Overview
These are main studs, not head studs. Main and head studs serve different purposes—selecting the right one is crucial.
Why Main Studs?
Main studs provide superior clamping force compared to main bolts, reducing wear on block threads and assisting with main cap alignment. Unlike bolts, which twist during tightening, studs remain stationary, reducing the chance of main cap walking under high loads. They are especially beneficial in high-performance applications where increased stability and durability are required.
Disclaimer: Designed to secure crankshaft main bearing caps. This is NOT a head stud kit.
Your application
The right fit comes first.
Browse the compatible applications below, or check your exact vehicle before adding this product to your cart.
Inside the box
Know exactly what arrives.
Included components for this product.
| Qty | Component |
|---|---|
| 20 | M14 main studs · 143 mm inner / 131 mm outer |
| 20 | Nuts (Part # N1601 & N1602) |
| 8 | M8 Bolts |
| 1 | Allen Wrench |
| 1 | Fastener Assembly Lubricant |
| 2 | Socket |
XOTIC 7200 / Material comparison
Tensile & yield strength.
Two measures of strength. Explore the comparison for XOTIC 7200 alloy and 8740 chromoly steel.
Tensile strength
The maximum tensile stress a material withstands before failure.
XOTIC 7200 series
232K PSI
8740 chromoly steel
222K PSI
Yield strength
The stress at which a material begins to deform permanently.
XOTIC 7200 series
212K PSI
8740 chromoly steel
201K PSI
The original comparison identifies an M14 × 237 specimen.
Original method note: ISO 6892-1:2016 or ASTM A370 / ASTM E8/E8M in the US.
Material specification
220–240K PSI
Strength specification
The published tensile-strength range for XOTIC 7200 main studs is 220,000–240,000 psi. Tensile strength describes the material under tension; it is not an installed clamping-force or horsepower rating.
View the test documentation
The linked ATRONA report records a 240,000 psi tensile result for a submitted stud tested in May 2020. This result applies to the submitted sample.
View source reportSee the details
Behind the product.
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Before you begin
A good install starts here.
Review the instructions and any application-specific requirements before you begin.
Before you order
Will this fit my vehicle?
Use the vehicle checker above to confirm your exact application. For an engine swap or an unusual setup, contact XOTIC before ordering.
Are tools and assembly lubricant included?
Yes. The included sockets, Allen tools and assembly lubricant are listed in the kit contents. Check the installation procedure for any additional equipment needed for the complete job.
Should the main bearing bores be checked?
Yes. Check the main bearing bores for size, roundness and alignment after changing the fasteners. If correction is needed, have the machine shop use the final assembly fasteners, lubricant and specified torque when checking and machining the main tunnel.
How does the warranty work?
Review the warranty policy for coverage, eligibility, and claim requirements.
Read warranty termsRegister your warrantyCalifornia Proposition 65 warning
WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov
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