Fasteners Metal: an overview

Fixing metrics are fasteners that are manufactured and labeled according to a worldwide standard of measurement. This rule worldwide is set by the International Organization for Standardization (ISO), headquartered in Geneva, Switzerland. This global standard is based on the metric system.

There are many ways in which fasteners can be measured and built to the dimensions. It 'important that there is a kind of standard for the screws, with the countless number of products and equipment that are based on screws to be together quickly. The United Kingdom, United States and Canada invented as faster measurement system in 1949 called the Unified Thread Standard. They hoped he would become the world standard. But the ISO standards eventually won out. The UK no longer uses this standard to all, and Canada is currently halfway through the transition to ISO standard metric mounting. Today, 40% of screws and products made in the U.S. are made with metric faster systems. Little by little, are replacing UTS fasteners metric mounting. Soon, UTS will be extinct.

Fixing metrics are measured in millimeters of their diameter wire from edge to edge, and not from part of the screw shank. The capital letter "M" precede the number of millimeters of width of the wire is. For example, a fastening element can be metric 5 mm in width, and will be referred to as M5. A wire 6 mm in width is referred to as M6.

Fixing metrics used to come with two thicknesses of wire: fine and coarse. Neither was better or worse than others, but are not compatible. Thus the ISO decided on fine-threaded screws as standard. Today, most new products are made with thin threads in mind, but you can still get coarse threads, since some older products that use coarse threads still need to be repaired from time to time....