Highest quality Headstuds in the marketplace for the Evo. With 260,000psi strength, these headstuds are the last units you will ever need to keep massive horsepower from lifting the cylinder head at high boost.

Founded in 1960 as A-1 Thread Rolling, the company established itself as a precision centerless grinding and thread rolling facility, making high-quality fasteners and special parts for many of the country’s leading aerospace manufacturers.

A1 Facility and Workshop

In our facility of more than 25,000 square feet, we employ all the precision equipment needed to manufacture and test what are simply the best quality fasteners available on the market today.

Our team takes great pride in their work and in providing A1 customers with the highest-quality fasteners, while ensuring on-time delivery and an unparalleled commitment to customer satisfaction.

In October 2000 A1 joined forces with LISI AEROSPACE, one of the premiere world aerospace fastener manufacturers. Since then, A1 has strongly invested to increase its range of services and development for its customers. While A1 is qualified and manufactures for the aerospace industry, we remain focused and specialized on racing.