What are Fasteners | Materials | Fastener Terminology– Fastener is a hardware device that mechanically joins or affixes two or more objects together. In general, fasteners are used to create non-permanent joints; that is, joints that can be removed or dismantled without damaging the joining components. Common examples of fasteners are nut and bolts, screws, rivets and many more.
- There are three major steel fasteners used in industries: stainless steel, carbon steel, and alloy steel. The major grade used in stainless steel fasteners: 200 series, 300 series, and 400 series. Titanium, aluminum, and various alloys are also common materials of construction for metal fasteners.
- In many cases, special coatings or plating may be applied to metal fasteners to improve their performance characteristics by, for example, enhancing corrosion resistance. Common coatings/platings include zinc, chrome, and hot dip galvanizing.
What are Fasteners | Materials | Fastener Terminology
Head: It is an enlarged section at one end of a fastener that provides a bearing surface.
Body: The unthreaded portion of a bolt between the head and the threads; some fasteners are fully threaded and therefore have no body.
Shank: The portion of a headed fastener between the head and the opposite end.
Pitch: The distance from one point on a screw thread to a corresponding point on an adjacent thread; pitch is measured parallel to its axis in the same axial plane and on the same side of the axis.
Screw thread: A uniform ridge on the external or internal surface of a cylinder, forming a helix around or inside the cylinder’s circumference.
External thread: Thread on the outside of a fastener.
Internal thread: Thread on the inside of a fastener.
Right hand thread: Thread is “right hand” when, viewed axially, it winds in a clockwise and receding direction around the fastener.
Left hand thread: Thread is “left hand” when, viewed axially, it winds in a counterclockwise and receding direction around the fastener.
Threads per inch (TPI): It is the decimal count of the number of threads on a one-inch section of fastener. Threads per inch are most commonly used for inch-measure fasteners.
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