2 Inch / 3.5 Inch, Bolted & Welded Kingpin for Heavy-duty Trailer

Name: 2 Inch / 3.5 Inch, Bolted & Welded Kingpin for Heavy-duty Trailer
Availability: InStock
Rating: 4.5 (89 reviews)

This semi-trailer king pin is the core coupling component to connect tractor head and semi-trailer. We supply two standard mainstream sizes: 2 Inch (50#) for standard load trailers and 3.5 Inch (90#) for super heavy overload vehicles. Two installation structures are optional: bolted detachable assembly type and integrated welded forging type. All products are forged from high-strength alloy steel with overall quenching & tempering heat treatment, strictly following international trailer coupling standards, stable in load bearing, wear-resistant and long service life, widely applied for container trailers, box vans, dump tippers, engineering mining heavy trailers and export semi-trailers.

Description

Item	Specification Details
Standard Sizes	2 Inch (50#) / 3.5 Inch (90#)
Material	High Strength 40Cr Alloy Steel
Manufacturing Process	Hot Forging + CNC Precision Machining + Overall Heat Treatment
Two Mounting Types	1. Bolted Detachable Assembly Type 2. One-piece Welded Forged Type
Surface Treatment	Bolted type: Grinding & Galvanized Anti-rust Welded type: Black Anti-corrosion Spray Painting
Applicable Trailer	2 Inch: Container, Cargo Box, Light & Medium Standard Semi-Trailer 3.5 Inch: Dump Tipper, Mining, Overload Engineering Heavy Trailer
Standard Compliance	ISO 337, GB/T 4606, IATF16949 Automotive Quality Standard
Traction Plate Thickness	Optional 8mm / 10mm / 12mm / 16mm

Core General Advantages

Two universal industry sizes cover all light, medium and heavy-load trailer matching demands, high market compatibility
Premium alloy steel with quenching treatment, high hardness, strong anti-impact and anti-deformation capacity under extreme load
Dual structural design (bolted / welded) to meet different maintenance and working condition requirements
Precise CNC machining ensures perfect fit with fifth wheel coupling, smooth rotation, no jitter during vehicle turning
Strict factory load & wear testing, stable performance for long-distance transportation and rough road operation
Complete surface anti-rust process, effectively resist mud, rain and dust erosion in complex working environments

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