Threads Flashcards
External thread
Threads appear on the outside
Internal thread
Threads appear on the inside (water bottle body). The crest is the minor diameter
Thread body is also known as:
The shank
Pitch refers to:
The distance between two crests/roots
Axis denotes:
Chamfer
Located at the end of the shaft to ease the thread
Crest
The top of the threading
Root
The bottom of the threads
Depth of thread
The distance between the root and the crest
Included angle
The angle of the root to its sides
Major diameter
Diameter between crest to crest of opposing side
Minor diameter
Distance between root to the root of the opposing side
Threads per inch
The reciprocal of pitch in inches
Pitch diameter
The distance between the midpoint of crest and root on one side to the other
Right hand thread
When a thread engages when rotating clockwise
Left handed thread
When a thread engages when rotating clockwise “Lefty tighty” ex. bicycle pedal, gas fittings, circular saw
Fit of 3
Very tight
Fit of 1
Very loose
Lead
How much 360 degrees goes in
Vanish thread/partial thread/washout thread/thread runout
The unused thread due to the chamfer
