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Allmetal Screw Products
Category: General technical and industrial > Glossary of fastener terms
Date & country: 14/08/2008, US
Words: 158


Acorn Die
A form of threading die for use in screw machines. The cutting portion resembles an acorn.

Acorn Nut
A blind tapped hex nut with an acorn shaped top. Provides sealing for projecting threaded parts.

AMS
Aeronautical Material Specifications are material and process specifications for aircraft components conforming to established engineering and metallurgical practices in the aircraft industries. They are developed by the SAE aeronautics committee. All specifications are prefixed by 'AMS'.

AN
Dimensional standards for aircraft fasteners developed by the Aeronautical Standards Group. All drawings are prefixed by 'AN'

ASTM
Standards developed by the American Society for Testing and Materials.

Balls
Used in 'quick release pins' where permanent assemble and disassemble action tales place. Provides a reliable holding fastener.

Barrel Nut
An internally threaded screw having a slotted head.

Bent Bolt
A cylindrical rod having a thread at one end and the other end bent to some desired conformation; also a bent cylindrical rod having threads at both ends.

Bevel
A surface not at right angles to the rest of the piece.

Binding Head
Rounded top surface and slightly tapered sides. The bearing surface is flat with annular undercut optional.

Blind Rivet
A rivet designed for use where only one side of the work is accessible.

Blunt Start
The removal of the partial thread at the entering end of thread.

Body of Bolt or Screw
Also designated grip. The blank portion of the bolt or screw which is between the thread and the head.

Bolt Blank
A headed rod or bar intended for a subsequent threading operation.

Brinell Hardness Test
A method of determining the hardness of metallic materials by applying a known load to the surface of the material through a hardened steel ball of known diameter. The diameter (or depth) of the resulting impression in the metal is measured. The Brinell hardness number is taken as a quotient of the applied load divided by the area of the surface im...

Burnish
To smooth or polish by a rolling or sliding tool under pressure.

Cap Nut
A blind tapped hex nut with an acorn-shaped top. Provides sealing for projecting thread parts.

Captive Screws
Where the shank above the threaded portion is undercut lower than the threaded portion.

Carbide
A compound of carbon with one or more matallic elements.

Carbon Steel
Any steel made by combining carbon with iron.

Carriage Bolts
A round or flat head bolt with a square neck to prevent rotation. Used in wood assemblies.

Casting
1. A term applied to the act of pouring molten metal into a mold. 2. The metal object produced by such pouring.

Centerless Grinding
Grinding the outside or inside diameter of a round piece not mounted on centers.

Chamfer
(v) To bevel a sharp external edge. (n) A beveled edge.

Chasing Threads
Cutting screw threads by moving a tool along the axis of the work to be threaded.

Chatter
Rough or unsatisfactory surfaces on work. It is usually caused by a slight jumping of the tool away from the work or of the work away from the tool.

Check Nut
A double chamfered hexagon machine screw nut Class 3B fit. (AN 316).

Chip
The metal removed by a tool.

Chuck
Device for holding work in machine tools.

Clevis
U-shaped shackle for connecting a rod to a pin.

Clevis Pins
A headed dowel pin with a drilled shank that accepts a cotter pin. Used as a fastener where more than temporary holding actions is required. (ASA B 5.20-1958).

Companion Flanges
Shaft attached collars of 18-8 stainless steel into which a threaded piece may be joinedd. Has standard I.P.S. threads.

Comparator
A device for inspecting screw threads and outlines by comparing them with a greatly enlarged standard chart.

Crest
That surface of the thread which joins the flanks of the thread and is farthest from the cylinder or cone from which the thread projects.

Deburring
The removal of burrs by a secondary operation such as grinding.

Deep Drawing
Forming shapedd articles or shells by forcing sheet metal into a die.

Die Casting
A very accurate and smooth casting made by pouring a molten alloy usually under pressure into a metal mold or die.

Double End Stud
Threaded at both ends with standard Class 2A threads to take nut assembly.

Dowel Pins
Used as a holding pin with chamfered on one end. Drilled headed dowel pin (clevis pin) used - frequently removed fastener.

Endurance Limit
The maximum stress that a metal will withstand without failure during a specified large number of cycles of stress.

Face
To machine a flat surface perpendicular to the axis at rotation on a lathe.

Fatigue Strength
The stress to which a metal can be subjected for a specified number of cyclic changes of stress.

Fillet
A rounded filling of the internal angle between two surfaces.

Fin
A thin projecting rib.

Finished Hexagon Bolts
A washer faced or chamfered bearing surface with a close body tolerance.

Fit
The general term used to signify the range of tightness which may result from the application of a specific combination of allowances and tolerances in the design of mating parts. See 'Class of Thread'

Flat Head
Flat top surface and a conical bearing surface.

Following Flank
The flank of a thread opposite to the leading flank.

Forge
To shape metal while holt and plastic by a hammering or forcing process. Dies used in process.

