Hanging bolts, also known as double-end bolts, are bolts that have threads on both ends, designed for hanging items or securing objects in various industrial, construction, and mechanical applications. They are typically used to suspend equipment, lighting, or other objects from ceilings or other structures.

1. Thread Size (Diameter)

Thread diameter is one of the key dimensions of a hanging bolt. Common sizes include:

M6 (6 mm diameter)

M8 (8 mm diameter)

M10 (10 mm diameter)

M12 (12 mm diameter)

M16 (16 mm diameter)

M20 (20 mm diameter)

M24 (24 mm diameter)

M30 (30 mm diameter)

The size is usually indicated in either metric (M) or imperial (inches) measurements.

2. Length

The length of a hanging bolt can vary based on the intended application. It is the measurement from one end to the other, excluding the thread length.

Standard Lengths: Common lengths range from 50 mm to 300 mm, but they can be customized depending on the project requirements.

3. Thread Type

Metric Threads (M): These bolts are most commonly used worldwide and have a coarse thread pitch. For example, M10 bolts will typically have a 1.5 mm thread pitch.

Unified Thread Standard (UTS) or Imperial Threads: Used in the U.S., often designated as 1/4-20 or 3/8-16 (which indicates diameter and threads per inch).

4. Material

Steel: Common for most applications, and can come in a variety of grades such as Grade 5 or Grade 8 for higher strength.

Stainless Steel: Used in corrosive environments, offering resistance to rust and corrosion.

Galvanized Steel: For outdoor or wet environments, as it has a protective zinc coating.

Brass or Aluminum: Less common but used for decorative purposes or lightweight applications.

5. Thread Length

The thread length is the portion of the bolt where the threads are present. This varies based on the size and function of the bolt, with longer threads allowing for greater flexibility in attaching or securing items.

6. Head Type

While hanging bolts typically do not have a traditional head like standard bolts, some may feature a hexagonal or square section for easier installation with a wrench.