1. MACHINE DRAWING NAME : SYED AMER UR RAHMAN B.TECH 2 – 2
TOPIC: SCREW FASTENERS

2. NOMENCLATURE OF THREADS
Angle
Flank
Lead
out side diameter
Root / Core dia
Nominal diameter
Root
Pitch
Crest
NOMENCLATURE OF THREADS

3. EXTERNAL THREAD
INTERNAL THREAD

4. TYPES OF THREADS T P
90 d
T= d = 0.5P
SQUARE THREAD

5. TYPES OF THREADS
55° P
d/6 D d
D=0.96P
d=0.64P
WHITWORTH THREAD

6. TYPES OF THREADS p T d
29°
T=0.3707p
d= 0.5p mm
ACME THREAD

7. TYPES OF THREADS
d/8 P D F d
45°
D = P
d = 0.75P
BUTTRESS THREAD

8. TYPES OF THREADS P R D
R=0.25P
D=0.5P
KNUCKLE THREAD

9. HEXAGONAL NUT AND WASHER40 w 52 48 24 20
100 24 3
HEXAGONAL HEADED BOLT
WITH
HEXAGONAL NUT AND WASHER

10. RIVETED JOINTS Types of riveted joints
Rivets are used to fasten permanently two or more plates
or pieces of metal .Joints made with rivets are called
riveted joints.
They are commonly used in ship building and for the
Construction of steel buildings ,bridges ,boilers ,tanks, etc.
Plates joined together by means of a riveted joint cannot be
disconnected without Chipping –off rivet heads from one side
of the joint
Types of riveted joints
Lap joint:- In a lap joint the plates to be connected over lap each other
Butt joint:- In a butt joint edges of the plates to be connected butt against each other and the joint between them is covered by butt –plates

11. Double riveted lap joint Double riveted (zig zag) lap jointPr L
Double riveted (zig zag)
lap joint A Pd P
1.5d Pr t

12. Single riveted butt jointP A A
Single riveted butt joint

13. FOUNDATION BOLTS
These bolts are used for fixing machines to their foundations.
Simple forms of these bolts can quickly forged from mild steel or wrought iron bar .These bolts are suspended in hole and cement grout is then poured to fill up the space around them

14. EYE FOUNDATION BOLT D

15. RAG FOUNDATION BOLT 48 72
120

16. LEWIS FOUNDATION BOLT
ø24 24 16 36
105

17. 0.8D
1.5D 2D 2D
0.4D
1.5D
LIFTING EYE-BOLT

18. 2D D D 2D
EYE BOLT

19. TYPES OF NUTS D
0.25D
2.2D
Flanged nut

20. D
0.5D
0.25D
1.5D+3
Cap nut

21. 0.5D D D
Dome nut

22. 1.8D D
0.2D
Capstan nut

23. 0.5D
1.8D
1.5D D
Ring nut
Wing nut

24. PREVENTION OF ROTATION OF BOLTS
T-headed bolt
0.8D D
1.8D
Hook bolt
0.8D D
Counter sunk headed bolt
0.8D D
Cup headed bolt D
0.8D

25. Square headed bolt
Cup headed bolt
Cheese headed bolt

26. LOCKING ARRANGEMENT FOR
NUTS
SPLIT-PIN

27. D
0.6D
LOCK NUT OR CHECK NUT

28. NUT BOLT WITH SPRING WASHER

29. CASTLE NUT WITH A SPLIT PIN

30. SLOTTED NUT WITH A SPLIT PIN

31. COTTER JOINT

32. KNUCKLE JOINT

33. FLANGE COUPLING

34. PROTECTIVE FLANGE COUPLING

35. FOOT STEP BEARING
BUSHED BEARING

36. PLUMMER BLOCK

37. PREVENTING ROTATION OF BRASSES
By making a step rectangular on the one outside and fitting inside a corresponding hole

38. PREVENTING ROTATION OF BRASSES
SNUGS
By snugs at the side

39. PREVENTING ROTATION OF BRASSES
SNUGS
By snugs at the top fitting inside the cap. the oil hole is drilled inside a corresponding hole.

40. PREVENTING ROTATION OF BRASSES
by making the step octagonal on the outside and fitting inside a corresponding hole.