Question

chapter 3
fasteners, sealants, and gaskets
name maximo punoo
date \t\t\tperiod 5
instructor olson
after studying this chapter, you will be able to:

• identify fasteners used on small gas engines and implements.
• remove and install various fasteners correctly.
• repair or produce internal and external threads.
• properly select and install fasteners.
• remove, select, and install gaskets correctly.

instructions: after studying chapter 3 of the text, complete the following questions and problems.

1. list at least four of the various conditions to which fasteners are exposed during service.

1. a thread is a(n) __ __ that circles around a shaft, or in a hole.
2. flat head screws or bolts must have their heads set into a(n) ____ hole so they will be flush with the surface.
3. the most common angle for the heads of flat head screws is ____.

Explanation:

###[Client Connection Error] Question 1

Fasteners in service are exposed to conditions like vibration (causing loosening), temperature changes (thermal expansion/contraction), moisture (leading to rust/corrosion), and mechanical stress (from loads/forces). These are common environmental and operational factors affecting fasteners.

A thread is a helical ridge (or "inclined plane" in form) that circles a shaft or hole, used for fastening/joining. The term for this is "helical ridge" (or "screw thread" structure, but the blank likely expects "helical ridge" or similar; key is the helical, circular form around shaft/hole).

Flat - head screws/bolts need a countersunk hole so their heads sit flush with the surface. A countersunk hole has a conical recess to accommodate the flat - head's angle, ensuring flushness.

Answer:

Four conditions: Vibration, Temperature changes, Moisture (corrosion), Mechanical stress.

Question 2