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Monel® Fasteners

(Monel® is a registered trademark of Special Metals Corporation)

MONEL was invented in 1905. In the early 1900’s it was used as roofing material and for countertops and sinks before the stainless steel was introduced in the 1950’s. Monel alloys are comprised of approximately two thirds nickel and one third copper. Monel alloys resist in a wide variety of environments & are used in sulfuric acid and hydrofluoric acid, and in various marine and naval applications involving contact with sea and fresh water.

18.8 (A2) STAINLESS STEEL SOCKET CAP SCREW #10-32 UNF X3/4

Common Applications for Monel® Fasteners

  • Marine and Naval Applications
  • Pumps
  • Valves
  • Shipbuilding
  • Chemical & Oil Processing
  • Heat Exchangers
  • Electrical

There are a number of pros for using Monel fasteners, such as high corrosion resistance to acids and alkalis, it’s formability, a high mechanical strength, as well as a relatively low cost.

However, Monel has some disadvantages as well. Monel alloys have tendency to work-harden quickly so the machinability of Monel is poor.

Monel® 400 Fasteners (UNS N4400)

Standard products (hex bolts, nuts, screws, threaded rods) readily available.

Common Trade Name: Monel 400, Alloy 400, NiCu 400 Alloy

UNS: N4400

Specification: ASTM B164, QQ-N-281

Approx. Room Temp. Mechanicals: UTS = 75 ksi; YS = 25 ksi;

Typical % Compositions Summary: Cu 28 – 34, Fe 2.5 max., Mn 2.0 max., Ni 63 min.

Corrosion Resistance: High strength and high toughness over a wide temperature range. Excellent resistance to many corrosive environments including hydrochloric.

Monel® 405 Fasteners (UNS N4405)

Standard products (hex bolts, nuts, screws, threaded rods) readily available.

Common Trade Name: Monel 405, Alloy 405, NiCu 405 Alloy

UNS: N4405

Specification: ASTM B164, QQ-N-281

Approx. Room Temp. Mechanicals: T = 79.8 ksi; Y = 34.8 ksi;

Typical % Compositions Summary: C .30, Cu 28 – 34, Fe 2.5, Mn 2.0, Ni 63.0, Si .50, S .025 – .06

Corrosion Resistance: The free-machining version of Monel alloy 400. A controlled amount of sulfur is added to the alloy to provide sulfide inclusions that act as chip breakers during machining. Other characteristics are essentially the same as those of Monel alloy 400.

Monel® K-500 Fasteners (UNS N5500)

Standard products (hex bolts, nuts, screws, threaded rods) readily available.

Common Trade Name: K-500, NiCuAl Alloy

UNS: N5500

Specification: QQ-N-286

Approx. Room Temp. Mechanicals: UTS = 160 ksi; YS = 115 ksi;

Typical % Compositions Summary: C .25, Ni + Co 63min, Ti .35 – .85, Cu 27 – 33, Fe 2.0, Si .50, Mn 1.5, S .01, Al 2.3 – 3.15

Corrosion Resistance: Monel Nickel-Copper-Aluminum alloy K-500 combines the excellent corrosion resistance characteristic of Monel alloy 400 with the added advantages of greater strength and hardness. Increased properties are obtained by adding Aluminum and Titanium to the Nickel-Copper base, and by heating under controlled conditions. The thermal processing used to effect precipitation is commonly called age hardening or aging.

The corrosion resistance of Monel alloy K-500 is similar to alloy 400 except in the age-hardened condition, alloy K-500 has a greater tendency toward stress-corrosion cracking in some environments.