Threads, Bolts, Nuts, Washers

Thread Basics

  • Figure 2-0 Fundamental features of a thread from Machine Shop Methods by Lorus J. Milne, p. 98
  • Figure 2-0 Features of a unified thread form from Machine Shop Methods by Lorus J. Milne, p. 103
  • Inventor 2014 saves the Thread.xls spreadsheet in C:\Users\Public\Documents\Autodesk\Inventor 2014\Design Data\XLSen-US folder
  • Autodesk Inventor - coolOrange threadModeler Thread Modeler Tool (need to login with Autodesk ID or email, e.g. NormalOne)
    • Inventor Tools tab > Thread Modeler button, then click a thread to populate the dialog box
    • C:\Users\jensejj\AppData\Roaming\Autodesk\Application\Plugins\Autodesk_ThreadModeler.bundleContents\Thread Templates\SW Template.ipt or ISO Template.ipt
      • Figure 2-0 CoolOrange Thread Modeler in the Tools Ribbon
    • Thread Sketch Template:
    • This plugin was written by Philipe Leefsma, Developer Consultant at Autodesk, working as part of the Autodesk Developer Network program.
    • Support information - email with feedback or requests for enhancements
    • The ThreadModeler tool has been developed to allow Inventor users to generate a realistic modeled equivalent thread based on an existing Inventor thread feature. Users are able to select an existing thread feature in the model, which the ThreadModeler then converts to a realistic 3D modeled thread based on the underlying thread feature properties. Modeled threads are accurately generated saving a lot of time and effort for the user when compared with a manual approach, bringing a higher degree of realism to your models. This plug-in was first published as an ADN Plugin of the Month: The plug-in has been provided with the complete source code needed to build the application, with the intention of encouraging users of Autodesk software to use programming to tailor the products they use to their specific business needs.
    • Figure 2-0 How to Cut Screw Threads in the Lathe, Bulletin No. 36A by South Bend Lathe, p. 13

Standards and Industry


  • Creating a 1/2“ Nut (head diameter 3/4”) - Hansen Method
  1. Create a 2D Sketch within Inventor, select the XY origin work plane
  2. Create a 6 sided polygon (hexagon), centered at the origin
  3. assign a dimension of 3/4“ across the flats (size of wrench used to install the nut)
    1. Figure 1-0 2D Sketch of 3/4" Nut
  4. draw a 1/2” circle (size of nut, that is where the nut threads will be applied), assign a 1/2“ dimension and then finish the sketch.
  5. extrude the nut 0.375 inches in the negative z-direction
    1. Figure 2-0 3D Sketch of 3/4" Nut
  6. apply a thread (cannot be done in sketch mode). Use an interior thread (class 2B) with size 1/2” and 32 threads per inch
    1. Figure 3-0 Threads on a 3/4" Nut
  • Creating a 3/4“ Hex Nut - ASME/ANSI Method
  1. follow steps in Hansen Method then do the following
  2. On the YZ plane, create the following triangle (interior angle of 30°, adjacent distance of (Gmin - Fmin)/2, and distance from centerline axis of Gmax/2
  3. Revolve around the z-axis, using Full circle cut
    1. <b>F</b> is the width across the flats, also known as the size of wrench to use.
    2. <b>G</b> is the width across the corners
    3. Nut size (interior hole diameter) is the size bolt that the nut is used with, not the size of wrench used to adjust nut. Same applies to washers and bolts, purchase based on the diameter of the bolt, not the head size (see - Measuring Fastener Diameter).
    4. Figure 4-0 Common Diameter for Bolts, Washers and Nuts
    5. Table showing the Bolt diameter (how it is purchased) and the wrench/head used to install it US Bolt Head/Wrench Size
    6. Figure 4-0 Chamfer on a 3/4" Nut
  • Create a 3/8” Hex Nut - ASME/ANSI Method
  • Figure 4-0 3/8" Hex Nut with corner Chamfers on both sides

Civil Engineering Engineering - Computer Engineering - Electrical Mechanical Engineering

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