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Solar power reduces carbon emissions in bolt manufacturing

28th October 2022

By: Leah Shelene Asaram

Features Reporter


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Fasteners manufacturer SA Bolt Manufacturers installed solar power at its facility, in Nigel, Gauteng to reduce reliance on coal-generated power, thereby also reducing its carbon emissions to achieve carbon neutrality by 2050, says SA Bolt Manufacturers MD Derek Cohen.

 “We have achieved significant cost savings and reduced our reliance on State-owned utility Eskom-supplied electricity.”

Cohen adds that, with the installation of solar power for the fasteners manufacturing process SA Bolt Manufacturers has been able to “consume less and produce more”.

He says fasteners are crucial in almost every hardware, equipment, engineering, manufacturing and automotive system: “An average automobile uses about 8 000 bolts.”

A bolt is a hardware device generally made from either carbon steel or stainless steel, and sometimes brass,  titanium and other special materials, depending on the application for which it will be used. These bolts are used to create permanent and nonpermanent joints.

SA Bolt Manufacturers produce a complete range of standard and specialised fasteners in carbon and stainless steel for applications including mining, construction, automotive, renewable energy and general industrial use.

Cohen says the company supplies stainless steel bolts in grades 304 and 316, which are manufactured using hot forging technology.

The heating used for the hot forging production process is provided by electrical induction, a method that accurately controls a uniform forging temperature and is environmentally clean.

He explains that all bolts are accurately designed using three-dimensional modelling and computer-aided design software, which ensure that critical manufacturing tolerances can be achieved.

Further, machine tooling is similarly designed and produced in-house, guaranteeing enhanced quality and compliance with applicable specifications.

Bolts are cut to length before being heated to the required temperatures by high-speed electric induction, after which the head is forged by shaping the softened material using customised presses.

Stainless steel bolts are generally produced using hex heads, socket heads or countersunk heads in diameters of up to 100 mm.

Cohen explains that the final dimensions are achieved by machining each bolt, prior to the thread being rolled, using purpose-built thread rollers.

“The 304 and 316 grades of raw material are freely available, and widely used in bolt manufacturing, owing to its excellent resistance to corrosion.”

He says the uniqueness of SA Bolt Manufacturers’ stainless steel bolts can be attributed to the company’s using austenitic alloys – a type of steel alloy comprising iron, carbon, chromium, nickel and other minor alloys.

Austenitic steels can be divided into the 300 series and 200 series, with steels in the former group containing about 8% nickel, and those in the latter group replacing portions of that nickel with cheaper alloys such as nitrogen or manganese.

“Stainless steel bolts are highly resistant to corrosion, as they are composed of austenitic alloys that provide a thin and self-repairing layer around the metal surface.”

These bolts are mainly used where corrosion is a significant factor, such as at coastal installations, or applications entailing highly corrosive materials such as mineral separation in mining.

Although stainless steel fasteners are expensive, possibly two to three times costlier than standard carbon steels, they perform better, last longer and preserve the integrity of the installation in the appropriate application, adds Cohen.

When compared to imported raw material, particularly at current exchange rates, as well as sea freight, supply chain and logistics constraints, many end-users prefer to source locally rather than risking lead time delays, Cohen concludes.

Edited by Zandile Mavuso
Creamer Media Senior Deputy Editor: Features



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