Taps and dies are generally metalworking tools for the creation (cutting) of screw threads in metal parts. For tapping a hole, a drill and tap size chart is usually required. This article or section is in need of attention from an expert on the subject. ... Screw thread, used to convert torque into the linear force in the flood gate. ... Hot metal work from a blacksmith In chemistry, a metal (Greek: Metallon) is an element that readily forms positive ions (cations) and has metallic bonds. ... Below is a comprehensive drill and tap size chart for all drills, imperial and metric, and taps up to 1 inch. ...

History

While modern taps and dies are routinely made of metal, this was not the case in earlier ages, when woodworking tools were employed to fashion very large wooden bolts and nuts for use in winches, windmills, watermills, and flour mills of the Middle Ages; the ease of cutting and replacing wooden parts was balanced by the need to resist large amounts of torque, and bear up against ever heavier loads of weight. As the loads grew ever heavier, bigger and stronger bolts were needed to resist breakage. Some nuts and bolts were measured by the foot or yard. This evolutionary development eventually led to a complete replacement of wood parts with metal parts of an identical measure. When a wooden part broke, it usually snapped, ripped, or tore. The splinters having been sanded off, the remaining parts were encased in a makeshift mold of clay, and molten metal poured into the mold, so that an identical replacement could be made on the spot. Hot metal work from a blacksmith In chemistry, a metal (Greek: Metallon) is an element that readily forms positive ions (cations) and has metallic bonds. ... Artists can use woodworking to create delicate sculptures. ... Modern self-tailing winch on a sailing boat. ... Spanish Windmills at La Mancha A windmill is an engine powered by the wind to produce energy, often contained in a large building as in traditional post mills, smock mills and tower mills. ... Watermill of Braine-le-Château, Belgium (12th century) A watermill is a structure that uses a water wheel or turbine to drive a mechanical process such as flour or lumber production, or metal shaping (rolling, grinding or wire drawing). ... The flour mill or grist mill is a kind of mill which is fed grain and makes flour. ... The Middle Ages formed the middle period in a traditional schematic division of European history into three ages: the classical civilization of Antiquity, the Middle Ages, and modern times, beginning with the Renaissance. ... Torque applied via an adjustable end wrench Relationship between force, torque, and momentum vectors in a rotating system In physics, torque can informally be thought of as rotational force or angular force which causes a change in rotational motion. ... The Gay Head cliffs in Marthas Vineyard are made almost entirely of clay. ...

Tap

Three tap sizes and types

The tap cuts a thread on the inside surface of a hole, creating a female surface which functions like a nut. The three taps in the image are of different sizes and types. Image File history File links Download high resolution version (1452x1032, 252 KB)Photograph taken by Glenn McKechnie on the 24th March 2005. ... Image File history File links Download high resolution version (1452x1032, 252 KB)Photograph taken by Glenn McKechnie on the 24th March 2005. ... A nut is a type of hardware fastener with a threaded hole. ...

• The top tap has full size thread to the end and is called a bottoming tap; it taps to the bottom of the hole.
• The middle tap is an intermediate tap where the thread tapers before the bottom.
• The lower tap is a taper tap where the thread significantly tapers towards the end. This taper allows the tap to ease into the freshly drilled hole in a gradual cutting action, relieving the cutting pressure on the first few teeth of the tap.

Before using the tap, a hole is created (usually drilled) of minor diameter according to the tap size. This is the equivalent of the blank size (major diameter), less thread depth. The order of usage when hand tapping is to use the taper tap first, the intermediate next (if the material is hard and it is felt that the tap is still working too hard), and finally the bottoming tap is used to create thread for the full depth of the shank or hole.

Practical use and safety of the tap is in tap wrench. Two Bar tap wrenches and a T style tap wrench A tap wrench is a hand tool used to operate any small tool that has a square driving head as part of its body. ...

Die

Five die sizes and types

The die cuts a thread on a preformed cylindrical rod, which creates a male threaded piece which functions like a bolt. The dies shown are Image File history File links Download high resolution version (1488x1122, 322 KB)Photograph taken by Glenn McKechnie on the 24th March 2005. ... Image File history File links Download high resolution version (1488x1122, 322 KB)Photograph taken by Glenn McKechnie on the 24th March 2005. ... Screws come in a variety of shapes and sizes for different purposes. ...

• top left: an older split die, with top adjusting screw
• bottom left: a one piece die with top adjusting screw
• center: a one piece die with side adjusting screw (barely visible on the full image)
• right: two dies without adjusting screws

To use, a cylindrical blank, which is usually slightly less than the required diameter, is machined with a taper (chamfer) at the threaded end. This chamfer allows the die to ease onto the blank before it cuts a sufficient thread to pull itself along. In the design of machine tools there is a need for users to be able to quickly and easily install or remove particular cutting bits or other accessories from the powered rotating spindle of the machine tool. ...

The adjusting screws allow the die to be compressed or expanded to accommodate slight variations in size, due to material, manufacture, or die sharpness. The two rightmost dies shown in the image have no adjusting screws, however the die holder can be used to exert pressure and close the cutting size down if required.

Each tool is used independently, but are usually sold in paired sets of both types, one die and three taps. Some sets however may provide a lesser number of taps. The common sets shown are designed for hand operation, but different types such as helical or spiral may be used in production tools such as CNC machining tools. A CNC Turning Center A CNC Milling Machine The abbreviation CNC stands for Computer Numerical Control, and refers specifically to a computer controller that reads G-code instructions and drives the machine tool, a powered mechanical device typically used to fabricate metal components by the selective removal of metal. ...

