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This fasteners basics sheet from bolt depot in the USA covers the basic definitions of standard fastener types. ..

Torx screws have a shape in the head that resembles a six sided star. These allow for a greater torque strength. There is also a security version for secure environments that incorporates a pin in the centre of the star so common drivers will not fit..

Bolts are typically marked on the head to show what grade bolt they are. For a list of the most common grade markings see our Material Grade Identification and Properties Chart. Note that, in addition to the grade marking, many bolts also have a manu..

These charts show the dimensions of a number of the nuts that we currently sell. These dimensions have a tolerance of +/- 1mm. . ..

Except for the very lowest grades metric nuts and bolts all carry identification markings which indicate their strength.  On the head of each bolt there are  two numbers which are separated by a decimal point.  The bolt heads also have a code of norm..

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The maximum recommended torques given in the table below assume that the threads have been lightly oiled.  Doing a bolt up to a specific torque should set the tension in the bolt to appeoximately 85% of the prrof load given in the table.  You should ..