Generally speaking, metal fasteners are divided into 2 types: permanent fasteners, and non-permanent fasteners. Screws, nuts and bolts, rivets, retaining rings and clamps are examples from the first category. Non-permanent fasteners include quick-release couplers and clamps intended for removal at a specified time and pins, which allow relative movement of fastened parts.
Here are some advantages of both permanent and non-permanent metal fasteners:
Permanent fasteners:
Reduce damage to painted surfaces
Work better with surfaces that need to fit more closely
Eliminate corrosion usually associated with mechanical fasteners
Reduce panel "dimpling"
Fewer stress points from holes drilled to accommodate bolts and screws
Non-Permanent fasteners:
Connected materials can be shifted or changed
Worn or broken fasteners can be more easily replaced
Connections can be broken when needed
Also, metal fasteners can be separated into light duty fasteners and heavy duty fasteners: light duty metal fasteners are great for bags, straps, military/tactical items, pet collars and leashes, medical products, marine and diving items, tent and awning applications, equine items, and firefighter products. Most items are nickel plated and come in various sizes depending on the webbing being used. Black and military plating are also available. Various items are mil-spec. Heavy duty metal fasteners like ratchets, cam buckles, and hooks are designed for aircraft and vehicle cargo applications like tiedowns and restraints.
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