An illustration of the hexagonal bolt head showing measurements. The measurement of diameter, D, is used to calculate the dimensions. The diameter of the head and the nut, H, is 1 ½D ₌ ⅛, and the distance of T is half the diameter.

U.S. Standard Hexagonal Bolt Head

An illustration of the hexagonal bolt head showing measurements. The measurement of diameter, D, is…

This carriage bolt has a rounded head and a slotted drive.

Carriage Bolt

This carriage bolt has a rounded head and a slotted drive.

Carriage bolt is a fastener with a round head with a square head, and tightened by using a nut and wrench. The bolt is commonly used in furniture making.

Carriage Bolt

Carriage bolt is a fastener with a round head with a square head, and tightened by using a nut and wrench.…

A carriage bolt with a truss head and a wing nut.

Truss Carriage Bolt and Wing Nut

A carriage bolt with a truss head and a wing nut.

Expansion bolt is used to fasten lightweight objects. The bolt has an expansion jacket, where the mechanism expands when tighten.

Expansion Bolt

Expansion bolt is used to fasten lightweight objects. The bolt has an expansion jacket, where the mechanism…

Eye bolt has a looped end with threads at the opposite end. The bolt is primarily used in attaching cables to objects.

Eye Bolt

Eye bolt has a looped end with threads at the opposite end. The bolt is primarily used in attaching…

Hanger bolt is a fastener used in wood working with two different sized threads and some have no center threads.

Hanger Bolt

Hanger bolt is a fastener used in wood working with two different sized threads and some have no center…

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.

"Upon a tripod provided with levelling screws stands the pillar P, to which is fixed the graduated azimuthal circle CC. The compass box B, with the vernier V, attached to it, moves on the azimuthal circle by means of a pivot at the pillar P. Two uprights, U, U, are fixed to the side of the compass-box, on the tops of which rests the axis of the telescope T. A graduated are A, is fixed to the bottom of one of the uprights, and the angle of elevation of the telescope is marked by the vernier on the arm E, attached to the axis of the telescope. A level, L, is also hung on the axis of the telescope, for adjusting the instrument. Inside the compass-box is another graduated circle, F, the line joining the zero-points of which is parallel to the axis of the telescope. All the fittings are in brass or copper, iron, of course, being unsuitable." — Chambers' Encyclopedia, 1875

Declinometer

"Upon a tripod provided with levelling screws stands the pillar P, to which is fixed the graduated azimuthal…

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…

A screw head with detailed measurements for accurate drawing. These measurements are based off the diameter of the overall screw and the head.

Diagram of Screw Head

A screw head with detailed measurements for accurate drawing. These measurements are based off the diameter…

A convenient screw cutting using a lathe to create threads on the metal rod.

Screw Cutting Device using Lathe

A convenient screw cutting using a lathe to create threads on the metal rod.

Machine screw

Machine Screw

Machine screw

Machine screw

Machine Screw

Machine screw

Machine screw

Machine Screw

Machine screw

Machine screw

Machine Screw

Machine screw

Machine screw diagram

Machine Screw

Machine screw diagram

Machine screw diagram

Machine Screw

Machine screw diagram

Machine screw diagram

Machine Screw

Machine screw diagram

Machine screw diagram

Machine Screw

Machine screw diagram

A kind of metal pin to fasten boards and timbers together, and for other purposes.

Nail

A kind of metal pin to fasten boards and timbers together, and for other purposes.

Wing nut is a fastener with a threaded hole used to keep objects in place. Wing nut can be loosen or tighten by hand.

Wing Nut

Wing nut is a fastener with a threaded hole used to keep objects in place. Wing nut can be loosen or…

"A vertical rod, generally of iron, with a heavy metallic foot, and a number of metallic rings, of different sizes ... the whole serves to support a retort or other vessel, properly adjusted as to height, over a lamp-flame." -Whitney, 1911

Retort Stand

"A vertical rod, generally of iron, with a heavy metallic foot, and a number of metallic rings,…

Righthand spiral gears

Righthand Spiral Gears

Righthand spiral gears

Screw with lead and pitch.

