Spectro Chemical Analysis

The chemical composition of the raw material that is used to produce a fastener is all important. We are one of the few fastener companies who have an in house capability to undertake material analysis.

Our Spectromax metal analyser has recently been serviced and calibrated to a wide range of materials, including carbon, alloy and stainless steels.

We were delighted to be informed that the results were very consistent and accurate, with our analyser passing with flying colours!

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New 75 KVA Induction Heater for Bolt Forging

induction heater hot forged bolts

These images show details relating to our new induction heater being explained to Barry Taylor, Forging Manager, by the commissioning engineer from Ambrell.

induction heated special bolt forging manufacturer

This unit will significantly increase our forging throughput and ensure that we maintain our position as the leading domestic manufacturer of special bolts in all grades of steel, stainless steel and non-ferrous materials.

For more information, please do not hesitate to contact us.

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Special Fastener Manufacture – M12 x 505 Hex Bolts 8.8 BZP

long bolts, m12 x 500, special bolts, bolt manufacture

Our expertise in the manufacture of special and difficult to manufacture bolts was recognised and we produced the bolts pictured above for use by a multinational manufacturer of offroad vehicles.

The bolt illustrated above is M12 diameter x 505mm long, which was forged in our factory and then heat treated to achieve the mechanical properties grade 8.8. Due to the relatively small diameter and the long length of more than half a metre, distortion of the bolt shank is inevitable during the heat treatment process.  This required us to check and 100% rectify the batch using a hydraulic press, which is a skilled operation.

The final operation involves a zinc plating process which provided the anti-corrosion properties that are required for the application.

For further information, contact our experienced technical sales staff and we’ll be happy to discuss your requirements.

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Special Fastener Manufacture – Large Diameter Pins (CNC Machining)

special pins large diameter manufacture

Here’s an example of our fastener manufacturing capabilities, which shows that not all our fasteners are threaded.

These 106mm x 220mm drilled pins were manufactured on a CNC machine in our onsite machine shop.

cnc manufacture special pins fasteners


The above picture shows the pin inside the CNC machine during manufacturing.  A hole is then drilled into the pin to accommodate an R Clip.

We have extensive fastener manufacturing capabilities and many years of experience in providing high quality fastener solutions.  As well as CNC machining, we offer extensive forging and threading solutions to meet your needs.

Alongside our special fastener manufacturing capabilities, we hold large stocks of finished bolts in metric and imperial threadforms.

We also carry an extensive range of bolt blanks, enabling us to rapidly meet your needs, however complex.

We can also perform chemical and mechanical testing in-house via our well-equipped quality control department.

Contact us to discuss any requirements you may have and we’ll be happy to help.

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Bolt Manufacturing for the Nuclear Industry

Smith Bullough were one of only half a dozen manufacturing companies that were invited to take part in a day seminar at the Nuclear Advanced Manufacturing Research Centre in Rotherham.

Nuclear AMRC is one of the CATAPULT High Value Manufacturing centres that the UK is establishing.

The visit, run under the Fit For Nuclear programme, included presentations on Advancing UK Nuclear Manufacturing and The Current Position & Opportunities, one to one sessions and a tour of the facility.


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Mach 12 Machine Tool Exhibition

The Mach 12 exhibition at the NEC is held every two years to showcase the machine tool industry and associated products.

The global, quality, and precision aspects of this industry were demonstrated by the number of Formula 1 cars on display.

Machining is an important secondary function that is of significant importance to us, especially when manufacturing specials.

Useful contacts were made with tooling and quality equipment suppliers.

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QA Dept video – Sorting mixed bolts using a Sorting Bridge

This video demonstrates the use of a Sorting Bridge in our QA Department.

A Sorting Bridge allows the user to separate mixed batches if items with equivalent dimensions but differing material types become mixed.

If the material of the sample matches the test piece, a sinusoidal waveform is produced.  If the material of the sample does not match the test piece, the waveform is inconsistent.

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Chemical Analysis onsite

Our recently acquired Spectromax metal analyser is now operational.

We are now able to analyse many material types including Carbon, Alloy, Stainless Steel & Aluminium.

Obviously, the chemical composition of the raw material that is used to produce a fastener is all important.

We are one of the few fastener companies who have an in house capability to undertake material analysis.

This Spectromax analyser will be an important addition to the equipment in our Quality department.


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