What size is an M13 nut?

An M13 nut is primarily defined by its 13mm metric thread diameter. While the nominal diameter is 13mm, the depth (or thickness) of M13 nuts can vary. Specific types, such as certain brass hexagon nuts, may have a depth of 3mm.

Decoding M13 Nut Dimensions

The "M" in M13 signifies that it is a metric thread. The number "13" directly refers to the nominal diameter of the thread in millimeters. This means the nut is designed to fit a bolt or threaded rod with a 13mm major diameter metric thread. This nominal diameter is the fundamental sizing characteristic for any M13 fastener.

While the thread diameter is consistently 13mm for an M13 nut, other dimensions such as the nut's depth (or thickness) and the wrench size across its flats can vary. For instance, specific M13 fasteners, such as certain brass hexagon nuts, are known to have a depth of 3mm. This relatively shallow depth suggests it might be designed for applications where space is limited or where a full-height nut is not required.

Key Dimensions Summary

The essential dimensions for an M13 nut, including an example of its depth, can be summarized as follows:

Characteristics and Applications

M13 nuts are commonly found in a hexagon shape, allowing for easy tightening and loosening with a standard wrench. Materials can vary widely depending on the application, but examples include brass, which is often chosen for its corrosion resistance and aesthetic qualities in certain fixtures, or other materials like steel for more general or heavy-duty use.

The specific depth of a nut like the 3mm example can indicate its intended application. Thinner nuts are often used in situations requiring a low profile or where the load is not excessively high, as the number of engaged threads contributes to the strength of the connection. They are designed to match M13 threaded rods or bolts, creating secure connections in various assemblies.