Screw Thread Terminology

 Screw Thread Terminology

Thread Nomenclature |Types | Terms | ENGINEERING STUDY MATERIALS.

Major diameter – In an external thread like the edges of a screw, major diameter refers to the diameter of the overall shaft, including the height of the raised helix. It can be measured on the crests with a calliper rule or slot gauge.

Minor diameter – Minor diameter measures the diameter of the “root,” or innermost part of the screw, not including the crests of the helix. For accuracy, this measurement requires specialized equipment.

Effective diameter – The effective diameter is halfway between the major and minor diameters. In other words, it measures halfway up the helix crest. For accuracy, this measurement also requires specialized equipment.

Pitch – The pitch is the distance between two identical threads.

Flank – The flank is the angle at which the helix is raised to form a crest on the thread.

Crest – The crest is the height at which an external thread is raised, or the depth at which an internal thread is indented. For common applications, screws and bolts are measured at the crests, while nuts are measured at the roots.

Tags:

Thread Nomenclature,screw thread nomenclature,thread terms,thread angles,thread nomenclature in hindi,thread nomenclature nptel,screw thread,thread angle,nomenclature of thread,nomenclature of thread profile,nomenclature of screw thread,nomenclature of screw thread in hindi,thread nomenclature learn and grow, learn and grow, thread nomenclature engineering study materials

 Screw Thread Terminology

Thread Nomenclature |Types | Terms | ENGINEERING STUDY MATERIALS.

Major diameter – In an external thread like the edges of a screw, major diameter refers to the diameter of the overall shaft, including the height of the raised helix. It can be measured on the crests with a calliper rule or slot gauge.

Minor diameter – Minor diameter measures the diameter of the “root,” or innermost part of the screw, not including the crests of the helix. For accuracy, this measurement requires specialized equipment.

Effective diameter – The effective diameter is halfway between the major and minor diameters. In other words, it measures halfway up the helix crest. For accuracy, this measurement also requires specialized equipment.

Pitch – The pitch is the distance between two identical threads.

Flank – The flank is the angle at which the helix is raised to form a crest on the thread.

Crest – The crest is the height at which an external thread is raised, or the depth at which an internal thread is indented. For common applications, screws and bolts are measured at the crests, while nuts are measured at the roots.

Tags:

Thread Nomenclature,screw thread nomenclature,thread terms,thread angles,thread nomenclature in hindi,thread nomenclature nptel,screw thread,thread angle,nomenclature of thread,nomenclature of thread profile,nomenclature of screw thread,nomenclature of screw thread in hindi,thread nomenclature learn and grow, learn and grow, thread nomenclature engineering study materials