Engines and Components› Cylinder Heads and Components

InlinePro

M11 Xtreme Duty Head Stud Set

$242.45

SKU: IP-HS-K20C1

Special Order
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Overview

The Inline Pro K20C1 M-series M11 Xtreme Duty head stud set is designed for enhanced performance and reliability. These studs are constructed from the highest grade premium American alloy, subjected to rigorous heat treatment and testing. With a minimum tensile strength of 230kpsi, they offer superior durability and resistance to hydrogen embrittlement compared to other materials.
Show original supplier description
The Inline PRO K20C1 M-series M11 Xtreme Duty Head Stud Set is engineered for high-performance K20C1 engines, specifically for the Honda Civic Type R (FK8 and FL5) and Acura Integra Type S (DE5). These head studs are manufactured from the Highest Grade Premium American Alloy, undergoing rigorous heat treatment and testing to ensure exceptional strength and longevity. Boasting a minimum tensile strength of 230kpsi, they provide a significant upgrade over stock fasteners and are not prone to hydrogen embrittlement, unlike L19/H11 materials. Unlike other head studs that may be necked down or undercut, the Inline Pro M-series utilizes a True-beam design throughout the entire length of the stud. This design promotes superior clamping force and allows for more consistent and accurate torque values, crucial for maintaining head gasket integrity under demanding conditions. The kit includes all necessary components for installation: studs, nuts, washers, specialized lube, and detailed instructions. This head stud set is compatible with the following vehicles: * 2017 - 2021 Honda Civic Type R FK8 * 2023+ Honda Civic Type R FL5 * 2023+ Acura Integra Type S

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandInlinePro
Part NumberIP-HS-K20C1
CategoryEngines and Components
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy