Metal Round Wing Nut

Understand the general features of the product：

The Metal Round Wing Nut is a manually tightened fastener that has two circular "wings" (i.e. wing plates) and a threaded central part. The surfaces of these wing plates are smooth and curved outward, allowing you to easily tighten and loosen it without any difficulty. It has no sharp edges that could hurt your fingers. This metal material - usually carbon steel and coated with zinc or stainless steel - remains sturdy and durable even after repeated use. The threads are formed by rolling and are very smooth during use. It is used in conjunction with standard bolts and washers. It is commonly found in covers, clamps, adjustable furniture, or any parts that are frequently disassembled.

Specification of Metal Round Wing Nut:

Manufacturing quality control:

Here’s how we control quality when making Metal Round Wing Nut. Nothing fancy—just the checks that matter.

（1）Raw material inspection

Before production, we will conduct inspections. The specifications and diameters must match the requirements of the order.

Cold heading monitoring

At the beginning of production, the machine will test the samples. We will check the shape of the flange - ensuring there are no missing materials, no cracks, and no sharp burrs. The ears should be evenly round.

（2）Thread rolling control

The thread is formed by rolling. The rolled thread should look shiny and uniform.

（3）Hardness and strength testing

For carbon steel nuts or stainless steel nuts, we will take samples for hardness testing.

（4）Surface quality inspection

Inspect the coated nuts to confirm that the coating thickness and coverage uniformity have no exposed areas and no peeling phenomena.

（5）Final visual inspection and packaging inspection

Before packing, check that the wing pieces are smooth and free of burrs, and that the products have no cracks.

After confirmation, place them in plastic bags or boxes with clear labels. Prepare for transportation.

Usage steps：

The processing steps for Metal Round Wing Nut are not complicated. They mainly involve cold heading to form the shape and then threading.

（1）Raw material preparation

Round wire rods, commonly made of carbon steel (such as 1010, 1022) or stainless steel (304, 316).

First, draw the wire rods to the required diameter, then perform spheroidizing annealing to make the material softer, which is convenient for subsequent cold heading.

（2）Cold heading forming (core)

Using a multi-station cold heading machine, the wire is cut and then continuously stamped several times in one machine. In one operation, both the two round ears (wings) and the middle nut body are produced.

First workstation: Pre-bending, creating the basic shape outline

Subsequent workstation: Press out the circular wings on both sides and the hexagonal or circular base in the middle.

（3）Thread Rolling (Thread Machining)

Use a threading machine or a thread rolling machine to roll out the internal thread.

Thread rolling will make the thread surface more dense and smooth.

（4）Tap Thread (If it is a Through Hole)

If the nut is designed as a through hole (not a blind hole), it is necessary to use a tap to re-thread the internal thread again to ensure that the thread is smooth and the stop gauge can stop properly.

（5）Surface Treatment

Galvanization: The most common type is electroplating with blue-white zinc or yellow zinc.

Darkening: Short-term rust prevention, dark color, suitable for dry environments

Stainless steel: No surface treatment required. Simply polish or passivate.

Others: Hot-dip galvanizing, Dacromet coating, etc., used for outdoor heavy corrosion protection

（6）Quality Inspection

Checking the thread with a gauge set

Wing shape inspection (checking for missing materials and burrs)

Hardness inspection

Salt spray test (per customer requirements)

（7）Packaging

According to customer requirements, it can be packed in bulk, in plastic bags, in paper boxes or on pallets.