Robert Taylor Product Line Manager ARaymond
A S S E M B LY: F A S T E N E R S
How do I know which threaded fastener is right for my application? There’s no mathematical equation that will give you the answer to if and when a threaded fastener should be used in an application, but there are guidelines to follow for an educated decision. Threaded fasteners can be used in any application where a threaded joint is deemed necessary for the proper assembly or continued safe use of a product. When selecting the ideal threaded fastener for an application, one must consider the: • Loading expectations • Vibration • Risk of failure • Serviceability • Assembly environment • Number of required fastener assemblies
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U-nuts are self-retaining fasteners that provide an easy and fast attachment of mating panels. They will not turn as the screw is driven into place or freeze on screw threads.
The fasteners and load expectations are typically determined by a manufacturer’s R&D department and based on the end product. In some cases, the expected loading is small or the risk of failure so little that threaded fasteners are unnecessary. A non-threaded joint would then be sufficient. However, when the loading of an application is great and the risk of failure is high, standard nuts and bolts are required. But what about for the millions of applications used in high-speed assembly environments or that are in the mid-loading range? For example, these are applications that require bolt sizes between #6 screws, 3.5mm in nominal diameter, to M12s or 1/2-inch screws. In
December 2021 www.fastenerengineering.com
these instances, self-retaining threaded fasteners are the ideal choice over conventional nuts and bolts. The benefits of self-retaining threaded fasteners • Available in options to meet loading expectations • Reduce assembly time • Reduce floor space in an assembly plant • Can be installed as part of an assembly • Serviceable To choose the proper self-retaining threaded fasteners for an application, consider the following. The assembly environment In assembly-line or sub-assembly DESIGN WORLD
