Category Archives: 254SMO

254SMO, Custom Fasteners, Duplex, Special Fasteners, Subsea

UNS S31254 Fasteners

The high integrity bolts and special fasteners that Hague Fasteners manufacture are often installed into highly aggressive environments.

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Anti-corrosion materials are therefore commonly specified where reliance on a surface coating is simply impractical.

The 6% Mo Duplex Stainless Steel materials are among the best stainless steels for use in water and seawater giving excellent service in some very aggressive environments.

This various special fasteners including Hex Bolts, Eng Studs, Studbolts, Hex Nuts and Socket Capscrews Hague manufacture in 6Mo (254Smo) stainless are often specified due to the following characteristics:

• Comparable pitting and crevice corrosion resistance (PREN > 40, akin to SuperDuplex Fasteners.
• Excellent resistance to strong acids.
• Excellent stress corrosion cracking resistance.
• Higher yield strength than standard stainless steels available in Class 70 and Class 80 Cold Worked strength grades.
• Good impact toughness at sub-zero temperatures (even tougher than SuperDuplex grades).
• A cost effective alternative to some of the more expensive nickel base superalloys.

Hague Fasteners are manufacturing all types of UNS S31254 Special Fasteners and supplying global industry sectors such as:

Pulp and paper, Water Desalination Facilities, chemical processing plant, chemical tanker transportation, heat exchangers & Tubing Condensers, metal refining, flue gas desulphurisation (FGD), structural subsea fastener components, offshore oil and gas equipment, submarines & aggressive food processing manufacturing lines.

Whatever your application, whatever your design, you can trust Hague to manufacture and deliver Special Fasteners on time.

Alternative Specifications include:-
254SMO, 6Mo, 6% Mo, 1.4529, 1.4547, N08926, UNS S31254, Duplex

254SMO, Duplex, Engineer studs, exotic materials, Hastelloy, Hex Nuts, Incoloy, Inconel, Monel, sales brochure, studbolt, Studbolts, Super Duplex, tie bar, Titanium, waisted studbolts, Washers, wheelstuds

Hague Fasteners Product Showcase: Studbolts

Standard studbolts are now widely available off the shelf in the more obvious ASTM grades such as B7, B7M, L7, L7M, B8 or B8M, but we continue to provide a unique manufacturing service of studbolts and ancillary products such as washers in the more exotic materials.



Recent projects have seen studbolts and threaded rod, complete with heavy hex nuts, to BS4882 or ANSI B16.5 and ANSI B18.2.2 or BS1769 respectively, being manufactured by us in the Duplex grade 254SMO (Also known under the specifications UNS S31254, 1.4547, X1 CrNiMoCuN 20-18-7 and F44).

Over the years we have produced studbolts and heavy hex nuts in a wide range of these Duplex and Super Duplex grades as well as in grades of Incoloy, Inconel, Hastelloy, Monel, Titanium and many other nickel-based critical alloys.



As we are not stockists of petrochemical grade studbolts and hex nuts we will not be able to compete with importers who buy their product in bulk quantities, but we are very competitive with any item that they do not have on their shelves or in their stock, particularly in these critical alloys and with rolled or screw-cut threads.

We can produce any type of studbolt:  threaded rod (DIN975 & DIN976), tie bar, waisted studbolts (DIN2510), engineer studs (DIN938) slotted studbolts & wheelstuds or to your specific drawings or sample pieces.  Please contact us for more details or view our sales brochure.