Today’s Plan

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:

ScrewsSet ScrewsSelf Tapping Screws Bolts

Screws

Screws pass through one part and thread into another

Screws

Screws

Screws

Set Screws

A type of screw generally used to secure an object within another

object

The screw passes through a threaded hole in the outer object and is tightened against the inner

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

Unified National Course Unified National Fine

UNC UNF

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