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engineer-mechanical:inventor-threads [2019/08/17 22:00]
jjensen [Screw Thread Designation]
engineer-mechanical:inventor-threads [2019/10/17 14:26] (current)
jjensen [Screw Thread Designation]
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 ==== Threads, Bolts, Nuts, Washers ==== ==== Threads, Bolts, Nuts, Washers ====
 +
 +===== Thread Introduction =====
 +  * Thread Terminology - either external threads (male) or internal threads (female)
 +  * Thread Forms - each thread form is designed to meet a specific requirement
 +  * Unified Threads - abbreviated as UN and further broken down in coarse (UNC), fine (UNF), and extra fine (UNEF)
 +  * Metric Threads - abbreviated as M, based on the nominal outside (major) diameter of an external thread and the pitch.
 +  * Acme Threads - use to transmit power as in jacks for lifting loads
 +  * Buttress Threads - use to transmit power as in jacks for lifting loads
 +  * Taper Pipe Threads - V-shaped thread with a taper and designed to produce a seal between the threads of the mating parts
 +  * Methods of Displaying Threads - simplified, schematic and detailed
 +  * Designations - general tolerances on prints do not apply to thread features. Must lookup the ASME standard to determine the thread tolerances
 +  * Unified Threads - example 1/4-20 UNC-2A
 +    * 1/4 = 0.25" nominal bolt diameter
 +    * 20 = Threads Per Inch (TPI)
 +    * UNC = Unified Coarse
 +    * 2 = class of fit
 +    * A = external threads
  
 ==== Screw Thread Designation ==== ==== Screw Thread Designation ====
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