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Vented Hardware Overview

Vented Hardware Overview

Vented hardware is specifically designed for high and ultra-high vacuum (UHV) environments, where minimizing outgassing and preventing virtual leaks are critical. At TFM, we supply a wide range of vented components — including bolts, nuts, and washers — engineered with axial or radial vent paths to release trapped gases from blind-threaded holes.

Why Use Vented Hardware?

In vacuum systems, standard fasteners can trap air or volatile gases within blind tapped holes. During pump-down, this trapped volume becomes a source of virtual leaks, delaying the evacuation process and compromising vacuum performance. Vented hardware solves this problem by allowing gas to escape quickly through engineered vent paths.

Key Features

  • Axial or Radial Vents: Precision-drilled holes allow efficient gas flow during vacuum evacuation.

  • Material Compatibility: Available in stainless steel (304, 316), titanium, and other vacuum-compatible alloys.

  • Thread Standards: Offered in both metric (M) and inch-based (SI) threads to suit global systems.

  • Cleanroom Ready: All vented fasteners are precision cleaned and packaged for immediate use in sensitive environments.

  • Optional Coatings: Anti-galling coatings like silver or MoS₂ available for high-torque or repeated assembly use.

Common Types of Vented Hardware

  • Vented Bolts (Metric & SI): Axially vented screws designed for UHV flanges and assemblies.

  • Vented Nuts: Slotted or cross-drilled to permit trapped gas escape during tightening.

  • Vented Washers: Used with vented bolts to maintain flat, even clamping while supporting outgassing paths.

  • Custom Vented Fasteners: TFM can manufacture to spec, including special materials, head styles, or vent geometries.

Applications

  • Semiconductor process equipment

  • Thin film deposition systems (PVD, CVD, ALD)

  • Analytical instruments (XPS, SEM, TEM)

  • Aerospace & cryogenics

  • Research laboratories and vacuum chambers

Why Choose TFM’s Vented Hardware?

TFM’s vented fasteners meet the demanding requirements of vacuum technology professionals. With precision machining, rigorous cleaning, and a broad selection of materials and sizes, we provide the performance and reliability critical to your vacuum operations.

Dimensional Drawings

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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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