Tag Archives: nuts and bolts

Fastener Data, Hague Fasteners Company Information, Non Standard Fasteners

Advanced machine screw guide for UK engineers: A reliable resource

Understanding machine screw sizes is essential for anyone working with precision fasteners, whether in manufacturing, engineering, maintenance or repair. Even small differences in diameter can affect fit, performance and safety. Therefore, having a clear reference for fractional‑inch, decimal and millimetre equivalents is incredibly useful.

At Hague Fasteners, we regularly support customers who work across both imperial and metric systems. As a result, we’ve created a simple and accurate reference chart to help you convert fractional‑inch measurements into decimal and millimetre values with confidence

Why Machine Screw Size Conversions Matter

Machine screws are produced in a wide range of diameters, and many industries still rely on fractional‑inch sizing. However, drawings, OEM specifications and international standards often mix imperial and metric units. This means engineers frequently need quick, reliable conversions to avoid errors.

Accurate sizing helps with selecting the correct drill size, ensuring thread compatibility, avoiding tolerance issues, maintaining safety and performance, and reducing rework or material waste.

Machine Screw Size Conversion Chart

This chart provides a clear comparison and is designed to make fastener selection easier, especially when working across mixed measurement systems. For specific guidance on your application, please contact sales@haguefasteners.co.uk

Machine Screw Sizes

Size Number

000 00 0 1 2 3 4 5 6 8 10 12

Diameter

.034 .047 .060 .073 .086 .099 .112 .125 .138 .164 .190 .216

Hole Diameter

.040 .053 .066 .080 .094 .107 .120 .133 .146 .173 .198 .224
 

Decimal and Millimeter Equivalents of Fractional Parts of an Inch

Fraction Decimal Millimeter   Fraction Decimal Millimeter   Fraction Decimal Millimeter
1 1.0000 25.4000   21/32 0.6562 16.6687   5/16 0.3125 7.9375
63/64 0.984 25.0031   41/64 0.6406 16.2719   19/64 0.2969 7.5406
31/32 0.9688 24.6062   5/8 0.6250 15.8750   9/32 0.2812 7.1437
61/64 0.9531 24.2094   39/64 0.6094 15.4781   17/64 0.2656 6.7469
15/16 0.9375 23.8125   19/32 0.5938 15.0813   1/4 0.2500 6.3500
59/64 0.9219 23.4156   37/64 0.5781 14.6844   15/64 0.2344 5.9531
29/32 0.9062 23.0187   9/16 0.5625 14.2875   7/32 0.2188 5.5563
57/64 0.8906 22.6219   35/64 0.5469 13.8906   13/64 0.2031 5.1594
7/8 0.8750 22.2250   17/32 0.5312 13.4937   3/16 0.1875 4.7625
55/64 0.8594 21.8281   33/64 0.5156 13.0969   11/64 0.1719 4.3656
27/32 0.8438 21.4312   1/2 0.5000 12.7000   5/32 0.1562 3.9688
53/64 0.8281 21.0344   31/64 0.4844 12.3031   9/64 0.1406 3.5719
13/16 0.8125 20.6375   15/32 0.4688 11.9062   1/8 0.1250 3.1750
51/64 0.7969 20.2406   29/64 0.4531 11.5094   7/64 0.1094 2.7781
25/32 0.7812 19.8438   7/16 0.4375 11.1125   3/32 0.0938 2.3812
49/64 0.7656 19.4469   27/64 0.4220 10.7188   5/64 0.0781 1.9844
3/4 0.7500 19.0500   13/32 0.4062 10.3187   1/16 0.0625 1.5875
47/64 0.7344 18.6531   25/64 0.3906 9.9219   3/64 0.0469 1.1906
23/32 0.7188 18.2563   3/8 0.3750 9.5250   1/32 0.0312 0.7937
45/64 0.7031 17.8594   23/64 0.3594 9.1281   1/64 0.0156 0.3969
11/16 0.6875 17.4625   11/32 0.3438 8.7312   — — —
43/64 0.6719 17.0656   21/64 0.3281 8.3344   — — —

Supporting Precision Engineering

Whether you’re working on prototypes, small‑batch production or specialist fasteners to drawing, accurate sizing is essential. Hague Fasteners manufacture custom screws, bolts and non‑standard fasteners in both imperial and metric dimensions, ensuring full compliance with your specifications. Moreover, our team is always available to support you with sizing, conversions or bespoke fastener manufacturing.

If you need guidance or require custom fasteners, we’re here to help.

Contact us on email sales@haguefasteners.co.uk or call us and for further bolting guidance see HERE

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Technical Bulletins

Manufacturers of specialist custom made fasteners in duplex materials

Super Duplex Fasteners: Properties, Grades & Applications

Hague Fasteners have manufactured more special custom-made fasteners in Duplex and Super Duplex grades than in any other material. These alloys are chosen for their exceptional strength, corrosion resistance and reliability in demanding environments. Therefore, many industries prefer Duplex and Super Duplex grades over lean Duplex alternatives such as UNS S32101.

