Today’s Plan Fasteners Threading

Fasteners

What is a Fastener? A hardware device that mechanically joins or affixes two or more objects together

Fasteners can be categorized as follows: Screws Set Screws Self Tapping Screws Bolts

Screws pass through one part and thread into another

Screws

Screws

Screws

Set Screws are used to secure things such as pulleys, gears & shafts The screw passes through a threaded hole in the outer object and is tightened against the inner object A type of screw generally used to secure an object within another object Set Screws are used to secure things such as pulleys, gears & shafts

Set Screws

Self Tapping Screws Screws that will cut their own threads in a predrilled hold – If the hole is the appropriate size

Self Tapping Screws

Bolts Threaded fasteners that hold parts together by squeezing them between the head on one end and a nut on the other

Bolts

Assignment

Threading

What is a Thread? The raised helical rib going around a screw

There Are Two Types of Threads UNC UNF Unified National Course Unified National Fine

How do we thread a hole?

First we need to determine what size hole we need to thread

Once we have drilled the appropriate sized hole

We choose the appropriate tap

The Drill & Tap Process