Screw

Screw with lead and pitch.

"The cutting-tool in a screw-cutting machine; a screw-plate." -Whitney, 1911

Screw Cutting Die

"The cutting-tool in a screw-cutting machine; a screw-plate." -Whitney, 1911

A section of a screw-cutting die.

Screw Die Section

A section of a screw-cutting die.

"Screw-punch. a, bed; b, yoke, on the inner sides of which are slides for the cross-head c; d, the punch proper; e, nut for the screw; f, weighted lever by which the screw is made to exert its power upon the punch d." -Whitney, 1911

Screw Punch

"Screw-punch. a, bed; b, yoke, on the inner sides of which are slides for the cross-head c; d, the punch…

"A handle for holding the threaded die by which the thread is cut on a bar, a nut, or a pipe; a die-stock; a screw-plate." -Whitney, 1911

Screw Stock

"A handle for holding the threaded die by which the thread is cut on a bar, a nut, or a pipe; a die-stock;…

Allen headless set screw is a hex socket screw used to fasten two objects.

Allen Headless Set Screw

Allen headless set screw is a hex socket screw used to fasten two objects.

A collar screw is used as mechanical stops, locating components, and bearing faces. The screw is commonly found in machines, usually in power transmission, motors, and gearboxes.

Collar Screw

A collar screw is used as mechanical stops, locating components, and bearing faces. The screw is commonly…

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…

The shaping machine used to cut triple threads on a screw viewed from a lengthwise axial section.

Cutting Triple Worms Screw

The shaping machine used to cut triple threads on a screw viewed from a lengthwise axial section.

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…

Drive screw is a threaded fastener used in industrial application. The screw is designed to last long by having a strong and durable head.

Drive Screw

Drive screw is a threaded fastener used in industrial application. The screw is designed to last long…

The lag screw is used in fastening heavy timbers with a square or hexagonal head.

Lag Screw

The lag screw is used in fastening heavy timbers with a square or hexagonal head.

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…

The screw cutting device is used to create thread on a lead rod.

Universal Screw Cutting Device

The screw cutting device is used to create thread on a lead rod.

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed for attaching two pieces of wood.

Wood Screw

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed…

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed for attaching two pieces of wood.

Wood Screw

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed…

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed for attaching two pieces of wood.

Wood Screw

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed…

"Jewelers' box of dies, stocks, and taps (called a screw-plate set." -Whitney, 1911

Screw-Plate Set

"Jewelers' box of dies, stocks, and taps (called a screw-plate set." -Whitney, 1911

The Hunter's screw is formed of two screws, a larger and a smaller. The former being screwed internally to allow the latter to screw into it.

Hunter's Screw-press

The Hunter's screw is formed of two screws, a larger and a smaller. The former being screwed internally…

The screw, or spiral-bladed wheel, used in the propulsion of steam-vessels.

Screw-propeller

The screw, or spiral-bladed wheel, used in the propulsion of steam-vessels.

A shoulder screw, also known as stripper bolt, is a fastener where the thread ends at the larger diameter. The screw usually used in machinery.

Shoulder Screw

A shoulder screw, also known as stripper bolt, is a fastener where the thread ends at the larger diameter.…

Single threaded screw.

Single Threaded Screw

Single threaded screw.

A square threaded tap or screw with three equal lengthed thickness. The stepped tap is used to fasten two materials together with unthreaded top.

Stepped Threaded Tap

A square threaded tap or screw with three equal lengthed thickness. The stepped tap is used to fasten…

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…

Turnbuckle is a screw device to adjust the tension or length of ropes, cables, tie rods, and other tension system.

Turnbuckles

Turnbuckle is a screw device to adjust the tension or length of ropes, cables, tie rods, and other tension…

A screw made of iron, and furnished with a sharp thread, for insertion in wood.

Wood Screw

A screw made of iron, and furnished with a sharp thread, for insertion in wood.

The wood screw used to fasten two pieces of wood together. Wood screws usually have unthreaded shank below the head.

Wood Screw

The wood screw used to fasten two pieces of wood together. Wood screws usually have unthreaded shank…