Tap Drill Bit Size Table (source: http://www.boltdepot.com) and other Technical Data (source: http://www.tapdie.com)

Main article: Drill and tap size chart

Below is a comprehensive drill and tap size chart for all drills, imperial and metric, and taps up to 1 inch. ...

Pipe

Threaded pipe is often used in plumbing and pneumatic applications. Because pipe joints must form a seal, the threaded portion is slightly conical rather than cylindrical. As a result, threaded pipe requires specialized taps and dies. A threaded pipe plug; note that the threaded portion is slightly conical and so touches the calipers at only two points. ...

BSP (British Standard Pipe) parallel threads are available in sizes 1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 1 inch (further details shown on website source: http://www.tapdie.com). They are also available in Tapered thread-form and called BSPT (British Standard Pipe Tapered) for British pipe sizes or NPT (National Pipe Tapered) for American tapered pipe taps and dies and again further details aren shown on website source (http://www.tapdie.com).

Rolled threads

Not all threads are made by cutting. In large production runs or where great strength is required, the threads may be rolled, both for the male and female portions.

In the case of the tap there are no cutting edges but instead the tap is lobed. The tap is forced into the hole and the material is deformed by the lobes into the required thread form. The male portion (bolt) is fed between rollers that have the full thread form ground into their outer diameter. The action of feeding the rollers into the work piece deforms the material into the required shape.

Rolled threads have the advantage of increased strength (the material flows into shape, similar to forging) along with reduced material cost as the bar or rod used is actually smaller than the finished size due to the material squeezing into shape. This article is about smithing. ...

Other uses

An ordinary tap and die can also be used for repairing threads in stripped holes or bolts. Die nuts are dies made for cleaning up old threads, they have no split for resizing and are made from a hexagonal bar so that a wrench or shifter spanner can be used to apply them (rather than the purpose built die wrench). Dienuts are only for cleaning threads (not for cutting threads). Taps, dies and dienuts can all be viewed with sizes and types from the website source (http://www.tapdie.com) Combination wrench, or combination spanner A wrench or spanner is a tool used to provide a mechanical advantage in applying torque to turn bolts, nuts or other hard-to-turn items. ...

Metalworking:
Drilling and threading: Image File history File links Blacksmith-hammer-anvil-50x50. ... This article or section is in need of attention from an expert on the subject. ...	Die head | Drill | Drill bit | Drill bit shank | Drill bit sizes | Drill and tap size chart | Drilling | Jig borer | Pin chuck | Screw thread | Taps and dies | Tap wrench A die head is a threading die that is used in the high volume production of threaded components. ... A drill in use. ... Drill bits are cutting tools used to create cylindrical holes. ... The shank is the part of a drill bit grasped by the chuck of a drill. ... Drill bits are the cutting tools of drilling machines. ... Below is a comprehensive drill and tap size chart for all drills, imperial and metric, and taps up to 1 inch. ... An electric drill A drill is a tool with a rotary drill bit used to bore holes through material. ... The jig borer is a type of machine tool invented at the end of World War I to make possible the quick-yet-very-precise location of hole centers. ... Two pin chucks. ... Screw thread, used to convert torque into the linear force in the flood gate. ... Two Bar tap wrenches and a T style tap wrench A tap wrench is a hand tool used to operate any small tool that has a square driving head as part of its body. ...
Metalworking topics:   Casting | CNC | Cutting tools | Drilling and threading | Fabrication | Finishing | Grinding | Jewellery | Lathe (tool) | Machining | Machine tooling | Measuring | Metalworking | Hand tools | Metallurgy | Milling | Occupations | Press tools | Smithing | Terminology | Welding This article or section is in need of attention from an expert on the subject. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... A CNC Turning Center A CNC Milling Machine The abbreviation CNC stands for Computer Numerical Control, and refers specifically to a computer controller that reads G-code instructions and drives the machine tool, a powered mechanical device typically used to fabricate metal components by the selective removal of metal. ... a Cutting Tool, in the context of Metalworking is any tool that is used to remove metal from the workpiece by means of shear deformation. ... Drilling is the process of using a drill bit in a drill to produce holes. ... A typical steel fabrication shop Fabrication is an industrial term generally applied to the building of metal machines and structures. ... Metalworking finishing is the activity of making things out of metal in a skillful manner. ... Rotating abrasive wheel on a bench grinder. ... Jewellery (jewelry in American English) is any piece of fine material used to adorn the human body. ... Conventional metalworking lathe In woodturning, metalworking, metal spinning, and glassworking, a lathe is a machine tool which spins a block of material so that when abrasive, cutting, or deformation tools are applied to the block, it can be shaped to produce an object which has rotational symmetry about an axis... A lathe is a common tool used in machining. ... A machine tool is a powered mechanical device, typically used to fabricate metal components of machines by the selective removal of metal. ... The examples and perspective in this article or section may not represent a worldwide view. ... This article or section is in need of attention from an expert on the subject. ... Metalworking hand tools are hand tools that are used in the metalworking field. ... Metallurgy is a domain of materials science and of materials engineering that studies the physical and chemical behavior of metallic elements, their intermetallic compounds, and their mixtures, which are called alloys. ... Cutters for a milling machine. ... It has been suggested that this article or section be merged with Smith (metalwork). ... Power press with a fixed barrier guard A press, or a machine press is a tool used to work metal (typically steel) by changing its shape and internal structure. ... A smith, or metalsmith, is a person involved in the shaping of metal objects. ... This article needs to be wikified. ... Welding is a fabrication process that joins materials, usually metals or thermoplastics, by causing coalescence. ...