A hex bolt used in carpentry is identified by its hexagonal head and (shown here) fully threaded.

Hex Bolt

A hex bolt used in carpentry is identified by its hexagonal head and (shown here) fully threaded.

A representation of the square threaded nut and screw. The left image shows the threaded screw with a continuous helix drawn. The nut is cut in half to show how the threads are drawn with respect to the screw.

Diagram of Square Thread Nut and Screw

A representation of the square threaded nut and screw. The left image shows the threaded screw with…

A representation of the square threaded nut and screw. The left image shows the threaded screw with a continuous helix drawn. The nut is cut in half to show how the threads are drawn with respect to the screw.

Diagram of Square Thread Nut and Screw

A representation of the square threaded nut and screw. The left image shows the threaded screw with…

Double threaded screw.

Double Threaded Screw

Double threaded screw.

The point noue lace border is a 15th century design. It is a pattern that is produced by plaiting and knotting the threads.

Point Noue Lace Border

The point noue lace border is a 15th century design. It is a pattern that is produced by plaiting and…

An illustration of the V thread screw. The screw is drawn by connecting the two opposite points of the thread to create the required pitch.

Conventional V Thread Screw

An illustration of the V thread screw. The screw is drawn by connecting the two opposite points of the…

A double thread screw drawn by drawing diagonal lines in between the pitch. The double thread screw is a screw with threads bunched together between the pitch.

Double Thread Screw

A double thread screw drawn by drawing diagonal lines in between the pitch. The double thread screw…

Illustration of a common representation for square thread screw. The screw is drawn in two dimensions and used in drafting plans and mechanical drawing.

Square Thread Screw Mechanical Drawing Representation

Illustration of a common representation for square thread screw. The screw is drawn in two dimensions…

A close up of a square thread on a screw. This representation shows the correct an accurate three dimensional view of the screw.

Square Thread Screw

A close up of a square thread on a screw. This representation shows the correct an accurate three dimensional…

Single threaded screw.

Single Threaded Screw

Single threaded screw.

This tassel was designed by German artist Holbein. It consists of a tuft of threads or cords hanging straight down from a core of wood, with decorated twisted threads.

Tassel

This tassel was designed by German artist Holbein. It consists of a tuft of threads or cords hanging…

This tassel was designed by German artist Holbein. It consists of a tuft of threads or cords hanging straight down from a core of wood, with decorated twisted threads.

Tassel

This tassel was designed by German artist Holbein. It consists of a tuft of threads or cords hanging…

The modern tassel consists of a tuft of threads or cords hanging straight down from a core of wood, with decorated twisted threads.

Modern Tassel

The modern tassel consists of a tuft of threads or cords hanging straight down from a core of wood,…

The modern tassel consists of a tuft of threads or cords hanging straight down from a core of wood, with decorated twisted threads.

Modern Tassel

The modern tassel consists of a tuft of threads or cords hanging straight down from a core of wood,…

The modern tassel consists of a tuft of threads or cords hanging straight down from a core of wood, with decorated twisted threads.

Modern Tassel

The modern tassel consists of a tuft of threads or cords hanging straight down from a core of wood,…

The modern tassel consists of a tuft of threads or cords hanging straight down from a core of wood, with decorated twisted threads.

Modern Tassel

The modern tassel consists of a tuft of threads or cords hanging straight down from a core of wood,…

The old standard tassel consists of a tuft of threads or cords hanging straight down from a core of wood, with decorated twisted threads.

Old Standard Tassel

The old standard tassel consists of a tuft of threads or cords hanging straight down from a core of…

This Turkish harness tassel is a 17th century design. It consists of a tuft of threads or cords hanging straight down from a core of wood, with decorated twisted threads.

Turkish Harness Tassel

This Turkish harness tassel is a 17th century design. It consists of a tuft of threads or cords hanging…

The illustration detailing of a screw thread. Threads are created by drawing a cylindrical shape at a constant diameter. The pitch, length between the threads, is drawn along the cylinder at an angle.

Drawing Screw Thread

The illustration detailing of a screw thread. Threads are created by drawing a cylindrical shape at…

Triple threaded screw.

Triple Threaded Screw

Triple threaded screw.

Lefthand single thread worm and worm wheel.

Worm And Worm Wheel

Lefthand single thread worm and worm wheel.

Righthand single thread worm and worm wheel.

Worm And Worm Wheel

Righthand single thread worm and worm wheel.