🪙 TUNGSTEN

Tungsten & Tungsten Alloy Machining in Seattle, WA

Tungsten gets specified for two extreme properties: it is nearly twice as dense as lead and among the hardest, highest-melting metals known. In Seattle that translates to aerospace balance and counterweights, vibration-damping mass, radiation shielding, and defense components where density does the work. It is a specialty material with a narrow qualified supplier base, because pure tungsten and tungsten carbide demand grinding and EDM rather than conventional machining, while tungsten heavy alloys are more workable.

AS9100ISO 9001ITAR
Tungsten's headline property is density, roughly 19 grams per cubic centimeter, far beyond steel or lead, which makes it the material of choice when you need maximum mass in minimum volume. In aerospace that means control-surface and rotor balance weights, counterweights, and vibration-damping masses where packing weight into a tight space matters. Its high atomic number also makes it an effective radiation shield, replacing larger volumes of lead. Defense applications exploit the density for penetrators and kinetic components. The second property is hardness and wear resistance, especially in tungsten carbide, used for cutting tools, wear parts, and dies. The form you need drives everything downstream: tungsten heavy alloy (a sintered tungsten-nickel-iron or tungsten-nickel-copper composite, often 90 to 97 percent tungsten) machines far more readily than pure tungsten or carbide and is the usual choice for balance weights and shielding, while pure tungsten and carbide are processed by grinding and EDM. Tell the supplier which property you are after, because it determines the material and the entire process route.

Why the Supplier Pool Is Narrow and How to Vet It

Pure tungsten is hard and brittle and tungsten carbide is harder still, so neither can be conventionally turned or milled; they are shaped by grinding, wire and sinker EDM, and sometimes by pressing and sintering to near-net shape before finishing. This rules out general machine shops. Tungsten heavy alloys, being a more ductile composite, can be machined with carbide tooling, rigid setups, and patience, but they are still abrasive and demanding. That means the qualified Seattle supplier pool is small and specialized. When vetting, ask specifically which tungsten form and grade they have experience with, because experience with heavy alloy does not transfer to carbide grinding and vice versa. Confirm the relevant process capability, EDM and precision grinding for pure tungsten and carbide, or machining for heavy alloy. For aerospace and defense, confirm AS9100 and, given how much tungsten work is defense-related, ITAR registration. Because much tungsten is sourced as pressed-and-sintered blanks, also discuss how near-net the starting form is, since that drives both cost and the achievable tolerance.

Material Sourcing, Cost, and Documentation

Tungsten is expensive and the supply chain is concentrated, with much raw tungsten originating from a small number of global sources, so for defense work the origin and supply-chain compliance can matter, and lead times on specific heavy-alloy grades or sintered blanks can be significant. Engage the supplier early on material availability, because tungsten is rarely sitting on a local shelf in the form and size you need. For documentation, require material certification identifying the specific tungsten grade or heavy-alloy composition and density, traceable to lot, since density is often a functional requirement for a balance weight or shield. Require a certificate of conformance to the drawing revision and dimensional inspection of critical features. For balance weights, the mass itself may be the controlled parameter, so confirm the part is weighed and the mass documented to tolerance. For defense parts, confirm ITAR compliance and any required supply-chain documentation. Specify density, mass, and dimensional requirements clearly, because for a high-density part the mass and density are usually the point.

Frequently Asked Questions

These are three distinct materials with very different processing. Pure tungsten is the elemental metal, extremely dense, hard, brittle, and with the highest melting point of any metal; it is difficult to machine and is usually shaped by grinding and EDM. Tungsten carbide is a ceramic-metal composite of tungsten carbide particles bonded with a metal binder, typically cobalt; it is even harder, prized for cutting tools, dies, and wear parts, and is also finished by grinding and EDM rather than conventional cutting. Tungsten heavy alloy is a sintered composite, usually 90 to 97 percent tungsten with nickel-iron or nickel-copper binder, which keeps most of tungsten's high density while being far more ductile and machinable with carbide tooling, making it the usual choice for balance weights, counterweights, and radiation shielding. When sourcing in Seattle, identify which of these your application needs, because the material, the process route, and the qualified supplier are all different, and experience with one form does not imply capability with another.
Pure tungsten and tungsten carbide are too hard and too brittle to be turned or milled with conventional cutting tools the way steel or aluminum is; attempting it would chip the material and destroy tooling. Instead, these forms are shaped by abrasive and non-contact processes: precision grinding with diamond or CBN wheels, wire and sinker electrical-discharge machining (EDM), and frequently pressing and sintering powder to a near-net shape before finishing. That equipment and expertise sit outside the capability of a general machine shop. Tungsten heavy alloy is the exception; because it is a more ductile sintered composite with a metal binder, it can be machined with rigid setups, sharp carbide tooling, and conservative parameters, though it remains abrasive and demanding. So when you need a pure tungsten or carbide part, you must find a specialist with grinding and EDM capability, while a heavy-alloy balance weight can be handled by a capable machining shop experienced with the material. Always confirm the shop's experience with your specific tungsten form before committing.
The reason is density. Tungsten and tungsten heavy alloys are roughly twice as dense as lead and far denser than steel, so they pack the maximum amount of mass into the minimum volume. In aerospace, that property is exactly what a balance weight or counterweight needs: control surfaces, rotors, and rotating or oscillating assemblies often must be balanced or have mass added in a tightly constrained space where a lower-density material simply would not fit. Tungsten heavy alloy delivers this density while being machinable to precise dimensions, and unlike lead it is non-toxic to handle and far stronger, which matters for a weight that must be fastened and survive vibration and load. It is also used as compact radiation shielding for the same density reason, achieving a given attenuation in less thickness than lead. When sourcing a tungsten balance weight in Seattle, expect the mass itself to be a controlled, inspected parameter, since the function of the part is to provide a specific mass within a specific envelope.
Often, yes, for two reasons. First, a large share of tungsten machining is defense-related, balance weights, counterweights, shielding, and kinetic components for military programs, so the hardware or its technical data may be ITAR-controlled. In that case the supplier must be registered with the Directorate of Defense Trade Controls and restrict access to drawings and CAD to U.S. persons, so confirm ITAR registration when the work is controlled. Second, tungsten raw material supply is globally concentrated, with much of the world's tungsten originating from a small number of sources, so for defense programs the origin and supply-chain compliance of the tungsten can be a contractual requirement, and you should confirm the supplier can document an acceptable material source. Lead times can also be affected by this concentrated supply chain, so engage early on material availability. When you RFQ tungsten work for defense applications, state the ITAR and any supply-chain or material-origin requirements explicitly so non-compliant suppliers self-select out, and verify the qualified Seattle specialist can meet them before committing.

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Last updated: July 2026

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