A knurl is a part of a
stud for a
wheel.
Basically, there are three parts to the stud, the
head, the knurl, and the
shaft.
The knurl lies between the
head and the shaft. The purpose of the knurl is to keep the stud securely within the hub of the wheel, since the shaft must slip through the hub easily and be tightened with a
nut.
The knurl is an area just below the head that is thicker than the shaft so that it wil fit snug when hammered into the hub of a wheel. The knurl will often have a small grid cut into it to make it catch onto the inside of the
hub and thus make is hold better.
Here is a basic
ASCII sketch of a stud, please excuse me if it's rough, I'm not very
talented in the
ACSII area.
|---|
| |
| |
/------/| |
------/ | h |
shaft | knurl| e |
------\ | a |
\------\| d |
| |
| |
|---|