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Lesson No. 13 Week No. 07 Name of lesson Screw Threads

Lesson No. 13 Week No. 07 Name of lesson Screw Threads. THREADS. ELEMENTS OF SCREW THREADS. 1. Major dia.:- The largest dia. of a screw thread. 2. Minor Dia.:- The smallest dia. Of a screw thread. 3. Pitch Dia.:- It is an imaginary dia. In between the major and minor dia.

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Lesson No. 13 Week No. 07 Name of lesson Screw Threads

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  1. Lesson No.13Week No.07Name of lessonScrew Threads

  2. THREADS ELEMENTS OF SCREW THREADS

  3. 1. Major dia.:- The largest dia. of a screw thread. 2. Minor Dia.:- The smallest dia. Of a screw thread. 3. Pitch Dia.:- It is an imaginary dia. In between the major and minor dia. 4. Axis of Screw:- It is the longitudinal central line through the screw.

  4. 5. Angle of Thread:- It is the angle included between the side of the thread. 6. Helix Angle:- It is the angle made by the helix. 7. Crest:- It is the top surface joining the two side of a thread. 8. Flank (Side):- It is the slant surface of the thread which connects the crest with the root.

  5. 9. Root:- It is the bottom surface joining the two sides of a thread. 10. Depth of Thread:- The distance between the crest and the root of a thread measured normal to the axis. 11. Thickness of the Thread:- The distance between the adjacent side of the thread measured along or parallel to the pitch line.

  6. FORMS OF SCREW THREADS

  7. British Standard Whitworth Thread (B.S.W) British Standard Fine Thread (B.S.F) British Standard Pipe Thread (B.S.P) British Association Thread (B.A) Seller’s Thread Square Thread Buttress Thread Acme Thread Knuckle Thread

  8. QUESTION • List the parts of screw threads. • What are the types of Screw threads ? • What is the use of Screw threads ?

  9. CONCLUSION Thus, we get the knowledge of Screw Threards

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