Correct option is B
The
box nut in a
bench vice is typically made of
phosphor bronze because it provides
high wear resistance, low friction, and excellent strength. The
box nut houses the
screw and helps in the smooth movement of the vice's sliding jaw. Since it undergoes
continuous sliding motion and must resist
wear and corrosion,
phosphor bronze is preferred due to its
self-lubricating properties and durability.
·
Corrosion resistance – Protects against rust and environmental factors.
·
Good machinability – Easily shaped into precise threads.
·
Reduces galling – Prevents excessive friction between metal components.
·
Strong yet ductile – Withstands repeated clamping and loosening forces.
