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Non-Standards Are Our Standard

Bolts and Fasteners Manufactured in Exotic Alloys

Here at Smith Bullough, we offer bolts and fasteners in exotic materials with short production lead times.

Materials and Grades

At Smith Bullough, we manufacture fasteners in the following exotic materials and grades:

Exotic AlloysHastelloy
Super Duplex
ASTM A453 / A453M 660
Hastelloy C276 / C22
Monel 400 / K500
Inconel 600 / 601 / 625 / 718
UNS 32760
660A / 660B 660C / 660D


We manufacture fasteners in a wide variety of exotic materials at our purpose-built machining facility. Decades of experience, coupled with investment in cutting-edge technologies, ensures the highest standards and means that we are constantly expanding our product range and capabilities. Whatever your requirements, we will work with you to provide an appropriate solution. Products include:

  • Hexagon bolts and set screws
  • Stud bolts
  • Engineer studs
  • Socket cap screws
  • Socket set screws
  • Socket countersunk screws
  • Nuts
  • Washers
  • Machined parts
  • Specials to drawing


Inconel is a nickel-iron-chromium alloy.

High tensile strength, resistance to pitting and crevice corrosion as well as high corrosion fatigue strength are properties that make Inconel ideal for usage in seawater applications.

Outstanding corrosion resistance under a range of temperatures and pressures is a key reason why Inconel is also widely used in the aerospace, nuclear and chemical processing industries.


Inconel fasteners are in regular use within the following sectors:

  • Aerospace
  • Nuclear
  • Chemical Processing
  • Oil & Gas


  • Aircraft
  • Propeller shafts
  • Plant equipment
  • Chemical processing equipment
  • Gas turbines


Hastelloy® is an extremely versatile nickel-chromium-molybdenum alloy that offers excellent resistance to pitting and cracking corrosion.

The Molybdeneum content ensures that Hastelloy is strong at high temperatures, making it ideal for welding applications.

Hastelloy is also used in a variety of chemical environments, as it offers exceptional resistance to corrosion from both oxidising and non-oxidising acids.


Excellent corrosion resistance coupled with toughness at high temperatures means that Hastelloy fasteners are used across a wide range of industries, including:

  • Chemical Process Industry
  • Nuclear
  • Oilfield


  • Reactors
  • Pressure vessels
  • Heat exchangers
  • Columns


 A nickel-copper alloy, Monel offers high strength, weldability and excellent corrosion resistance in many environments, including seawater, hydrofluoric acid, sulphuric acid and alkalis.

Monel is tough over a wide range of temperatures, offering good mechanical properties at subzero temperatures and can be used in temperatures as high as 1000F.

Corrosion resistance is broadly similar to nickel, but Monel offers higher maximum working pressures and temperatures alongside improved machining ability.


Due to superior corrosion resistance and toughness over a wide temperature range, Monel 400 fasteners and bolts are used across a wide array of industries.

  • Marine
  • Chemical Processing


  • Chemical processing equipment
  • Valves and pumps
  • Gasoline and freshwater tanks
  • Pumps and propellor shafts
  • Boiler feed water heaters and heat exchangers
  • Electronic components

Contact The Experts

For more information or to discuss an order, contact Smith Bullough today.

Call us on 01942 520 250 for a free, no-obligation quotation.

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