Metric & Imperial Thread Identifier

The Thread Detective
Fed up of struggling to identify bolt and nut threadforms? You need to buy our thread finder! The Thread Detective is a precise and easy-to-use thread identifier for both bolts and nuts, consisting of thread checkers conveniently assembled onto a wire lanyard. It is especially well suited for distinguishing between similar inch and metric thread types.

Identify thread types of Metric and Imperial Fasteners Quickly and Easily

The Combo Thread Detective has the following checking sizes:

UNC and UNF: 6-32, 8-32, 10-24, 10-32, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, 1/2-13, & 1/2-20,

Metric: M4x0.7, M5x0.8, M6x1.0, M8x1.0, M8x1.25, M10x1.0, M10x1.25, M10x1.50, M12x1.25, M12x1.5, & M12x1.75.


Aerospace Fasteners


Earlier this week we shipped this specially manufactured part to one of our Aerospace customers.

UNJEF = Unified National Extra Fine thread series with external thread controlled root radius offering superior performance and durability.

Thomas Smith Fasteners supplies products to various market sectors worldwide, including:

  • Oil & Gas
  • Nuclear
  • Power generation
  • Construction
  • Engineering
  • Defence
  • Agriculture
  • Automotive
  • Electrical
  • Offshore

If you have any questions or enquiries please get in touch with our sales team


Not your usual kind of bolt!

We recently received an order for 820pcs of this specially manufactured part.

What is a Conrod Bolt?

Bolt used for fastening connecting rod caps. The Conrod cap bolts must be subject to at least two screwing operations during the productive cycle of the engine and must therefore be engineered to guarantee a more constant distribution of the axial load.

If you have any special enquiries like this please get in touch with our sales team.

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Ribble Steam Railway Locomotive Restoration

One of our valued customers has kindly shared the current restoration project at Ribble Steam Railway which we are delighted to be part of!

We are proud to say we have a history of supplying various fasteners to the Heritage Rail sector.

Even going back to the days when Fred Dibnah used to regularly visit our workshop for fasteners when he was working on his steam engine.

In the last 20 years we have switched from furnace fired forges to induction heating, back then grade 8.8 (metric) and Gr S/R (imperial) was the limit on manufactured bolts, we can now produce high tensile grades up to 12.9 as well as many different materials such as Stainless Steels, Exotic Alloys, Super Duplex and Non-Ferrous.

Our machinery has also improved significantly which allows us to manufacture to a high specification. We offer CNC manufacturing in house, Cut & Roll Threading, plus Secondary Operations – Turning, Milling, Drilling and Grinding.

As you can see on the first image the boiler is being worked on and is at a specialist boiler smith. The chassis has also gone undercover for its final strip down. This is the current restoration project and we are excited to see the end result.

The Loco below is a 1930 petrol shunting engine manufactured by Howards of Bedford. This beauty worked at Ford Paper Works in Sunderland until 1970. We had the pleasure of producing and supplying parts for this restoration.


Huge Stocks & Onsite Manufacturing

Our vast product range ensures that we have the fastener to meet your needs.

From stock or rapid manufacture, Thomas Smith Fasteners has the range and expertise to supply virtually any kind of industrial fastener.

Along with Metric, UNC and UNF sizes, we specialise in harder to find BA, BSF & BSW threadforms.

Fasteners can be supplied in most materials, grades and surface finishes.

We supply parts to various different market sectors world wide

Do you have any restoration projects that require our help?

Please contact our sales team!


Telephone: 01942520260

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7/16 -20 UNJF X 1.312″ 12 POINT CAP SCREW INCONEL 718 TO AMS 5962

Another impressive Aerospace part UK manufactured to order, quoted and supplied by Thomas Smith Fasteners.

Our customer was supplied with 100pcs of 7/16 -20 UNJF x 1.312″ 12 Point Cap Screw Inconel 718 to AMS 5962 complete with a 3.1 cert.

What is AMS 5962?

AMS 5962 is a designation of Nickel Inconel 718, itself a nickel-chromium alloy with high strength, corrosion and oxidation resistance, and excellent tensile and impact strength at cryogenic temperatures.

Thomas Smith Fasteners supplies products to various market sectors worldwide, including:

  • Oil & Gas
  • Nuclear
  • Power generation
  • Construction
  • Engineering
  • Defence
  • Agriculture
  • Automotive
  • Electrical
  • Offshore

If you have any questions or enquires please get in touch with our sales team.

Contact Us – Thomas Smith Fasteners

Classic Car Restoration Kits

Thomas Smith Fasteners are one of the market leaders in the fastener industry.

We have many years experience supplying the Classic Car market and have supplied companies as well as enthusiasts all over the world.

If you need bolts and nuts for your Aston Martin, Austin, Bentley, Ferrari, Jaguar, MG, Morris, Riley, Rolls Royce etc we can help!

We offer Mixed packs of bolts, nuts and washers in a handy, durable case.
Metric, BSW, BSF, UNC, UNF threadforms available.

Assorted Fastener Packs – Online Shop – Thomas Smith Fasteners

Classic Car Assorted Packs – Online Shop – Thomas Smith Fasteners

Contact Us – Thomas Smith Fasteners

New Van Day!

Check out Thomas Smith Fasteners new van!

We are here to service all your needs and offer free local deliveries.

We also have an online shop which gives you a small snapshot of the type of products we can offer.

Online Shop | Nuts, Bolts, Fasteners, Metric & Imperial – Thomas Smith Fasteners

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