You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!
If you have any problems with the registration process or your account login, please contact us. Looking forward to seeing you in the forums and talking about AATVs!
The first two numbers is the type of steel you are looking at. The 40 series is alloy steel. The second two numbers are Carbon content. The higher the number the more carbon content. The more carbon the harder the steel. So 4130 is softer than 4140. If you have them heat treated your heat treater will have to know what type of steel they are dealing with.