BDE-Fastening & Joining

Several structural design considerations should be taken into account for economical and efficient welding.

These nuts are internally threaded, precision, work-hardened steel with external undercuts on two sides.

Typically, metal special fasteners are more costly than standards because they are made through hot or cold forming.

A variety of methods join without fasteners.

The free-spinning locknut turns freely onto a bolt until seated against a base.

Inserts are classified as two general types: those held in place by external threads and those that use some means other than threads (knurls, grooves, interference fit) for their holding power.

These requirements should be considered in selecting the best insert: shear strength of parent material, operating temperature, load requirement, presence of vibratory loads, ease of installation, and installed cost.

A built-in locking feature develops full locking action as soon as these nuts are engaged with the bolt threads.

Stamped retaining rings have a tapered radial width that decreases symmetrically from the center section to the free ends.

Bottoming or shouldering of studs should be avoided by driving them only to a predetermined depth.

The Injected Metal Assembly (IMA) process is a special method devised by Fishertech, a division of Fisher Guage Limited.

Some joint-design considerations are universal; others vary with the assembly methods used.

This fastener is an externally or internally threaded metal part designed to be fused permanently in place by standard production-welding equipment.

Studs require a two-part assembly operation but offer several advantages.

Fasteners that remain attached to the panel or parent material, even when disengaged from the mating part, are captive screws.