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Sep 21, 2016 Understanding Bolting Preload

A frequently misunderstood aspect of using bolts to clamp things together is “preload,” which is the tension applied to the bolt itself by tightening the nut (as opposed to the actual load on the bolted joint). A sufficient preload will help avoid bolt fatigue as joint loads vary. Fluctuating joint loads will affect the clamping force on the bolting components (bolt and nut) rather than…

Jul 21, 2016 Cadmium vs. Zinc Corrosion Barriers for Carbon Alloy Fasteners

Cadmium and zinc are the two most popular electro-deposited coatings. To a lesser degree, aluminum, copper, tin, nickel, chromium, lead and silver are also used. Zinc, cadmium and aluminum are preferred due to their relationship with carbon steel, stainless steel, and most other nonferrous metals used in fastener applications in the Galvanic Series. The plating material is less noble than the fastener.

May 23, 2016 Fastener CLASS


The term “class” in fastener industry usage can have different meanings depending on the characteristic it’s meant to describe, and the context of its usage. For example:

Class of Fit – All bolting components are manufactured to a specific class of fit.  When making a purchase, buyers should…