Split Nut – Union, Hexagonal Types, and How to Use

Split Nut – Union, Hexagonal Types, and How to Use

A split nut is a threaded nut divided into two or more pieces. These nuts are used by fixing them together from the outside. The most common use of Split nuts is the applications where it is impossible or difficult to thread the entire nut onto a bolt or stud, such as when space is limited.

When the split nut is open, the nut slides along the screw without rotating. But when it’s closed, it moves like a nut on a screw, which allows it to turn. This design lets the user quickly attach or detach the two halves as needed.

Hexagonal Split Nut

Hexagonal Split Nut

A hexagonal split nut is a popular type of metal split nut that consists of two parts separated by a saw cut. Usually, we use a cap screw to tighten or loosen the two parts of the nut. The significant advantage of using a hexagonal split nut is that it can be easily removed and reused.

Union Split Nut

Union Split Nut

A union split nut is a type of coupling that connects two pieces of pipe. It consists of two halves threaded inside and held together with a bolt or screw. We can see union split nuts commonly seen in plumbing applications where it is crucial to be able to disconnect the pipes for maintenance or repairs.


How to Use a Split Nut

STEP #1: Open

First, unscrew the split nut to open it up. It will allow access to the male thread on your chosen fastener.

STEP #2: Position

Next, position the split nut over the male thread. Make sure that it is lined up correctly before proceeding.

STEP #3: Place

Finally, screw the nut back together until tight. It will hold everything in place and ensure a secure connection.

Advantages of Split Nuts

  1. The split nut is easier to install than the standard nut. A split nut can be placed on a bolt before it is tightened, while a standard nut must be threaded onto the bolt first.
  2. The split nut requires less torque to loosen than the standard nut. Removing a split nut without breaking the strong bond that holds it in place is possible.
  3. The split nut is less likely to damage the mating thread on the bolt due to tightening or loosening.
  4. Additionally, split nuts can be reused multiple times without damage, making them ideal for applications where frequent disassembly and reassembly are required.

Disadvantages of Split Nuts

  1. Split nuts have lower inherent strength than standard nuts. It means that they are more likely to break under stress or strain.
  2. Split nuts are more likely to become loose over time than regular nuts. The split joint between the two halves of the nut can gradually open itself.
  3. Split nuts cost more than standard nuts due to their increased complexity and manufacturing costs.

Applications of Split Nuts

  1. Split nuts commonly use in positioning systems such as lathe machines. In these cases, the split nut allows for fine adjustments without removing and reinstalling the entire assembly each time. It can save a considerable amount of time and effort over traditional methods.
  2. Another common application for split nuts is plumbing applications, particularly for copper pipes that are especially susceptible to thread damage from over-tightening. Using a split nut significantly reduces the risk of damaging the threads, allowing for a secure connection without fear of stripping the threads.
  3. Furniture assembly and picture frame hanging are two popular uses for split nuts. In both cases, making minor adjustments without removing and reinstalling the entire assembly can save time and frustration.
  4. Split nuts give extra support to rods, threads, and bolts. They distribute the load more evenly than a regular nut would.
  5. Designers commonly use Split nuts in many DIY and home improvement projects. They offer a quick and easy way to secure two pieces of material together while allowing for adjustability.


The Split Nut: An Easy to Fit Nut with a Higher Inherent Strength

Split nut – Wikipedia

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