King Pin – Steel Bright Bar Applications
A king pin is a critical steering component used in the front axle assembly of
heavy vehicles, tractors and off-road equipment. It connects the steering knuckle
to the axle beam and allows controlled pivoting of the wheel assembly.
Because it carries high vertical loads, impact forces and steering stress,
king pins are manufactured from steel bright bars with high strength,
wear resistance and dimensional accuracy.
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Where King Pins Are Used
- Trucks and heavy commercial vehicles
- Tractors and agricultural machinery
- Buses and transport vehicles
- Construction and mining equipment
- Off-road utility vehicles
Why Steel Bright Bars Are Used for King Pins
- High load-bearing capacity
- Excellent wear resistance
- Accurate diameters for bush fitment
- Good machinability for grooves and holes
- Reliable heat treatment response
King Pin – Typical Geometry & Machined Features
King pins generally have lubrication grooves, cross holes and precision
diameters to suit bronze or polymer bushes. Surface hardness and finish
directly affect service life.
Common Steel Grades Used
| Application Type | Typical Steel Grades |
|---|---|
| Standard Commercial Vehicles | EN8, EN8D, C45 |
| Heavy-Duty & Off-Road Equipment | EN19 |
| High Impact & Fatigue Use | 42CrMo4 |
Typical Processing & Operations
- Cold drawn or peeled bright bars
- CNC turning and drilling
- Grooving and cross-hole machining
- Induction hardening
- Grinding for precision fit
Bright Bar Sections & Supply Form
- Round bright bars
- Close tolerance diameters
- Straight lengths for machining
Manufacturing & Quality Considerations
- Dimensional accuracy for bush life
- Surface hardness for wear resistance
- Controlled straightness
- Traceability for OEM supply
Related Components
- Stub Axles
- Steering Knuckles
- Axle Pins
Why Steelmet Industries?
- Bright bars engineered for steering components
- Supply of EN8, EN19 and alloy steel grades
- VD route steels available for safety-critical parts
- Inspection support via NABL-certified laboratories
FAQs
Why are king pins critical for steering?
They act as the pivot point for wheel steering and carry vertical vehicle load.
Which grade is most commonly used?
EN8 and EN19 are widely used depending on vehicle weight and duty cycle.
Are king pins hardened?
Yes. Induction hardening is commonly applied to improve wear resistance.
Contact for Enquiries
For sourcing steel bright bars for king pin manufacturing: