Tungsten Hex Bolts

Tungsten Hex 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 fasteners radiopaque. This allows Tungsten Hex 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 fasteners make them ideal for some of the hottest vacuum furnace environments. Beyond their high mass and temperature stability, tungsten fasteners are also very corrosion resistant.

Tungsten Hex 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.

Ultra-high density & high temperature / strength stability

• Very 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 fasteners

• Tungsten material datasheet

Applications

• The aerospace industry depends on the tungsten fasteners 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 fasteners in high temperature vacuum furnaces due to tungstens great high temperature strength & stability.

• The oil & gas industry uses tungsten fasteners 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 fasteners 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

Custom Availability

• Diameter sizes:  Standard #00 – 4” in diameter / Metric M1.2 – M100

• Threads: UNC, UNF, UNJ, UNR, Rolled,Cut

• Minimum Volume – Typically 10pcs, depending on size and stock

• Custom to print

Tungsten Hex Head Bolt Features and Benefits

It is important to differentiate between a Incoloy hex head bolt and hex head cap screw. Often people assume they are the same, but they are actually very different fasteners in terms of how they are manufactured, as well as from an application perspectiv. Regardless of your choice, tungsten hex heads offer strong, stable joints because of their large head service. 

The Hex Comparison

Tungsten Styles

Tungsten Screws

12 Point Screws	Tungsten 12 point screws allow for higher torque to be applied than a socket head cap screw or head head bolt, however they are be less economical due to the complex head design. Available in 1/4" or larger sizes.	•  IFI-115 •  MIL SPEC •  DIN 34822 •  DIN 34821
Button Head Cap Screws	Tungsten button head screws offer a wide clamping area and low profile. They are best for fastening material that is too thin to counter bore.	• ASME B18.3 • ASME 18.3.4M • DIN 7380 / ISO 7380
Flat Head Screws	Tungsten flat head screws are most commonly offered in an 82° countersink angle, but can be customized to other angles from 60° -120° and are designed to be flush with the surface.  Available in slotted and socket drivers. Phillips, 6-lobe, torx and tamperproof drivers in Tungsten flat head screws can be made require special manufacturing.	•  ASME B18.3 •  ASME B18.3.6 •  DIN 963 / ISO 2009 •  DIN 965 / ISO 7046 •  DIN 7991 / ISO 10642
Hex Head Cap Screws	Tungsten hex head cap screws offer the added washer face to the bolt head which is lacking on a hex bolt and tighter dimensional tolerances. Ideal for a high clamping force applications with ease of access. Generally availabe in #2 - 1/2" sizes and metric sizes.	• ASME B18.6.3 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017 • DIN 961 / ISO 8676
Pan Head Screws	Tungsten pan head screws offer a rounded top are best used for small diameter faster needs. Offered in slotted and they are ideal for low torque applications.	• ASME B18.6.3 • DIN 7985 • DIN 921 • DIN 85 / ISO 1580 • DIN 84 / ISO 1207   (cheese head) • DIN 966 / ISO 7047   (raised counter sunk)
Security Screws	Unique driver designs offer these Tungsten screws resistance to unwanted tampering or removal due to the fact that they cannot be removed using an ordinary driver. Tungsten security screws are available in several different drive styles, as well as custom per print.
Set Screws	Tungsten set screws are available in cup, cone, flat, dog and half-dog points. Set screws have no head and are equiped with a socket or slotted driver at one end.	• ASME B18.3 • DIN 913 / ISO 4026 • DIN 914 / ISO 4027 • DIN 915 / ISO 4028 • DIN 916 / ISO 4029
Socket Head Cap Screws	Tungsten socket head cap screws are ideal for limited access situations where there is little clearance around the screws. They offer a safe, reliable and economic solution.	• ASMET B18.3 • DIN 912 / ISO 4762 • DIN 7984
Vented Screws	Tungsten vented screws are best for vacuum environments because the hole drilled through its axis (from head through threads) allow gases and other contaminents to vent. Tungsten vented screws are available in any style.

Tungsten Bolts

Tungsten Nuts

Tungsten Studs & Threaded Rods

Tungsten Washers 

Tungsten Chemistry & Specifications

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