Category Archives: Bespoke Bolts

Bespoke Bolts, Bespoke Fasteners, Thread data, Thread Forms, Thread Protection

High-Performance Fasteners: The Ultimate Thread Form Guide

Essential thread types for high performance fasteners

Understanding thread types is critical for selecting fasteners that meet performance, safety, and compatibility requirements. This guide outlines the most common thread systems used in bolts, nuts, and studs—including Metric, Unified, UNJ, UNR, and Whitworth forms.

For over 50 years, Hague Fasteners has manufactured precision threaded fasteners in steels, stainless steels, and superalloys. Therefore, we know how thread selection affects strength, fatigue life, seal integrity, and interchangeability.

How to Identify a Thread

  • System: Metric ISO, Unified, Whitworth, Pipe, Trapezoidal, Buttress
  • Diameter and Pitch: Metric uses mm pitch; Unified/Whitworth use TPI (threads per inch)
  • Series: Coarse, Fine, Extra Fine, Special
  • Class of Fit: Metric (6g, 6H); Unified (1A/1B to 3A/3B)
  • Form Geometry: ISO/Unified 60°, Whitworth 55°, UNJ/UNR radiused root, ACME 29°, Trapezoidal 30°
  • Hand/Starts: Right or left-hand, single or multi-start

Metric & Metric Fine Threads (ISO, 60°)

Metric threads use pitch in millimetres. Coarse “M” is standard. Fine “MF” improves preload control and engagement in thin sections.

Size Coarse Pitch (M) Common Fine Pitches (MF) Angle Notes
M6 1.0 0.75 60° General purpose
M8 1.25 1.0 60° Machinery, structures
M10 1.5 1.25, 1.0 60° Better clamp control
M12 1.75 1.5, 1.25 60° Thin sections
M16 2.0 1.5, 1.0 60° Vibration resistance
M20 2.5 2.0, 1.5 60° Flanged joints
M24 3.0 2.0, 2.5 60° Pressure boundary
M30 3.5 2.0, 2.5, 3.0 60° Large studs

FAQs on Metric Threads

  • What’s the difference? Metric Fine has smaller pitch for better preload control.
  • When to use MF? Thin walls, short engagement, vibration resistance.
  • Same angle? Yes—both use 60° flank angle.

Unified Threads UNC & UNF (ASME B1.1, 60°)

Size (inch) UNC (TPI) UNF (TPI) Angle Notes
1/4 20 28 60° General fixtures
3/8 16 24 60° Preload control
1/2 13 20 60° Structural fasteners
5/8 11 18 60° Studs, couplings
3/4 10 16 60° Pressure equipment
1 8 12 60° Heavy joints

FAQs on UNC & UNF Threads

  • What’s the difference? UNC is coarse, easier to assemble. UNF is fine, better clamp control.
  • Which is stronger? Depends on application—UNC for depth, UNF for engagement.
  • Same angle? Yes—60° flank angle.

UNJ & UNR Threads (ASME, 60°)

UNJ threads feature a controlled root radius for improved fatigue strength. UNJC is coarse pitch, UNJF is fine pitch. UNR is a rounded-root version of UNC/UNF.

FAQs on UNJ & UNR Threads

  • UNJ vs UNJF? UNJF is fine pitch within the UNJ family.
  • UNJC vs UNJF? UNJC is coarse pitch, same root radius.
  • What is UNR? Easier to roll, less controlled than UNJ but fatigue resistant.
  • Where used? Aerospace, defence, rotating equipment.

Whitworth Threads BSW & BSF (BS 84, 55°)

Whitworth threads use a 55° flank angle with rounded crests and roots. BSW is coarse; BSF is fine.

FAQs on BSW & BSF Threads

  • BSW vs BSF? BSF has finer pitch for thin sections.
  • Interchangeable? No—Whitworth differs from Metric/Unified.
  • Where found? Legacy British equipment, restoration, heritage plant.

Get in Touch

Contact Hague Fasteners today for a custom quote or technical consultation.

