Tungsten Button Head Cap Screws

Tungsten button head cap screws 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 screws radiopaque. This allows tungsten screws 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 button head cap screws 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 fasteners 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.

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Molybdenum Button Head Cap Screws

Molybdenum button head cap screws possess a very high melting point of 2620°C, a low coefficient of thermal expansion and a high level of thermal conductivity. Because molybdenum screws have the ability to withstand extremely high temperatures without changing shape, expanding or softening significantly, they are ideal for high strength / high temperature applications that are shielded from oxygen. Exposing molybdenum button head cap screws to oxygen above 600°C will cause them to readily oxidize. As a result, molybdenum button head cap screws find their way into high temperature vacuum furnaces, glass production, military and space applications where oxygen is not present.

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Incoloy Button Head Cap Screws

Not to be confused with Inconel, Incoloy button head cap screws are made of a nickel alloy which contains iron and a lower content of nickel. Incoloy is essentially a more economical option to Inconel, yet with more restricted corrosion resistance and temperature limits. Typically, Incoloy is an ideal material for long-term exposure in high temperature environments due to its oxidation, carburization and creep resistance. Incoloy is widely used for its resistance to seawater, brine, sour gas and high chloride environments at elevated temperatures, which make it a popular choice in the oil and gas and power industries.

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Waspaloy Button Head Cap Screws

Waspaloy button head cap screws are known for their superb high strength at elevated temperatures. Waspaloy is a high performance nickel alloy combined with cobalt, chrome and molybdenum to create it’s unique combination of strength and high temperature stability. Similar to that of Inconel 718 screws, Waspaloy button head cap screws exceed the strength and stability of Inconel 718 at elevated temperatures beyond 1400°F. In addition, the oxidation resistance of Waspaloy screws make it an ideal materials for high temperature applications like gas turbines engines, and a variety of other aerospace components.

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Alloy 330 Button Head Cap Screws

Alloy 330 button head cap screws are specifically designed for high temperature furnace applications such as vacuum furnaces, heat treating and brazing applications. The most prized trait of alloy 330 is its ability perform under cyclic conditions of temperature extremes from heating and cooling; as well as in alternate carburizing and oxidizing atmospheres. An austenitic, nickel-chromium-iron-silicon alloy, 330 button head cap screws also offer industry a low coefficient of expansion, excellent ductility, and high strength.

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Alloy 20 Button Head Cap Screws

Also known as Carpenter 20 and 20CB-3, Alloy 20 button head cap screws offer users a combination of nickel, chromium, molybdenum, and copper which provides good general corrosion resistance. Alloy 20 button head cap screws are best suited for mid-range corrosion use – better than steel alloys but not at the level of high performance nickel based alloys like Hastelloy C276. Alloy 20 is a nickel alloy that was specifically designed to withstand the harsh environment of hot sulfuric acid but also performs well in a variety of other acids. Alloy 20 button head cap screws are an ideal choice when you don’t need the corrosion resistance power and price-tag of high performance nickel alloys like Hastelloy C276; but you need something that will give you more protection than 316 stainless steel or even a Super Duplex 2507 stainless steel.

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A286 Button Head Cap Screws

A286 button head cap screws or alloy 660 stainless steel button head cap screws are known for their high strength, creep resistance and oxidation resistance at elevated temperatures. This iron-nickel-chromium alloy (once age-hardened) provides A286 screws with high levels of strength from room temperature up to about 1300°F (700°C). A286 button head cap screws are mildly corrosion resistant. While they should not be used for strong acid environments, they provide excellent oxidation resistance up to 1300°F (700°C) in conditions that would typically be found in high temperature exhaust streams. Because of these properties, A286 button head cap screws are often found in high temperature engine, manifold, exhaust and turbine applications as well as off-shore oil & gas applications.

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17-4 PH Button Head Cap Screws

17-4 PH button head cap screws are made from a precipitation hardened stainless steel most known for its exceptional strength and its ability to maintain its mechanical properties to 600°F. Compared to 316 stainless steel, 17-4 PH screws yield strength is up over 4 times greater. When compared to Duplex 2205 screws, the yield strength of 17-4 PH can be up to 2-½ times greater. 17-4 button head cap screws are available in 8 different aged (precipitation hardened) conditions offering a variety of mechanical properties.

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