contact resistance in grounding and RF applications

  • Prevents seizing or galling in stainless steel threads

  • Provides a low-friction surface ideal for precise torque applications

Dimensional Drawings

Ordering Table

Reference Material Thread Size Part Number
Standard Headbolts Ag plated #2-56 HCHU0256-013S4PV
Standard Headbolts Ag plated #2-56 HCHU0256-031S4PV
Standard Headbolts Ag plated #2-56 HCHU0256-050S4PV
Standard Headbolts Ag plated #4-40 HCHU0440-013S4PV
Standard Headbolts Ag plated #4-40 HCHU0440-031S4PV
Standard Headbolts Ag plated #4-40 HCHU0440-050S4PV
Standard Headbolts Ag plated #4-40 HCHU0440-088S4PV
Standard Headbolts Ag plated #6-32 HCHU0632-013S4PV
Standard Headbolts Ag plated #6-32 HCHU0632-031S4PV
Standard Headbolts Ag plated #6-32 HCHU0632-050S4PV
Standard Headbolts Ag plated #6-32 HCHU0632-075S4PV
Standard Headbolts Ag plated #8-32 HCHU0832-018S4PV
Standard Headbolts Ag plated #8-32 HCHU0832-038S4PV
Standard Headbolts Ag plated #8-32 HCHU0832-056S4PV
Standard Headbolts Ag plated #8-32 HCHU0832-088S4PV
Standard Headbolts Ag plated #8-32 HCHU0832-125S4PV
Standard Headbolts Ag plated #10-32 HCHU1032-038S4PV
Standard Headbolts Ag plated #10-32 HCHU1032-056S4PV
Standard Headbolts Ag plated #10-32 HCHU1032-075S4PV
Standard Headbolts Ag plated #10-32 HCHU1032-113S4PV
Standard Headbolts Ag plated #10-32 HCHU1032-150S4PV
Standard Headbolts Ag plated 1/4-28 HCHU2528-050S4PV
Standard Headbolts Ag plated 1/4-28 HCHU2528-150S4PV
Standard Headbolts Ag plated 5/16-24 HCHU3124-050S4PV
Standard Headbolts Ag plated 5/16-24 HCHU3124-081S4PV
Standard Headbolts Ag plated 5/16-24 HCHU3124-125S4PV
Standard Headbolts Ag plated 5/16-24 HCHU3124-200S4PV
Reference Material Thread Size Part Number

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FAQ

Tube fittings are designed for tubes (measured by outside diameter and wall thickness) used in high-pressure and instrumentation applications, whereas pipe fittings are for pipes (identified by nominal pipe size) primarily used in fluid transport.

 

Common valve types include ball valves, gate valves, check valves, butterfly valves, and globe valves. Each serves a specific function—from quick shutoff (ball/gate valves) to flow regulation (globe valves).

 

  • For tubing, measure the outside diameter; for pipes, refer to the nominal pipe size (using conversion charts if needed). Always match the valve or fitting size to your pipe’s dimensions and flow requirements.

  • Frequently used thread types include NPT (National Pipe Tapered), BSP (British Standard Pipe), and UNC, along with slip-fit options that rely on compression or fusion rather than threads.

Interchangeability depends on manufacturer specifications and certification. Always verify compatibility via manufacturer guides or certified interchangeability charts.

 

  • A coupling is a short, straight fitting used to join two pipes or tubes. It provides a secure, leak-tight connection and can sometimes serve to extend or repair piping runs.

Consider valve type, pressure and temperature ratings, material compatibility with your fluid, actuation method (manual or automatic), and maintenance requirements.

 

  • Valves regulate flow by opening, closing, or partially obstructing the pathway. Their mechanisms (such as the rotation of a ball or the linear movement of a gate) determine the speed and precision of flow control.

  • A flange is a flat, circular component used to connect pipes, valves, or other equipment. Bolted together with gaskets, flanges provide a secure, leak-proof joint that facilitates both assembly and maintenance.

  • Manual valves require physical operation via handles or levers, whereas actuated valves use mechanisms—pneumatic, electric, or hydraulic—to open and close automatically or remotely.

  • Issues include leaks caused by improper installation, over-tightening, degraded seals, material incompatibility, and fatigue from repeated cycling. Regular inspection and proper installation practices help mitigate these problems.

Regular maintenance involves periodic inspections, cleaning or replacing worn seals, ensuring proper torque during installation, and adhering to manufacturer guidelines and local plumbing codes to preserve system integrity.

 

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