Tag Archives: bespoke fastener manufacturing

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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Archive News

Expanding Capabilities: Hague Fasteners Invests in Advanced Multi-Axis NC Machines

At Hague Fasteners, we are thrilled to announce our latest investment in cutting-edge technology. Over the next eight weeks, three state-of-the-art multi-axis NC machines will join our production facility, complementing our recent addition of our new high-speed mill. These additions represent a significant leap forward in our ability to deliver precision-engineered fasteners tailored to your exact requirements.

New multi-axis NC machines enhance precision and efficiency at Hague Fasteners.

Commitment to Innovation and Excellence

Since our founding in 1971, Hague Fasteners has been committed to continuous improvement and innovation in bespoke fastener manufacturing. This investment reflects our dedication to staying at the forefront of the industry, providing our clients with the most advanced solutions to meet their needs.

Enhancing Precision with Multi-Axis NC Technology

The new multi-axis NC machines will allow us to achieve even tighter tolerances and greater complexity in fastener designs. Whether you require unique components for critical applications or modifications to standard designs, our enhanced machinery ensures unmatched precision and efficiency.

By expanding our technological capabilities, we are better equipped to handle complex and demanding projects while reducing lead times and maintaining the highest standards of quality.

Delivering Greater Value to Our Clients

Our ongoing investment in advanced machinery is part of our commitment to delivering exceptional value and service. We are excited to continue partnering with you on your bespoke fastener requirements, leveraging our enhanced capabilities to exceed your expectations.

Contact us today to discuss how our expanded capacity and expertise can support your upcoming projects.