The document is a presentation by Adnan Aslam on thread terminology, describing the essential components of screws and nuts, such as major diameter, minor diameter, and pitch. It explains various terms related to threads, including the definitions of lead, crest, and flank. The content serves as an overview of thread basics relevant to machine design.

2. WELLCOME

3. PRESENTATION BY :
ADNAN ASLAM ADNAN
ROLL NO: 9801
CLASS: T.M.R - B
Thread Terminology

4. ☺WHAT IS THREAD ? ? ?
 The continuous helical groove on a screw or
on the inner surface of a nut.

5. Uses of threads:
AS TEMPORARY
FASENTER
FOR POWER
TRANSMISSIOM

6.  THREAD TERMS:
☺MAJOR DIAMETER
☺PITCH DIAMETER
☺MINOR DIAMETER
☺ANGLE OF THREAD
☺DEPTH OF THREAD
☺ROOT ☺ LEAD
☺CREST ☺ FLANK
☺PITCH

8.  It is the largest diameter of an internal or
external screw thread. It is also known as
outside or nominal diameter.

9.  It is the smallest diameter of an internal or
external screw thread. It is also known as core or
root diameter.

10.  Angle of adjacent flanks measured at the
cross-section of the screw thread- included
the axis of the screw thread.

11.  The height between the root and the crest
vertically to the thread axis.

12.  The bottom surface joining the two adjacent
flanks.

13.  The top surface joining the two flanks of a
thread is called crest.

14.  It is the distance from a point on one thread
to the corresponding point on the next point.
This distance to be measured parallel to the
axis of the thread.

15.  Thread face(excluding the root and crest).

16. 9. LEAD
 The distance covered by the nut in a
single revolution on bolt parallel to the
axis is called “LEAD”

17. COMPOSER:
SUBJECT:
CREDITS:
• ADNAN ASLAM
ROLL NO:(9801)
• MACHINE
DESIGN
• MT - 343
• T.M.R ; B
• SESSION:(2009-
12)

18. LINE FOR SESSIONALS