Fixings and Fasteners Topics

Acme Thread
A screw thread having a 29 degree included angle. Used largely for feed and adjusting screws on machine tools.
Across Corners
The distance on a nut from one corner to the opposite corner.
Across Flats
The distance on a nut from one flat surface to the opposite flat surface.
AF
Abbreviation of Across Flats.
Allen Type Bolt
A bolt with a recessed hex shaped head.
American Standard Pipe Thread
A type of screw or thread, commonly used on pipe fittings to assure a tight seal.
Anchor Bolt
A special type of bolt used to attach objects or structures to concrete.
BA Threads
Clearance and tapping drill sizes for BA threads.
Bihexagon Nut
A bolt or screw whose cross section of its head is in the shape of a 12 pointed star.
Bolt
A cylindrical threaded fastener.
British Association Threads
A British system of threads with 47.5 included angle with rounded roots and crest. Even numbers are the preferred sizes.
Buttressed Thread
A screw thread with one vertical and one inclined flank.
Cap Nut
A nut that is closed at the threaded end often with a dome.
Caphead Bolt
Fastened with a hexagonal Allen key.
Captive Nut
A nut which fits into a cage and is welded in place.
Carriage Bolt
A small rounded head with a square section under the head designed to stop the bolt rotating.
Castigated Nut
A nut with grooves cut entirely across the top face.
Chasing Threads
The process of cutting threads in a lathe or screw machine.
Cleveloc Nut
A locking nut where the collar of the nut is elliptical in cross section and it is this that provides the flexible locking element.
Coach Bolt
A small rounded head with a square section under the head designed to stop the bolt rotating.
External Thread
A screw thread which is formed on an external cylinder,e.g. bolts, screws, studs.
Female Thread
An internal screw thread designed to mate with a component having male threads of the same size and type.
Fixings and Fasteners Books
Lists all Fixings and Fasteners Books in the Encyclopaedia
Fixings and Fasteners Calculations
Lists all Fixings and Fasteners Calculations in the Encyclopaedia
Fixings and Fasteners Conversions
Lists all Fixings and Fasteners Conversions in the Encyclopaedia
Fixings and Fasteners Weblinks
Lists all Fixings and Fasteners Weblinks in the Encyclopaedia
Flange Nut
A nut with a built in washer to spread the load.
Hexagonal Nut
A nut with a plain internal thread.
Internal Thread
A screw thread which is formed in a hole, such as the thread in a nut.
ISO Metric Threads
Table of ISO Metric Thread standards.
Left Hand Thread
A screw thread that is screwed in by rotating counterclockwise.
Lens Thread M39
Also known as the Leica L-Mount. This is 39mm x 26tpi.
Lens Thread M42
This is an metric 42x1.0mm thread used for single reflex cameras before the bayonet couplings became commonplace.
Lens Thread T2
42mm x 0.75mm lens adaptor thread used by Tamron.
Lock Nut
This can be either a second nut that is tightened against the first nut or a nut that has some form of system that prevents the nut from coming loose with vibration, eg Cleveloc or Nyloc.
Metric Threads
Tapping and clearance drill sizes for coarse and fine metric thread sizes.
Model Engineers Thread
A thread based upon the Whitworth thread form that was established in 1912.
Multiple Thread Screw
A screw made of two or more threads to provide an increased lead with a specified pitch.
Nut
A type of hardware fastener with a threaded hole.
Nyloc Nut
A nut with an elastic ring that grips the bolt and stops he tendancy for the nut to vibrate loose.
Right Hand Thread
A screw thread that is screwed in by rotating clockwise. Most threads are right handed.
Rolled Thread
A thread formed by plastically deforming a blank rather than by cutting.
Screw
A helical projection of uniform section on the internal or external surface of cylinder or cone.
Screw Thread
A ridge of constant section which is manufactured so that a helix is developed on the internal or external surface of a cylinder.
Self Tapping Screw
A self-drilling fastener that drills its own hole, taps a mating thread, and then fastens, all in a single operation.
Set Screw
A plain screw used principally for locking adjustable parts in position.
Siemens and Halske Thread
German electrical engineering company that later became part of Siemens AG. Siemens & Halske Thread was used in telephones around 1900 AD.
Socket Bolt
Fastened with a hexagonal Allen key.
Split Pin
A metal pin with two arms which is passed through a hole and held in place by the springing apart of the arms.
Square Nut
A square nut.
Symmetrical Thread
Both flanks of the thread profile are inclined at the same angle.
T Bolt
The head of the bolt is designed to locate in the T slots of a bedplate.
Thread
A helical projection of uniform section on the internal or external surface of cylinder or cone.
Thread Angle
The angle formed by the two sides of the thread with each other.
Thread Axis
A line running lengthwise through the centre of the screw.
Thread Crest
The top surface joining the two sides of a thread.
Thread Depth
The distance between the crest and the root of a thread.
Thread Flank
The thread flanks join the thread roots to the crest.
Thread Height
This is the radial distance between the minor and major diameters of the thread.
Thread Length
The length of the portion of the fastener with threads.
Thread Micrometer
A micrometer in which the spindle is ground to a point having a conical angle of 60 degrees.
Thread Pitch
The distance from a point on one screw thread to a corresponding point on the next thread.
Thread Pitch Diameter
The diameter of a screw thread measured from the thread pitch line on one side to the thread pitch line on the opposite side.
Thread Root
The bottom surface joining the sides of two adjacent threads.
Thread Runout
The portion at the end of a threaded shank which is not cut or rolled to full depth, but which provides a transition between full depth threads and the fastener shank or head.
Threaded Insert
A threaded coil that′s used to restore an original thread size hole that has damaged threads.
Threads per Inch
The number of threads in a linear inch along the length of a threaded component.
Thumbscrew
A screw or bolt whose head is in the shape of a flattened, vertical fin, so that the bolt can be turned by the fingers.
U Bolt
A U-shaped, bent iron bar that has bolts and threads at both ends.
Wing Nut
A nut with wings that allow it to be tightened and released using fingers.
Wood Screws
The diameter and pilot drill size versus wood screw gauge.

Previous PageNext Page

Subjects: Civil Engineering Mechanical Engineering Tools