Hague Fasteners Limited do not take any responsibly for any information used

Bespoke Bolts, Bespoke Fasteners, Bolt and Nut Manufacturing, Custom Fasteners, Non Standard Fasteners, Special Fasteners, Uncategorized

UK made Custom Transport Fasteners for Rail and Vehicle use

At Hague Fasteners, we engineer and manufacture specialist fasteners for the transport sector- supporting rail, automotive and military vehicle applications with precision, compliance and durability.

Hague Fasteners are the reliable source for transport fasteners.

Rail Industry Expertise

We supply custom fasteners for rolling stock refurbishment and infrastructure maintenance across the UK rail network, including London Underground. Our components are trusted in:

  • Track component upgrades
  • Vintage steam engine restoration
  • Holding down and anchor bolt installations

Automotive Fasteners: Metric & Imperial

Our automotive-grade fasteners include:

  • Wheel studs and wheel nuts
  • Fine pitch hexagon head bolts
  • High tensile, galvanised, zinc-plated, phosphated, and chemically blackened finishes

Moreover, we manufacture in both metric and imperial inch sizes, ensuring compatibility across legacy and modern vehicle platforms.

Ancillary Transport Sectors We Serve

  • Rolling stock refurbishment
  • Rail infrastructure maintenance
  • Vintage and specialist vehicle producers
  • Military vehicle manufacturers
  • Automotive component suppliers
  • Track component manufacturers

Fastener Types We Manufacture

Common ApplicationsFastener Types
Rail & AutomotiveWheel Studs, Track Bolts, Plow Bolts
InfrastructureAnchor Bolts, Holding Down Studs, Fish Bolts
Specialist VehiclesBi-Hex Bolts, Torx Screws, Socket Capscrews
General EngineeringU Bolts, J Bolts, Nyloc Nuts, Locknuts, Milled Components

Materials & Grades

We work with a wide range of certified materials, for example:

  • Carbon Steels: ISO 898 Grades 8.8, 10.9, 12.9, 14.9
  • Engineering Steels: EN3A, EN8, EN16T, EN19T, EN24T
  • Construction Steels: S235, S275, S355, S355JR
  • Stainless Steels: AISI 303, 304, 316, 316L, A2 & A4 (Classes 70 & 80)

Why Choose Hague Fasteners?

  • Small batch specialists with rapid turnaround
  • UK-based manufacturing with full traceability
  • Custom designs for legacy and specialist transport systems
  • Compliance with industry standards and material certifications
Precision-engineered fasteners for rail, automotive, and military transport systems

Get in Touch

Ready to source precision fasteners for your transport project? Contact Hague Fasteners today for a custom quote or technical consultation.

Bespoke Bolts, Bespoke Fasteners

Bespoke Fasteners

Bespoke Fastener

Bespoke Fasteners are our speciality.

Hague Fasteners are your solution for any Bespoke Fasteners or Custom Precision Engineered Components.

sposAs specialist manufacturers, all of the items we supply are made to order.

We are a major manufacturer of all specialist Bolts & Nuts, we will be more than happy to quote against your specific enquiries. We assume, of course, that they are not a standard imported sizes that are available from a standard merchant.

Our forte is special high integrity items in critical material grades manufactured to international standard or Bespoke Fasteners and components produced to customer or OEM designs & drawings.

We are experts in the real low quantity manufacturing of special fasteners to customers designs and drawings, or relatively standard items but in non-stocked materials.

We supply heavily to all sectors of Engineering Specialists and General Engineering Merchants where they need a solution for nuts and bolts that are not available form the imported distributors.

We are literally talking about quantities such as 5pcs 10pcs 50pcs and so on, not hundreds and thousands.

Hague Fasteners are on hand to manufacture any special bespoke fasteners you may need.

Bespoke Fasteners
Bespoke Bolts, Custom Bolts & Nuts, custom made bolts and nuts, Fasteners, Hague Fasteners, non-standard fasteners, Non-standard socket screws, Socket capscrews, Special Fasteners, Tappex Inserts

Small Quantity Manufacturing Without Idle Claims

Countless companies offer bold claims like “if its standard we stock it, if its non-standard we stock it too”.