Form of Thread
The profile of a thread in an axial plane for a length of one pitch.

Full Annealing
Annealing a ferrous alloy by austenitizing and then cooling slowly through the transformation range.

Full-Size Body
The body of a bolt or screw which has a diameter between the minimum and maximum limits of the major diameter of the thread.

Galvanize
To treat with a bath of lead and zinc to prevent rusting

Grind
To finish or polish a surface by means of an abrasive.

Grip
The unthreaded portion of a bolt or screw.

Hanger Bolt
One endd is gimlet pointed and has a wood screw thread. The other end consists of a coarse machine screw thread. The center section is unthreaded.

Head Marking
Used to identify the material used in a fastener such as a bolt or cap screw. The marking is either raised or indented to specifications.

Heat Treating
An operation involving the heating and cooling of a metal to obtain certain desirable conditions or properties.

Heli-Coil
Coil of wire used as an insert to accept a screw or bolt and adding holding power by forcing itself between the fastener and the walls of the recess when the fastener is driven in.

Hexagon Head
Flat top surface with hexagonal sides andn with a flat bearing surface. (Six Sides)

Hexagonal
A recessed hexagon socket in the headd of a cap or set screw to add greater tightening and loosening power. Used with a Hex key wrench. (See Hexagon Head)

Immunize
To remove small particles of iron or grit from the surface of stainless steel by pickling in an acid solution.

Included Angle of Thread
The angle between the flanks or the thread measured in an axial plane.

Interference Fit
A thread fit having limits of size so prescribed that an interference always results when mating parts are assembled.

Internal Thread
A thread on the internal surface of a hollow cylinder or cone.

Jackson Head
A machine screw with a small oval head. (Trimmed oval head).

Jam Nut
(1.) A second nut forced or jammed against the main nut to prevent loosening. (2.) A thin nut.

Key
A small block or wedge inserted between shaft and hub to prevent circumferential movement.

Keyslot
The recess cut for Woodruff keys produced by sinking a milling cutter of the right diameter and width into a shaft.

Keyway
A groove or slot cut to fit a key. A key fits into a key seat and slides into a keyway.

Knurl
A roughened surface produced by contact with a wheel which forces metal above the surface while making indentations below the surface.

Lead Error
A variation in the distance between the threads of a screw.

Lentil Head Screw
Obsolete term for oval head screw.

Machineability
Relative ease or difficulty in forming.

Magnaflux
A magnetic method of determining surface and subsurface defects in metals.

Master Gage
A thread-plug gage which represents the physical dimensions of the nominal or basic size of the part. It clearly establishes the minimum size of the threaded hole and the maximum size of the screw at the point at which interference between mating parts begin.

Maximum Material Limit
The maximum limit of size of an external dimension or the minimum limit of size of an internal dimension.

Micro-Inch
One millionth of an inch. Used in measuring imperfections of surface finishes.

Milling Process
A machining process whereby a surface is generated with a rotating toothed cutter. Each tooth takes an individual chip.

Monel
A corrosion resisting metal consisting essentially of two-thirds nickel and one-third copper.

MS Specifications
(Military Standard)

Nail Point
A sharp pyramidal point of approximately 30 degrees or 45 degrees included angle.

NAS Drawings and Specifications
Dimensional and material standards for aircraft fasteners developed by the National Aerospace Standards Committee. All drawings and specifications are prefixed by 'NAS'.

Neck
A portion reduced in diamter between the ends of a shaft.

Nifriding
A surface hardening process used on ferrous metals by heating the metal in contact with ammonia gas or other nitrogenous material.

Nipple
A short piece of threaded pipe used to connect two fittings.

Non-Magnetic
Steels with sufficient quantities of manganese or nickel to render the steel non-magentic. 18-8 (300 series chrome-nickel steel) is non-magnetic when annealed. Type 316 is non-magnetic in all conditions. (See pg. 156 of the Data Book).

Normalize
To remove internal stresses by heatinig a metal piece to its critical temperature and allowing it to cool very slowly.

Open Washer
A washer with one side open so as to be removed or put under a nut without removing the nut.

Oval Binding Head Screw
Obsolete term for a truss head screw.

Oval Head
Rounded top surface and a conical bearing surface with an included angle usually of 82 degrees.

Oven Head Screw
Obsolete term for truss head screw.

Peening
The stretching of metal by hammering or rolling the surface.

Pipe Caps
A cap that threads onto a pipe (like a nut) to seal one end.

Pipe Fittings
The term applying to all forms of connecting parts which join pieces sof pipe together.

Pitch Line
A generator of the cylinder or cone of a screw thread specified in the definition of pitch diameter.

Plate
The electro-chemical coating of a metal piece with a very different metal.

Polish
To make smooth or lustrous by friction with a very fine abrasive.

Precipitation Hardening
Hardening caused by the precipitation of a constituent from a supersaturated solid solution.

Punch
(v) To perforate by pressing a non-rotating tool through the work.