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Enginereed Polymers  Advanced Ceramics   Specialty Metals

FASTENERS FOR EXTREME APPLICATIONS

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Enginereed Polymers  Advanced Ceramics   Specialty Metals

FASTENERS FOR EXTREME APPLICATIONS

  • FOCUS OF Special Fasteners China Inc.

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    ENGINEREED POLYMER, ADVANCED CERAMIC and SPECIALTY METAL
    fasteners for the most challenging applications.
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Advanced Materials

High performance materials for extremely corrosive, high temperature, light weight, non-conductive, high strength and ultra-pure applications.

Tungsten Bolts

Ultra-high density & high temperature / strength stability

  • Helicopter blade 1Very high density of 19.3 gm/cc
  • Radiopaque to x-rays and other radiation
  • High strength at extreme high temperatures (vacuum)
  • Excellent corrosion resistance
  • Mechanical properties of tungsten bolts
  • Tungsten material datasheet

Tungsten bolts are known for their extreme high density; because of this unique attribute, they are often used for balancing rotating parts. Tungsten’s high mass also makes these bolts radiopaque. This allows tungsten bolts to block radiation and show up well on x-rays – even better than lead. Another unique attribute of tungsten is its extrmely high melting point of 3420°C. The high temperature stability of tungsten bolts make them ideal for some of the hottest vacuum furnace environments. Beyond their high mass and temperature stability, tungsten bolts are also very corrosion resistant.

Tungsten bolts are usually made from tungsten alloys per ASTM B777, and range from 90% to 97% pure tungsten, alloyed with nickel and copper or nickel and iron. Fasteners can also be made from Commercially Pure (CP) Tungsten.

Applications

  • The aerospace industry depends on the tungsten bolts for their combination of high density and mechanical strength which allows them to reduce the physical size of components, offering greater control of weight distribution for propellers, inertial systems and fluid control systems to name a few.
  • The heat treating / furnace industry uses tungsten bolts in high temperature vacuum furnaces due to tungstens great high temperature strength & stability.
  • The oil & gas industry uses tungsten bolts for radiation shielding properties to protect equipment used in oil and gas detection, as well as down hole logging for density and ability to withstand intense hydrostatic pressure
  • Tungsten bolts also play a role in the medical community for their low magnetic properties as well as their radiopaque properties.

Resources: Tungsten Torque Specs

Tungsten Bolts: Hex Bolts, Shoulder Bolts


Tungsten Chemistry & Specifications

Tungsten Specifications: ASTM B777, Mil Spec T-21014D

Tungsten alloy chart Revised 6 28 18


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