Here at Hague Fasteners we offer a simple and substantiated claim. If its not available from stock we will manufacture Bespoke Bolting for you in whatever delivery time you need.

There is no way anyone can stock special hex bolts, nonstandard socket screws or custom hex nut that’s not even designed yet, but once you’re happy with your specification you can source it from Hague Fasteners, manufactured to order, often as fast as if it were in stock, if required.

Being in the Special Fasteners industry for over forty years we know almost everyone claims they can make any specials that are beyond the standard stocked range. The reality unfortunately is not always quite so simple.


That fine thread BSF to UNF Tapping Thread Adaptor that’s non-standard, sure it can be made for you by standard stockists but do you really want to order 50,000pcs and wait 20 weeks? Just last week Hague Fasteners produced and supplied 4 off 1/2″ / M18 Tappex type self cutting thread adaptors in stainless steel in just a few days.

Hague Fasteners have decades of manufacturing expertise producing small quantity special components to all industries around the World, from Major Multi National Corporations to Small Self Employed Operators such as Modern Artists, Entrepreneurs Prototyping or Small Racing Engine Tuning experts.


We are proud to have worked on a Manifold bolting solution to a Private Raceteam this month that solved a failing bolted connection at high temperatures and secured Pole Position, a record lap time, and a First Place Podium Finish.

Small Quantity Bolting Solution Providers since 1971.
No idle claims just real results.

Bespoke Bolts, Custom Fasteners, Engineer studs, Fastener Manufacturers, Hague Fasteners, non-standard fasteners, Power Generation, Special Fasteners, studbolt, Studbolts, Tie Bars, UK Manufacturing, waisted studbolts

Experts in Manufactured Engineer Studs Since 1971

For over 4 decades, Hague Fasteners have excelled in the quality manufacturing of Engineer Studs.


From small diameter engineer studs for automotive use through large diameter High Pressure Turbine Casing Engineer Studs used in Power Generation facilities all around the World, Hague have the capacity to serve your Special Manufactured Fastener needs.

What is an Engineer Stud ?
There are various key identifiers when it comes to specifying an Engineer Stud. Many international standards exist and Hague can manufacture to the dimensions required under all standards or indeed a bespoke special stud can easily be made to your unique requirements and drawings.


The Metal End is the Stud End that is screwed into the existing component base or body. This is generally 1 or 1.5 times the nominal diameter as specified by purchaser or international standard.
TheNut End is the Stud End which is not screwed into the existing component. A nut is tightened into this shorter threaded end to secure the fixing.
The Plain portion is the part of stud which is not screwed. This shall be greater than 50% of the nominal dia and normally includes thread runouts.
Nominal length- The British Standard BS4439 identifies a range of Nominal lengths from 12mm to 500 mm. The nominal length is the plain portion length & the Nut Threaded End added together.
d – Hague regularly manufacture Engineer Studs in the diameter range M6 (1/4″) through M100 (4″).
Threads Notes
According to the BS4439 standard the threads on the nut end and on the metal end shall be in accordance with BS 3643 parts 1-3. The nut end shall be to the tolerance 6g (medium fit.). This is as normal for a general bolt. The metal end shall be to the tolerance of a close fit (4h) or an oversize tolerance as specified.
The tapped hole shall be to the tolerance 4H or, if it is not critical application a medium 6H tolerance can apply.
Be sure to give the Stud Experts a call with your next Engineer Stud requirements. Hague Fasteners are ready to manufacture for you.

Bespoke Bolts, Fasteners, Hague Fasteners, non-standard fasteners, Special Fasteners, UK Manufacturing

Special Fasteners Image Gallery

As part of our impressive Website relaunch we are excited to introduce our:-
Photo Gallery Of Special Bolting

This exciting ongoing presentation shows a large selection of the high integrity special fasteners and custom bolting manufactured by Hague Fasteners Limited.
The gallery is constantly updated with new photographs of Hex Bolts, Engineer Studs, and a wide array of Special Turned Parts manufactured in the UK by Hague Fasteners for Worldwide Engineering Industries.
Be sure to take a look at the Live Fastener Gallery and revisit often to see a large selection of the infinite product range that are impossible to catalogue.