Why Industries Choose Super Duplex Fasteners

Super Duplex alloys offer a unique combination of high mechanical strength and excellent corrosion resistance. Moreover, they provide superior performance in chloride-rich environments where standard stainless steels may fail. As a result, they are widely used in offshore, petrochemical, subsea and high-pressure applications.

Super Duplex Alloy UNS S32750 (F53 / 1.4410 / Alloy 2507)

Outstanding Corrosion Resistance

Super Duplex Alloy UNS S32750 (F53 / 1.4410 / Alloy 2507) provides excellent corrosion resistance across a wide range of media. It offers outstanding resistance to pitting and crevice corrosion in seawater and other chloride-containing environments. For example, its Critical Pitting Temperature exceeds 50°C, making it ideal for aggressive offshore conditions.

Thermal and Mechanical Performance

UNS S32750 exhibits a low coefficient of thermal expansion and higher heat conductivity than austenitic stainless steels. Therefore, it is suitable for working temperatures up to 300°C. This combination of thermal stability and mechanical strength makes it a preferred choice for high-integrity bolting and fastener applications.

Industry Approvals and Standards

Listed in NACE MR0175 for sour service and approved by ASME for pressure vessel applications, Alloy 32750 is trusted across multiple critical sectors. Consequently, it is used in oil and gas, petrochemical, subsea, desalination and chemical processing environments.

Why Choose Hague Fasteners for Super Duplex Fasteners?

With over 50 years of UK bolt and nut manufacturing experience, Hague Fasteners are recognised as one of the most reliable producers of special fasteners in Super Duplex grades. We manufacture custom fasteners to OEM drawings, unique designs and non-standard specifications, including small batch quantities and rapid turnaround requirements.

Contact Us

If you require Super Duplex fasteners, custom bolts or non-standard components, our team is ready to help. We offer fast lead times, high-integrity materials and precision manufacturing.

Contact us today:

  • Contact Page
  • Live Chat on our website
  • Quick Enquiry Form
  • Phone or Email

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Custom Bolts & Nuts, custom made bolts and nuts, Materials, UK Manufacturing

Why Global Industries Trust Hague Fasteners for Special Fasteners

Hague Fasteners is a trusted special fastener manufacturer supplying high integrity components to global industries that demand absolute reliability. Since 1971, our family driven business has focused on producing bespoke fasteners in small to medium quantities, manufactured to international standards or to customers’ own designs and OEM drawings. Moreover, our commitment to Quality Assured British Manufacturing ensures every component is produced with precision, integrity, and full material traceability.

A Specialist Manufacturer for Critical Applications

We manufacture small quantities of custom bolting and special fastener components, supporting urgent breakdowns, specialist projects, and long term supply requirements. Therefore, clients across oil and gas, petrochemical, power generation, marine, construction, and defence rely on our expertise.

Special fastener material

Carbon & Alloy SteelsStainless SteelsSuperAlloys
& Duplex Steels		Non Ferrous
8.8—10.9—12.9-14.9
A307 A, B & C
070M20 (EN3B)
070M55 (EN9)
080M40 (EN8)
605M36 (EN16)
708M40 (EN19)
817M40 (EN24)
826M40 (EN26
ASTM A193 B7
ASTM A193 B5
ASTM A193 B16
ASTM A320 L7
ASTM A320 L43
BS4882 B16A
Durehete 900 (T22)
Durehete 950 (T31)
Durehete 1055 (T42)
Jethete XM19
42CrMo4
24CrMo5
21CrMoV57
303 304
18-8/A2 316/A4
A2-50 A2-70
A2-80
A4-50 A4-70
A4-80
321 310 347
422 410 416
420 431
ASTM A193 B8
ASTM A193 B8M
ASTM A193 B8T
BS4882 B8X
BS4882 B8MX
BS4882 B8TX
B8/B8M/B8T Class 2
ASTM A193 B8C
BS4882B6
BS6105 C3
17-4PH
FV520B
Nitronic 50
Nitronic 60
904L
Uranus B6		Ferralium 255
Monel 400
Monel K500
Inconel 600
Inconel 601
Inconel 625
Inconel 718
Incoloy 800HT
Incoloy 825
Hastelloy B2
Hastelloy C4
Hastelloy C22
Hastelloy C276
UNS S31803
UNS S31254
UNS S32750
UNS S32755
UNS S32760
ASTM A453 660
254SMO
Sanicro 28
Nimonic 75
Nimonic 80A
Nimonic 90
Carpenter 20

Aluminium Bronze
Aluminium Silicon Bronze
Phosphor Bronze
Manganese Bronze
Brass
Naval Brass
Copper
Cupro Nickel 70/30
Cupro Nickel 90/10
Hiduron 191
Marinel
Aluminium
Plastic
Nylon
PTFE
PEEK
Delrin

Flexible Batch Quantities

  • 1 piece
  • 5 pieces
  • 25 pieces
  • 100 pieces
  • Up to 500 pieces

We take a firm stance on quality and only use the very best materials. As a result, Hague Fasteners has earned a reputation as a reliable special fastener manufacturer for the highest integrity components.

A Heritage of Excellence Since 1971

Hague Fasteners was founded in 1971 with a clear philosophy: deliver exceptional quality backed by genuine family driven ethics and customer care. More than 50 years later, that philosophy still guides everything we do.

