Bolts and Screws

Cards (14)

Detachable Fastenings 
Constructed so that machine parts can be readily connected or disconnected without damage to the machine or the fastenings
Types of Detachable Fastenings
Bolt
Screw
Bolt 
A threaded fastener designed to pass through holes in the mating members and to be secured by tightening a nut from the end opposite the head of the bolt
Types of Bolts 
Carriage bolt
Elevator bolt
Countersunk bolt
Track bolt
Stud bolt
Stove bolt
U-bolt
Eye-bolt
Machine bolt
Screw 
A threaded fastener designed to be inserted through a hole in a one member to be joined and into a threaded hole in the mating member
Types of Screws 
Cap screw
Set screw
Sheet-metal screw
Lag screw
Types of Cap Screws
Hexagonal
Filister
Flat filister
Button
Flat
Hexagonal socket
Fluted
Round
Types of Set Screw Points
Flat point
Half-dog point
Cup point
Cone point
Types of Threads 
UNC (Unified National Coarse)
UNF (Unified National Fine)
UNEF (Unified National Extra Fine)
Pitch (P) 
Axial distance between adjacent threads
Lead (L) 
Axial distance a thread advances in one revolution
Major Diameter (Do) 
Outside diameter of the threads and is the nominal diameter
Minor Diameter or Root Diameter (Di) 
Smallest diameter of the thread
Pitch Diameter (Dm) 
Mean diameter of the major and minor diameter