BAER Encyclopaedia
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A tap is a chip-removing precision tool for producing internal threads in pre-drilled holes. During thread cutting, the tap removes material from the hole wall to form the characteristic helix of the thread. It is one of the fundamental tools in metalworking and is used in virtually all areas of mechanical and plant engineering.
A tapered mandrel is a pointed or conical mandrel used to facilitate centring, to start before drilling, or to align workpieces correctly.
Tensile strength indicates the maximum stress a material can withstand before fracturing. It is expressed in N/mm² (Newtons per square millimetre).
The higher the value, the "stronger" or "harder" the material.
A thread cutter is a tool or collective term for tools used to produce threads. This includes both taps for creating internal threads and dies for producing external threads. Thread cutters generally work by chip removal, cutting material along the thread line to form the desired thread profile.
Thread flanks are the inclined sides of a thread turn – i.e. the surfaces between the thread crest and thread root.
A thread former (also: thread forming tool) forms a thread by plastic deformation rather than cutting.
Thread gauges are tools or gauges for measuring/checking threads – e.g. go thread plug gauges, internal gauges, ring gauge sets etc.
A thread insert is a separate part (e.g. wire thread insert or self-tapping insert) that is placed into a prepared internal thread to repair or reinforce it.
Thread pitch is the distance between two consecutive thread crests. It also indicates how far a screw advances axially in one complete revolution.
The thread profile describes the characteristic shape of a thread in longitudinal cross-section. Key parameters such as flank angle, thread crests and roots, and the basic shape of the thread are visible. From this representation, angles and diameters can easily be read, and the thread form is recognisable at a glance.
A thread relief is a short recess or groove before the thread start in a hole or pre-drilled hole, allowing the tap to engage freely.
A thread ring gauge is a ring-shaped gauge, primarily for external threads, used to check whether these conform to the required dimension and profile.
Thread runout refers to the zone at the end of a thread where the thread gradually terminates and is no longer fully profile-forming.
Thread standard refers to the binding standards by which threads are defined in terms of profile geometry, pitch and dimensions – e.g. DIN, ISO, ANSI, Whitworth.
A thread template is a measuring or inspection device used as a reference to check whether the thread profile is correct.
A through hole is a completely drilled hole in a workpiece that passes from one side to the other.
Think of it like a tunnel: there is an entry and an exit, so a thread or bolt can be passed through.
A trapezoidal thread is a special thread profile form in which the flanks of the thread turns do not taper to a point but are trapezoidal. The flank angle for metric trapezoidal threads to DIN 103 is generally 30°. Inch trapezoidal threads such as the Acme thread with a flank angle of 29° also exist.
TriTap is a product line of universal machine taps from BAER Tools GmbH, made from HSSE-VAP – a high-alloy high-speed steel with 5% cobalt and vapourised surface. The tools feature a special shank geometry combining the traditional square drive with a three-flat shank that provides a secure grip in hand-held drills.
TurboCentrix is a series of twist drills from BAER Tools GmbH. They are made from HSSE/Co5 (high-alloy high-speed steel with 5% cobalt) and are therefore particularly resistant to heat and wear.
A turning tool is a tool for cutting threads on lathes (e.g. on the lathe bed) or CNC turning centres.
A twist drill is a drill with a helical flute (spiral) that removes material during drilling.