Definition

1. Noun:
   • A central pivot bolt in a mechanical assembly: A kingbolt is a primary vertical bolt or pin that serves as the main pivot point in a structure, allowing connected parts to rotate or turn around it.
   • A steering joint bolt in a vehicle: Specifically, in automotive contexts, a kingbolt is the bolt that forms the central pivot for the steering mechanism, connecting the axle to the steering knuckle and enabling the front wheels to turn.

Usage and Examples

• Noun:
  • The mechanic replaced the worn kingbolt to fix the vehicle's loose steering.
  • In older wagon designs, the front axle swiveled around a large kingbolt.

Advanced Usage and Technical Context

• "Kingbolt" vs. "Kingpin": In modern technical English, "kingpin" is the far more common term for the steering pivot in vehicles. "Kingbolt" is often used interchangeably but may be considered slightly archaic or specific to certain mechanical designs (e.g., early automobiles, horse-drawn carriages, or some industrial machinery).
  • While reviewing the antique tractor's schematics, he noted the part listed as a "kingbolt."

Variants and Related Words

• Kingpin (noun): The modern, predominant synonym for the steering pivot. It can also figuratively mean the most important person in an organization.
• Pivot bolt (noun): A general term for any bolt acting as a central point of rotation.
• Steering knuckle (noun): The component that houses the kingbolt/kingpin and connects to the wheel.

Synonyms

• Kingpin: The central pivot pin in a steering mechanism.
• Pivot pin: A pin serving as a central point of rotation.
• Main pin: A primary supporting or pivoting pin.

Notes on Meaning

• The term kingbolt is highly specific to mechanical and automotive engineering. It does not have common idiomatic or figurative uses. Its core meaning consistently relates to being a central, load-bearing pivot.

Noun

1. bolt that provides a steering joint in a motor vehicle