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Incoloy Fasteners
Not to be confused with Inconel, Incoloy fasteners 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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Duplex Stainless Steel Fasteners
Duplex 2205 and Super Duplex 2507 (UNS S32205 / UNS S32750) stainless steel fasteners are characterized by their high yield strength, which is twice that of annealed austenitic stainless steels, like 304 and 316. In addition, Duplex steels offer improved corrosion protection compared to 300 series stainless, especially in terms of localized corrosion such as crevice and pitting, as well as stress corrosion cracking. In general, Duplex steel bolts are a great step up from 300 series stainless.
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The main difference between the Duplex alloys is that 2507 offers higher strength and better corrosion resistance compared to Duplex 2205.
• Duplex 2205 (1.4462): Higher strength and corrosion resistance than 300 series stainless.
• Super Duplex 2507 (1.4410): Improved corrosion resistance and strength compared to 2205. -
Aluminum 7075 Fasteners
Aluminum 7075 fasteners are most commonly used for their combination of high strength and low weight. Alloyed primarily with zinc, they exhibit strength that is comparable to many grades of steel at a fraction of the density. Aluminum 7075 can be tempered to several different conditions (including 7075-T6) which offers different levels of strength. Commonly used for high-stress aircraft parts, Aluminum 7075 bolts offer good fatigue resistance and toughness.
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Compared to aluminum alloy 2024, 7075 bolts are typically used in applications where high strength and low weight are critical, whereas 2024 is more suited for cyclic fatigue. When weighing their attributes against 6061 which is structural aluminum, 6061 offers better corrosion resistance and machinability, but does not have the same high strength as aluminum 7075 fasteners. -
Alloy 926 Fasteners
Alloy 926 (1.4529) screws are the perfect substitute for 316L when higher corrosion resistance is required without additional strength. Alloy 926 fasteners are considered a 6-Moly alloy (6 Mo or 6% Molybdenum) like sister alloys AL6XN and SMO 254. Within the class of stainless steels, these 6 Mo alloys are considered to be very corrosion resistant. Bolts made from Alloy 926 are a super-austenitic molybdenum stainless steel offering corrosion resistance comparable to Super Duplex 2507 but with slightly lower strength and cost. Almost identical in chemistry to 6 Moly alloys AL6XN and SMO 254, Alloy 926 is often chosen for paper plants, desalination and weak acid environements.
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In addition, Alloy 926 fasteners are also similar in composition to 904L, but with increased nitrogen and molybdenum providing Alloy 926 bolts improved general corrosion resistance as well as resistance to pitting and crevice corrosion. Because of Alloy 926 resistance to chloride stress corrosion cracking, it makes 926 fasteners ideal for use in desalination, and pulp and paper plants. This alloy is also good option for diluted sulfuric and phosphorus acid applications. -
Alloy 20 Fasteners
Alloy 20 fasteners, also known as Carpenter 20 and 20CB-3, offers a combination of nickel, chromium, molybdenum, and copper which provides good general corrosion resistance. Alloy 20 (2.4660) fasteners 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 fasteners 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 Fasteners
A286 (1.4980) fasteners, also known as Alloy 660 fasteners are stainless steel alloy which contains iron, nickel and chromium. A286 fasteners are known for their high strength, creep resistance and oxidation resistance at elevated temperatures once age hardened. As a result, A286 fasteners provide high levels of strength from room temperature up to about 1300°F (700°C).
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A286 fasteners are also mildly corrosion resistant. While they should not be used for strong acid environments, they provide excellent oxidation resistance up to 1500°F (815°C) in conditions that would typically be found in high temperature exhaust streams. Because A286 fasteners are used in high temperature applications where performance is critical, we can provide fasteners to ASTM A453 Grade 660 in order to ensure accurate standards for tensile and stress rupture properties. -
Inconel Button Head Cap Screws
Inconel® button head cap screws, like Inconel 600, 601,625,686,718 & 725 screws, are a family of nickel-chromium-molybdenum alloys used for their high strength at elevated temperatures and good corrosion resistance. Because of its high thermal stability, Inconel can be used in service temperatures ranging from cryogenic to 2200°F (982°C). The high alloy content of Inconel button head cap screws enable it to withstand a wide variety of severe corrosive environments. In mild environments, such as the atmosphere, sea water, neutral salts, and alkaline media, there is almost no attack to Inconel screws. In more severe corrosive environments the combination of nickel and chromium provides resistance to oxidizing chemicals, whereas the high nickel and molybdenum contents supply resistance to nonoxidizing environments.
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Inconel 12 Point Screws
Inconel® 12 point screws, like Inconel 600, 601,625,686,718 & 725 screws, are a family of nickel-chromium-molybdenum alloys used for their high strength at elevated temperatures and good corrosion resistance. Because of its high thermal stability, Inconel can be used in service temperatures ranging from cryogenic to 2200°F (982°C). The high alloy content of Inconel screws enable it to withstand a wide variety of severe corrosive environments. In mild environments, such as the atmosphere, sea water, neutral salts, and alkaline media, there is almost no attack to Inconel 12 point screws. In more severe corrosive environments the combination of nickel and chromium provides resistance to oxidizing chemicals, whereas the high nickel and molybdenum contents supply resistance to nonoxidizing environments.
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Inconel Shoulder Bolts
Inconel® shoulder bolts, like Inconel 600, 601,625,686,718 & 725 bolts, are a family of nickel-chromium-molybdenum alloys used for their high strength at elevated temperatures and good corrosion resistance. Because of its high thermal stability, Inconel can be used in service temperatures ranging from cryogenic to 2200°F (982°C). The high alloy content of Inconel bolts enable it to withstand a wide variety of severe corrosive environments. In mild environments, such as the atmosphere, sea water, neutral salts, and alkaline media, there is almost no attack to Inconel bolts shoulder. In more severe corrosive environments the combination of nickel and chromium provides resistance to oxidizing chemicals, whereas the high nickel and molybdenum contents supply resistance to nonoxidizing environments.
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