Nut and Bolt Tutorial
Thread Representations
Parts to a Thread
Thread Dimensioning
Major Diameter Thread Series (IE UNC,
UNF, ACME, etc)
A = External
½ - 13 UNC – 2 A or B B = Internal
Threads per Inch Class of Fit (1,2, or 3)
Bolt- Simplified Threads
Overview
1. Create a cylinder that is the same diameter as the major diameter
2. Create bolt head. (Will use reference materials from the textbook to create). Bolt head is
designed based upon the major diameter
3. Create cosmetic threads
Steps
1. Create a cylinder with a diameter of .50(this is the major diameter) and length of 1.75. Circler
view should be on the top datum
2. Bolt Head: Sizes can be found in the Drafting and Design Text book page 840
a. Select Extrude > Right mouse button define internal sketch > select one of the flat ends
of the cylinder > select sketch
b. Select reference tool > select the edge of the cylinder (this will create a reference point
for the center of the bolt head
c. Select the circle tool > draw a circle from the center of the cylinder > set the diameter to
.866 > right mouse button on the circle > select construction (this changes the circle to
construction circle, which we will use as a reference to scribe a hexagon).
d. Select the line tool > draw the following hexagon
e. Select the equal lengths tool from the constraints menu > select each line (note you Equal Length
should only have to do this 3 times to full constrain the hexagon.
L1 Should be next to 3 of the 6 edges. NOTE You may get an over constrained error
Delete The angle or the linear dimension from the constraint list
f. Green check the sketch
g. Set the height of the hexagon to .302
h. Bolt Head Chamfer
i. Select the revolve tool > right mouse button define internal sketch > select the
front datum (we need to select this one because the plane goes through the
points and not the flats of the hexagon).
ii. Draw the following triangle; be sure to set a centerline
Centerline
iii. Green check
iv. Select the subtract icon in the revolve info tab
v. Green Check
3. Cosmetic Thread
a. Model Tab > Select the down arrow next to Engineering > select cosmetic thread
b. Info Bar looks as follows
Thread Size and Thread per inch:
Major Diameter and Threads per inch
Thread Start
Thread Length
Surface
Thread Selection
c. Select Thread Icon
d. Selection is the thread surface > select the cylinder
e. Select the Thread Start Surface box > select the end of the thread that does not have the
bolt head
f. Thread Size and Thread per Inch = ½-13
g. Enter thread distance = 1.25
h. Green Check
Note: You will not be able to see the threads unless you change the view to Hidden Lines
4. Thread end Chamfer
a. Model Tab > Select Chamfer Tool
b. Select the end of the cylinder
c. Set the D = .05 in the chamfer info bar.
d. Green Check
Finished Part
Note Purple Lines represent the Minor Diameter of the thread
Nut-Simplified Threads
1. Drawing the overall shape of the nut
a. Model Tab > Select Extrude > right mouse button > select top datum
b. Draw a circle at the origin that is a diameter of .866 > right click on the circle and change
it to construction
c. Draw a hexagon > set each line as equal length (Note this is the same hexagon size as
above)
d. Green Check
e. Set the Extrude distance = .4375
f. Green Check
2. Nut Chamfers
a. Model Tab > select Revolve> right mouse button > select define internal sketch > select
the front datum (this should be the datum that passes through the corners of the
hexagon and not the flats).
b. Draw the following triangles and set the centerline in the middle of the nut
c. Green Check
d. Select the subtract icon in the Revolve Tab
e. Green Check
3. Setting the Threaded Hole
a. Select the Hole Tool
b. Select the top surface of the nut
c. Place the locators on the Front and Right Datum
d. Set the values to 0.00 for both locators
e. Select the Thread Icon in the Hole Info Bar > Change the settings to the following
Through All
Set Major Diameter and
Thread per inch to ½-13
f. Click on the Shape Tab > Select Thru Thread
g. Green Check
Finished Part