What Sets Hague Fasteners Apart

  • Same day quotations
  • Delivery status updates
  • Test certification free of charge
  • Experienced technical assistance
  • Dedicated customer service team
  • Massive archive of OEM drawings
  • Technical library of international standards
  • Global daily shipments for fast delivery

Furthermore, our long standing commitment to quality and service has helped us build lasting relationships with clients around the world.

Quality, Integrity, and Service at the Core

Every order, whether a single fastener or a full project batch, receives the same level of care and attention. Our team understands the critical nature of the components we manufacture. Therefore, we ensure every part meets the highest standards of accuracy, material integrity, and performance.

Hague Fasteners Factory
Hague Fasteners, Monmer Close, Willenhall, WV13 1JR

A Trusted Partner for Bespoke Fasteners Worldwide

From urgent breakdown replacements to complex OEM specified components, Hague Fasteners delivers precision, reliability, and service that global industries depend on. Consequently, we remain one of the UK’s most respected names in special fastener manufacturing.

Work With Hague Fasteners

If you require bespoke fasteners or support from a trusted special fastener manufacturer, contact Hague Fasteners. Our team is ready to assist with complex specifications, urgent requirements, and long term supply partnerships.

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British Stainless Steel Association, BSSA, Custom Bolts & Nuts, custom made bolts and nuts, Stainless Steel Fasteners

Proud Members of the British Stainless Steel Association

What It Means for Our Customers

Stainless steel plays a crucial role in modern engineering, and the organisations that support its development help shape the strength and future of our industry. Because of this, Hague Fasteners proudly maintain our membership with the British Stainless Steel Association (BSSA)- a leading body that champions the manufacture, use, and advancement of stainless steel across the UK and Ireland. Moreover, our renewed membership, now confirmed until December 2026, demonstrates our ongoing dedication to quality, collaboration, and continuous improvement within UK manufacturing and the wider stainless steel community. As a result, we remain closely connected to the standards, innovation, and expertise that continue to drive the industry forward.

A Strong Network Supporting the Stainless Steel Supply Chain

The BSSA brings together every part of the stainless steel supply chain, from raw material extraction through to production mills, processors, distributors, manufacturers, and recyclers. This broad community creates a powerful network of expertise and innovation, and it ensures stainless steel remains central to the UK and Irish economies. Moreover, the association provides members with technical support, training, education, and essential industry insights, helping companies like ours stay aligned with the highest standards in British stainless steel production and UK manufacturing excellence.

The Role of the BSSA in Today’s Industry

Based in Sheffield, the historic home of stainless steel, the BSSA acts as the voice of the sector. It offers marketing support, technical guidance, and access to vital industry information that strengthens the entire stainless steel community. As a result, membership goes far beyond a simple affiliation; it reflects a commitment to raising standards, improving best practice, and supporting the long term growth of stainless steel in today’s world. The BSSA Board reviews all applications quarterly and holds full authority over membership approvals, ensuring the association continues to represent the very best of British stainless steel expertise.

What Membership Means for Hague Fasteners

At Hague Fasteners, we take great pride in being part of this respected organisation. Our renewed membership reinforces our position as a trusted UK manufacturer and highlights our dedication to delivering high quality specialist fasteners to industries that rely on performance, reliability, and precision. It also strengthens our role within UK manufacturing, where stainless steel remains a cornerstone material for safety critical applications.

Our Expertise in Stainless Steel Fasteners

We specialise in manufacturing specialist fasteners, including special bolts, nuts, studs, and general fasteners in all stainless steel grades. Whether you need corrosion resistant components for offshore environments, high integrity fasteners for chemical processing, or bespoke items for extreme operating conditions, our team is ready to support your project. Stainless steel remains the material of choice across many sectors because of its superior corrosion resistance, durability, and long term performance — and we engineer every fastener to meet those expectations. This commitment ensures our customers receive the highest quality solutions within the British stainless steel supply chain.

How BSSA Membership Benefits Our Customers

Membership of the BSSA also gives our customers direct benefits. The association’s website includes a full directory of members, covering everything from mills and stockholders to processors and end users. This resource allows buyers, engineers, and procurement teams to explore the wider stainless steel supply chain, understand the capabilities of each company, and gain confidence in the quality and traceability of the materials they specify. Therefore, when you choose Hague Fasteners, you gain more than a manufacturer — you gain access to a wider network of trusted stainless steel experts who support the strength of UK manufacturing and the reliability of specialist fasteners.

Our Commitment to the Future

As we look ahead to the next phase of our membership, we remain committed to supporting the values of the BSSA: innovation, sustainability, collaboration, and continuous improvement. Stainless steel continues to play a vital role in modern engineering, and we are proud to contribute to its future through our work in British stainless steel, UK manufacturing, and the production of high integrity specialist fasteners.

Request a Quotation

If you require stainless steel nuts, bolts, studs, or any other specialist fasteners, please contact Hague Fasteners today for an immediate quotation. Our team will help you select the right materials and deliver fasteners engineered for performance in the most demanding environments.

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