Azusa Engineering 3/8" Drilled Shank King Pin - 4.0" Length - Grade 5 Steel

When you are upgrading your kart and parts for the upcoming season, the Azusa Engineering 3/8-inch Drilled Shank King Pin is the ultimate foundation for razor-sharp steering response. Whether you are tuning a high-compression setup with forged engine pistons, dialing in a walbro carb, or restoring adult go karts for sale, your steering precision dictates your lap times. This heavy-duty 4.0-inch king pin eliminates front-end slop, ensuring your steering inputs translate directly to the asphalt. A rigid front end means less scrubbing in the corners and higher exit speeds down the straightaway.

Grade 5 Steel for Maximum Cornering Loads

High-speed sweepers, aggressive braking zones, and hopping the curbs put immense stress on your kart's spindles. Machined from ultra-tough Grade 5 steel, this Azusa king pin resists bending and sheer forces, keeping your camber and caster locked in exactly where you set them. The precision-drilled shank allows for a secure castle nut and safety wire installation, guaranteeing your hardware stays put even when you are banging wheel-to-wheel in the final lap. It is the perfect chassis complement when you are maximizing your engine's power output with a fresh lo206 carburetor kit. If your chassis flexes or your king pin bends, all that horsepower is wasted.

Technical Specifications & Track-Ready Features

• Grade 5 Steel Construction: Handles extreme steering stresses, heavy braking, and high-G cornering without bending or deflection.
• Precision Drilled Shank: Specifically designed for use with a 3/8-24 castle nut (AE8536) and safety wire or cotter pin for fail-safe retention.
• 4.0-Inch Overall Length: Perfectly sized to suit standard kart spindle depths, C-brackets, and yoke assemblies.
• 3/8-24 Fine Thread Pitch: Provides superior clamping force and micro-adjustability for your steering assembly, preventing mid-race loosening.
• Zinc-Plated Finish: Actively shields the raw metal against rust and corrosion during wet weather races or humid trailer storage conditions.
• Reduced Steering Play: Tight manufacturing tolerances eliminate front-end vibration, delivering unparalleled track feel and driver feedback.
• Universal Compatibility: Fits a wide range of vintage and modern racing chassis requiring a 3/8" diameter king pin setup.

Don't let a compromised front end scrub your speed or ruin your race weekend. Secure your spindles with Azusa's proven, track-tested hardware and hit every apex with absolute confidence. When fractions of a second matter, trust the components that keep you pointed toward the checkered flag.

Frequently Asked Questions

Q: Why is the shank drilled on this king pin?

A: The precision-drilled hole is designed for use with a castle nut and a cotter pin or safety wire. This is a critical safety feature in racing that prevents the nut from vibrating loose during high-speed cornering or heavy track vibration.

Q: How do I know if this 4.0-inch king pin will fit my kart?

A: This king pin is designed for standard kart spindles and C-bracket assemblies that utilize a 3/8-inch diameter bolt. Measure the total width of your spindle yoke and bracket assembly to ensure the 4.0-inch length provides enough clearance for the nut and safety hardware.

Q: Can I use this king pin for both vintage and modern racing karts?

A: Yes, this is a universal-style component. As long as your chassis requires a 3/8-inch diameter king pin, this Grade 5 steel bolt is an excellent upgrade for both vintage restorations and modern racing chassis.

Q: Does this king pin come with the castle nut?

A: This product is the king pin bolt itself. We recommend pairing it with a high-quality 3/8-24 castle nut (such as Azusa AE8536) to take full advantage of the drilled shank for secure retention.

Q: Why choose Grade 5 steel over standard hardware store bolts?

A: Standard hardware store bolts are often not rated for the high-G cornering loads and shear forces experienced in karting. Grade 5 steel provides the necessary tensile strength to prevent the pin from bending, which keeps your camber and caster settings consistent throughout the race.

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