Fasteners Flashcards
Define the effective diameter of a bolt
-> imaginary line through the middle of the tooth
Define pitch of a thread
-> distance from any point of a thread to the corresponding point on the next
Define major diameter
- > distance from root to root on nut
- > distance from crest to crest on bolt
Define Crest
-> top surface of thread
Define Root
-> Bottom of the groove
define the flank or side
-> surface that connects root to crest
Define thread angle
-> angle between the flanks
Define Angular Depth
-> the triangle formed by the intersection of the extended flanks
Define Actual Depth
-> distance between the crest and root measured
Define the fundamental Triangle
-> imaginary triangle created from the crest to root to crest
Define Lead
-> the distance the screw thread advances axially in one complete turn
Define Class 5 fit
-> Tight Fit
Define Class 4 fit
-> Close fit
Define class 3 fit
-> Medium fit
Define class 2 fit
-> Free fit
Define class 1 fit
-> Loose fit
Define Square thread
- > square teeth
- > where all dimensions are pitch/2
Define Acme Thread
- > modified square thread
- > wedge shaped
- > thread angle of 29 degrees
Define Buttress thread
- > one face at 90 to axis
- > other at 45
- > used in quick release bench vices
Define Ball screw thread
- > half circle cut outs
- > used in flap drives
What is the angle of BA thread
47.5 degrees
What is the BSW and BSF thread
55 degrees
what is the angle of UNC, UNF and metric threads
60 degrees
what is the difference between a bolt and a screw
bolt = has head then shank or grip then thread screw = has head then all thread
