Atomic Barra Tool Steel Headstuds

Our head studs are the strongest available in standard size! They are made out of H-13 Tool Steel and come with extra large washers which help spread the load evenly as the nut tightens. 12mm Head stud kit suit BA-on Ford Barra DOHC 6 cyl. Includes 12pt double hex nuts, oversize (28mm OD) washers and instructions. Our studs are long enough that they properly bottom out (there is a bottoming tip) and long enough for full engagement on the nut and thread on the top of the stud. No modifications to the head are required. 

You're looking to compare some serious hardware! It sounds like you need to choose the right stud material for high-performance engine applications. Here's a breakdown of the strengths of those materials and factors to consider:

12mm Stud Material Strengths Comparison (General)

• ARP2000: A proprietary alloy steel from ARP (Automotive Racing Products). It's known for high tensile strength (around 220,000 psi) and good fatigue resistance. A popular choice for connecting rods and head studs in high-performance engines.  
• Chromoly 8740: A type of chrome-molybdenum steel. It offers a good balance of strength (180,000 - 210,000 psi tensile strength), toughness, and fatigue resistance. Commonly used in racing and aerospace applications.  
• L19: A high-strength alloy steel with excellent wear resistance. It has even higher tensile strength than ARP2000 (around 260,000 psi). Often used in demanding applications like high-pressure valve components and fasteners in high-stress environments.
• H13 Tool Steel: A hot-work tool steel known for its high toughness, wear resistance, and ability to withstand high temperatures. While incredibly strong (roughly 300,000 psi, it might be overkill for studs unless you have extreme heat and stress involved or price is comparable to other materials.  

**This is a general material summary generated by Google Gemini Advanced 2.0 FLASH and checked by Atomic. The input was 'I want to compare the strength of 165mm long m12 studs made from ARP2000, cromoly 8740, L19, and H13 tool steel'**