Fasteners AssignmentPart C: 3/8-16 UNC-2A 1.5 FLAT HEAD
Check PDF packet page one for quick reference
to page numbers…
Start by drawing the following vertical
rectangle .375x1.5
• Offset top line down ½ D (0.1875)• Draw a line from the blue circle intersection
heading “@1<50”• Mirror angled line over to the left side of
the fastener and fillet, trim, extend, / erase.
Add slot for screw driver. Dimensions for height and width are 1/4D as
noted in the book example.
• Check last page of PDF for dimensions of steel plates.
• Top plate has a clearance hole for the fastener.
• Bottom plate is tapped (threaded)- See page 1 of PDF for page number referencing
threaded holes• Bottom plate has more threads cut than
length of bolt, i.e. bolt can’t bottom out without fully tightening down.
• Pilot hole (pre-drilled hole before tapping can occur) extends lower than threads and has 80 degree angle (same as the twist drill bit that cut the hole). Dimensions can be
“eye balled.”
