an eyeabolt is a piece of rigging hardware wiht a ------ which means it has a series of spiral grooves cut into it.

Thread

(threaded like a bolt, which is what it is with an eye cast or forged at the head.)

Beware of eyebolts if loaded in tension (pulling out from the attachment) because then the whole load is taken by the thread. They are much safer if loaded mostly in shear.

An eyebolt is a type of rigging hardware that has a shank with threads, which means it has a series of spiral grooves cut into it. The threads of an eyebolt are specifically designed for easy insertion into a mating threaded hole or nut.

If you want to visually understand what an eyebolt looks like and how the threads are formed, you can follow these steps to find images and descriptions:

1. Open your preferred web browser (e.g., Google Chrome, Mozilla Firefox, etc.).
2. Type "eyebolt" in the search bar and press Enter.
3. View the search results, which will likely display a selection of images, product listings, and websites related to eyebolts.
4. Click on the image tab of the search results to specifically focus on images.
5. Browse through the images to find examples of eyebolts. You can click on individual images to view them in more detail.
6. To further understand the concept of threads and how they are cut into the shank of an eyebolt, you can click on text-based search results that provide detailed descriptions or explanations.

By visually exploring images of eyebolts and reading accompanying descriptions or articles, you should gain a better understanding of their physical properties and the specific characteristics, such as the spiral grooves or threads.