Ontork Head Studs bring performance and reliability to the Cummins 24v. Ontork studs are made of a proprietary SA4000 material rated to 268,000ksi. Ontork's stud design eliminates the need for washers due to the large surface area the nuts. If you want the best studs on the market you found them. Ontork studs are manufactured in the USA and are made for diesels only.
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