The document discusses threads and fasteners, which are topics covered in an Engineering Drawing and Graphics course. It defines threads as helical structures that convert rotational to linear movement, and describes common fasteners like bolts, nuts, screws and keys. The document provides details on thread features, types of threads and how to draw threads and threaded fasteners using straight lines. It also outlines the course syllabus which includes orthographic projections, sections, surface developments, isometric drawings and detail drawings of machine parts.

1. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
ENGINEERING DRAWING
&
GRAPHICS

2. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
THREADS
&
FASTENE
RS

3. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
THREAD:
it is a helical
structure used
to convert
between
rotational and
linear
movement or
force.

4. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
Fasteners include:
• bolts and nuts (threaded)
• set screws (threaded)
• washers
• keys
• pins
Fasteners are not a permanent means of assembly
such as welding or adhesives.

5. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
Types of Threads:
1- External Threads and
2- Internal Threads

6. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
Types of Threads:
3- Clockwise (RH) Threads and
4- Counter Clockwise (LH) Threads
TURNBUCKLE

7. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
Crest: The top surface.
Root: The bottom Surface.
Side: The surface between the crest and root.
Angle of Thread: The angle between the threads.
Screw Axis: The longitudinal centerline.
8
Axis Pitch
Angle
Crest
Root
Side
Minorn
Thread Depth
MajornPn

8. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
Major: The Crest diameter
Minor: The root diameter
Pitch(P): The distance from a point on a screw thread to a
corresponding point on the next thread (in/Threads).
Thread Depth: Distance between Major and Minor
Axis Pitch
Angle
Crest
Root
Side
Minor
Thread Depth
MajorP

9. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER

10. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
How to DRAW:
During drawing
threads of Nuts,
Bolts, Screws, etc.
the straight lines will
be used.

11. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
DRAW A BOLT HEAD:

12. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
DRAW A HEXAGONE NUT & BOLT :
FOR EASINESS 0.875=~7/8”. and 0.67 =~ 11/16” Pitch=2/8”, Depth=2/8”

13. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
DRAW A SQUARE NUT & BOLT :
FOR EASINESS 0.875=~7/8”. and 0.67 =~ 11/16” Pitch=2/8”, Depth=2/8”

14. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
NUT & BOLT(D=1.5”, L=6”, Lthread=3”)

15. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
Screw Thread Forms

16. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
Screw Thread Forms

17. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
Screw Thread Forms

18. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
Screw Types

19. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
DRAW SCREW

20. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
DRAW SCREW

21. MEHRAN UNIVERSITY
OF ENGINEERING & TECHNOLOGY, JAMSHORO
B.E MECHANICAL ENGINEERING
BATCH-F16, 1ST
YEAR,1ST
SEMESTER
SYLLABUS
• Introduction & Basics: Introduction to graphic language, Essential drawing
instruments and their correct use. Line types and lettering. Basic drafting techniques
and standards. Curves used in engineering.
• Orthographic Projections:
• Orthographic multi view projection of some simple and composite solids.
• Sections: Sectioning and projection of auxiliary views.
• Surface Development: Surface development of simple solids such as cylinder, cone,
prism and pyramid, surface development of intersecting solids.
• Isometric Projections: Isometric projection / drawings of piping.
• Freehand/Sketching : Sketching and basic rules of sketching.
• Detail, assembly and Working Drawings: Preparing detail, assembly and working
drawings of various machine and engine parts such as, keys, cotters, foundation bolts,
screws, pulleys, couplings, bearings riveted joints and nut and bolts. Fundamentals of
geometric dimensioning and tolerance.
• Computer Aided Drawing: Computer aided drafting (CAD). Auto CAD Software