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Vented Stainless Steel Bolts (SI)

Vented Stainless Steel Bolts (SI)

TFM offers premium Vented Stainless Steel Bolts (SI) engineered for use in high-vacuum and ultra-high-vacuum (UHV) environments. These bolts are manufactured with a precision axial vent hole that allows trapped gases to escape from blind holes, minimizing virtual leaks and significantly improving pump-down times.

Key Features

  • Axially Vented Design
    The central vent hole enables the efficient release of trapped gases, preventing virtual leaks and reducing outgassing in vacuum systems.

  • High-Quality Stainless Steel
    Made from robust and corrosion-resistant 18-8 stainless steel or 304/316 grades, suitable for demanding scientific and industrial environments.

  • Silver Inch (SI) Threading
    These bolts follow the inch-based thread standard with high precision, compatible with a wide range of UHV flanges and vacuum components.

  • Cleanroom Ready
    Every bolt is ultrasonically cleaned, vacuum-packed, and double-bagged, ensuring suitability for immediate use in cleanrooms and contamination-sensitive systems.

  • Custom Options Available
    TFM can provide various head styles, lengths, and coatings such as silver or MoS₂ for galling prevention and enhanced performance.

Applications

  • UHV and high-vacuum systems

  • Semiconductor and electronics manufacturing

  • Surface science and thin film deposition systems

  • Aerospace, cryogenics, and satellite technologies

  • Analytical instruments and research-grade chambers

Why Choose TFM?

TFM’s Vented Stainless Steel Bolts (SI) are trusted by vacuum engineers, researchers, and manufacturers worldwide for their reliability, cleanliness, and precision. Whether you’re upgrading a vacuum chamber or building a new system, these bolts provide the performance you need.

Dimensional Drawings

Ordering Table

Reference Length Material Thread Size Part Number
Screw, Cap Hardware, No Finish, Vented 0.13 SST #2-56 HCHU0256-013S40V
Screw, Cap Hardware, No Finish, Vented 0.31 SST #2-56 HCHU0256-031S40V
Screw, Cap Hardware, No Finish, Vented 0.5 SST #2-56 HCHU0256-050S40V
Screw, Cap Hardware, No Finish, Vented 0.13 SST #4-40 HCHU0440-013S40V
Screw, Cap Hardware, No Finish, Vented 0.31 SST #4-40 HCHU0440-031S40V
Screw, Cap Hardware, No Finish, Vented 0.5 SST #4-40 HCHU0440-050S40V
Screw, Cap Hardware, No Finish, Vented 0.88 SST #4-40 HCHU0440-088S40V
Screw, Cap Hardware, No Finish, Vented 0.13 SST #6-32 HCHU0632-013S40V
Screw, Cap Hardware, No Finish, Vented 0.31 SST #6-32 HCHU0632-031S40V
Screw, Cap Hardware, No Finish, Vented 0.5 SST #6-32 HCHU0632-050S40V
Screw, Cap Hardware, No Finish, Vented 0.75 SST #6-32 HCHU0632-075S40V
Screw, Cap Hardware, No Finish, Vented 0.19 SST #8-32 HCHU0832-018S40V
Screw, Cap Hardware, No Finish, Vented 0.38 SST #8-32 HCHU0832-038S40V
Screw, Cap Hardware, No Finish, Vented 0.56 SST #8-32 HCHU0832-056S40V
Screw, Cap Hardware, No Finish, Vented 0.88 SST #8-32 HCHU0832-088S40V
Screw, Cap Hardware, No Finish, Vented 1.25 SST #8-32 HCHU0832-125S40V
Screw, Cap Hardware, No Finish, Vented 0.38 SST #10-32 HCHU1032-038S40V
Screw, Cap Hardware, No Finish, Vented 0.56 SST #10-32 HCHU1032-056S40V
Screw, Cap Hardware, No Finish, Vented 0.75 SST #10-32 HCHU1032-075S40V
Screw, Cap Hardware, No Finish, Vented 1.5 SST #10-32 HCHU1032-150S40V
Screw, Cap Hardware, No Finish, Vented 0.88 SST 1/4-28 HCHU2528-088S40V
Screw, Cap Hardware, No Finish, Vented 0.5 SST 5/16-24 HCHU3124-050S40V
Screw, Cap Hardware, No Finish, Vented 1.25 SST 5/16-24 HCHU3124-125S40V

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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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