True

False

A thin plate disc with a hole in the middle

something that cleans metal

a way to edit pith and thread settings

A tool

to keep nuts and bolts separate

to eliminate the need for torque settings

generally to distribute the load of a fastener

to make it look better

to add more weight to the product

to make it look stronger

to distribute the tensile load and prevent damage

because it is a good way to add colour

used to prevent loosening caused by vibration

used to eliminate the need for a nut

used to add character to the product

used to make it look high tech

used instead of a nut

used to prevent loosening by torsion/twist forces

used because they are lighter

used to prevent rust

so they do not bite into the surface

so that they do bite into the surface to prevent loosening

so that they are easy to undo by them selves

to add rust protection

flat

open

Belleville

upside-down

open

flat

dome

pin

flat

open

spring

dome

spreading loads over a larger surface area,

reducing the surface areas,

to make the fastening look better,

to reduce the time of fitting the fasteners together,

true

false

Nyloc-Nylon locking nut

flat washer nuts

non-Nyloc nuts

high pitch nut

Button nut

Washer nut

Nylon locking nut-Nyloc

standard nut

standard nut

flat washer nyloc nut

lock washer

shape pitch and colour

hardness size and weight

size colour and weight

Performance durability and cost