KPMI Cylinder Stud Kits - Studs (pkg. OF 8) — Harley-Davidson Road King, Tri Glide Ultra Classic, Electra Glide Ultra Limited (2017-2020)

KPMI cylinder stud kits provide eight high-performance studs for V-twin motorcycle engines, manufactured from premium grade 8740 material heat-treated to 180,000 psi yield strength. Threads are rolled post-heat-treat to maximize fatigue resistance and retain compressive stress at sustained high temperatures.

Features

• Grade 8740 material heat-treated to 180,000 psi yield strength
• Threads rolled after heat treating for maximum fatigue life
• Slight interference fit design maintains thread contact at high temperature
• Centerless ground for concentricity and precision
• Premium black oxide finish

Specifications

• Brand: KPMI
• Manufacturer Part #: 20-21040
• Quantity: 8 studs per package
• Length: 5 in
• Width: 1 in
• Height: 1.4 in
• Weight: 8 lbs

Fitment

Fits V-twin motorcycle engines, including Harley-Davidson and Indian Motorcycle models.

Frequently Asked Questions

What material are these studs made from?

Premium grade 8740 steel heat-treated to 180,000 psi yield strength, with rolled threads for maximum fatigue resistance.

Why are the threads rolled after heat treating?

Rolling threads post-heat-treat retains maximum compressive stresses, ensuring the longest possible fatigue life under sustained high engine loads.

How many studs are in the package?

Eight studs per package, which is a common cylinder stud kit quantity for V-twin engines.

What finish do these studs have?

Premium black oxide treatment for excellent appearance and corrosion resistance.