Maintenance

Oil filters exposed

There are fundamental differences between different levels of oil filters that most folks, including many technicians, don't know.  Here are some basics to pass along to your customers.
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Threaded fastener grades (Part 3

Performance aftermarket fastener manufacturers offer much higher tensile strength fasteners that are specifically designed for racing applications. ARP, for example, offers threaded fasteners that boast 170,000 psi, 190,000 psi and 220,000 psi.
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Threaded fastener grades (Part 2)

The grade system for nuts is a number that represents 1/10 of the specified proof load stress (in kgf/mm2). The proof load stress corresponds to the minimum tensile strength of the highest grade bolt that can be used with that nut.
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Threaded fastener grades (Part 1)

The grade label specifies the minimum strength properties the fastener is intended to meet. Industrial fasteners are also marked with a label that identifies the maker of the fastener. Grade markings on domestic fasteners meet ASTM and SAE specs, while metric fasteners meet ISO and SAE specs.
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