Delta Fastener Corp. can provide a wide variety of Monel fasteners including; Monel nuts, Monel bolts, sockets, washers and more Monel Fasteners. If we do not have your Monel Fasteners in stock (Inch or Metric) we can have these manufactured to your specification.

Material Notes:

Monel is a trademark of Special Metals Corporation for a series of nickel alloys, primarily composed of nickel (up to 67%) and copper, with some iron and other trace elements. Monel was created by David H. Browne, chief metallurgist for International Nickel Co. Monel alloy 400 is binary alloy of the same proportions of nickel and copper as is found naturally in the nickel ore from the Sudbury (Ontario) mines. Monel was named for company president Ambrose Monell, and patented in 1906.[2] One L was dropped, because family names were not allowed as trademarks at that time.[1]


Compared to steel, Monel is very difficult to machine as it work-hardens very quickly. It needs to be turned and worked at slow speeds and low feed rates. It is resistant to corrosion and acids, and some alloys can withstand a fire in pure oxygen. It is commonly used in applications with highly corrosive conditions. Small additions of aluminium and titanium form an alloy (K-500) with the same corrosion resistance but with much greater strength due to gamma prime formation on aging. Monel is typically much more expensive than stainless steel.

Monel alloy 400 has a specific gravity of 8.83, an electrical conductivity of approximately 3.4% IACS, and (in the annealed state) a hardness of 65 Rockwell B.[3]


Aerospace applications

In the 1960s, Monel metal found bulk uses in aircraft construction, especially in making the frames and skins of experimental rocket planes, such as the North American X-15, to resist the great heat generated by aerodynamic friction during extremely high speed flight. Monel metal retains its strength at very high temperatures, allowing it to maintain its shape at high atmospheric flight speeds, a trade off against the increased weight of the parts due to Monel's high density.

Marine applications

Monel's corrosion resistance makes it ideal for marine applications such as piping systems, pump shafts, seawater valves, trolling wire, and strainer baskets. Some alloys are completely non-magnetic and are used for anchor cable aboard minesweepers,[4] housings for magnetic-field measurement equipment. In recreational boating, Monel wire is used to seize shackles for anchor rodes, Monel is used for water and fuel tanks, and for under water applications. It is also used for propeller shafts and for keel bolts. However, because of the problem of electrolytic action in salt water (also known as Galvanic corrosion), in shipbuilding monel must be carefully insulated from other metals such as steel.

The New York Times of August 12, 1915 published an article about a 215 foot yacht, "the first ship that has ever been built with an entirely monel hull," that "went to pieces" in just six weeks and had to be scrapped, "on account of the disintegration of her bottom by electrical action." The yacht's steel skeleton deteriorated due to electrolytic interaction with the monel.[5] In seabird research, and bird banding or ringing in particular, Monel has been used to make bird bands or rings for many species such as albatross that live in a corrosive sea water environment.[6] Monel is also used for safety wiring in the aircraft industry to ensure that fasteners cannot come undone.

Musical instruments

Monel is used as the material for valve pistons in some higher quality musical instruments such as trumpets, tubas and French horn rotors.

Directional Drilling

Monel drill collars are used in surveying oil wells. Monel collars are used in drilling directional wells which require the well to be steered. Their use permits faster and more accurate surveys, reduce hazards, and decreases the cost of drilling directional of controlled oil wells. The reduced cost comes from the ability of real time surveys from a MWD tool which has magnetometers built into them. The magnetometers if not surrounded by non-magnetic material (monel, inconel, Cu-Be, or non-magnetic stainless) will be unable to read the earth's magnetic field without interference and will give an incorrect reading.

Monel is very rarely used in present day directional drilling collars. They are still referred to as monel collars based on tradition and misinformation. Monel has been substituted with 316 and other non-magnetic stainless materials due to cost.

Different Alloys

Trade Name ASME P Group ASTM/AISI

Steel type

Monel 400 B 127, B 164 N04400
Monel 401 N04401
Monel 404 B 164 N04404
Monel K-500 B 865 N05500
Monel R-405 N04405

K-500 Alloy has similar properties to Monel 400 Alloy, but has the added feature of Age Hardening to achieve a higher strength and hardness, This is due to the addition of aluminium and titanium. K-500 Alloys strength is maintained to temperatures as high as 1200 F, yet stays tough and ductile to temperatures down to -423 F. Along with staying non-magnetic down to -210 F. A common specification for this is QQ N 286.

Information provided by Special Metals and Wikipedia.

Disclaimer: The dimensions listed are for reference only. Sizes not listed may be available off the shelf or can be manufactured to customer requirements.