Do ASTM Grades Require a Specific Head Style?
When selecting an ASTM grade of fastener for a particular application, the chemical and mechanical requirements are normally considered first, but there are some fastener specifications that require a certain head style as well. Below is a chart showing some common ASTM grades and whether or not they have requirements for the pattern of forged head. It is important to keep in mind that this chart only specifies requirements in regards to headed bolts.
|ASTM Specification||Grade||Specified Head Configuration|
|F3125||A325||Heavy Hex Structural|
|F593||Alloy Group 1||Standard Hex|
|Alloy Group 2|
|* Head styles are unless otherwise specified.|
As you can see, most of the grades shown in this chart have a head style for which they are normally specified, however in most cases this can be changed if needed. Many of these ASTM grades may also allow for other configurations such as bent anchor bolts and straight rods.