Prong

Definition and structure

The buckle pin is a movable part found in pin-type buckles. It attaches to a central shaft in the buckle body, and by passing its tip through a hole in a belt or other material, it allows for step-by-step adjustment and fixing of the tightening position.

A typical buckle consists of a frame, a central shaft, and a pin. The base of the pin pivots on the shaft, and the tip is shaped to easily fit into a hole. It's important to note that the pin itself is not referred to as the name of the entire buckle.

Materials and finish

The tsuku rod is made from metals such as brass, iron, die-cast metals primarily composed of zinc, and stainless steel. The material, wire diameter, cross-sectional shape, and base structure are selected according to the required strength, weight, appearance, and usage environment.

Metal surfaces may be finished with plating or paint. Because rust, discoloration, and wear of the plating may occur due to sweat, moisture, friction, and washing, we check the corrosion resistance and appearance changes of the main frame and connecting rod.

How to express size

Buckle sizes are often indicated by the inner dimensions of the frame through which the belt or tape passes, i.e., the threading width. The basic rule is to match the threading width with the width of the tape being used, ensuring that it passes through smoothly, including its thickness, and that there is no excessive lateral wobble.

The length of the ferrule alone is not enough to determine suitability. The diameter and length of the holes, the spacing between the holes, and the thickness of the belt material are designed in relation to the thickness of the ferrule and the shape of the tip. If the holes are too small, it will be difficult to thread the belt through, and if they are too large, it will affect the retention and appearance.

• Inner dimensions of the buckle frame and the width of the tape to be used
• Thickness of tape, leather, synthetic leather, etc.
• Thickness, length, and tip shape of the tsuku stick
• Belt hole dimensions, location, and reinforcement method

Main applications

Buckles with a pin are used for belts and prong buckle on trousers, skirts, and coats, as well as for bag straps, aprons, and uniforms. They require adjustment by hole position and are suitable for designs where the buckle is visible.

Depending on the applications, the belt may be pulled forcefully or repeatedly put on and taken off. Even for fashion applications, the weight of the product, the expected load, and any snagging during wear are taken into consideration to create a structure that is less likely to break, deform, or come off the connecting rod.

How to choose and points to note

When selecting a buckle, we verify not only the width of the loop but also that the buckle rod reaches the hole securely and that it can be operated with the correct combination of buckle frame and belt thickness. For thick or rigid materials, hole reinforcement and the precision of hole placement also affect durability and operability.

For products using metal parts, we verify the operation of the metal detection process. The need for needle detector compatible is determined not by the buckle itself, but by the material and specifications of the entire buckle. For products for children, the sharpness of the tip, skin contact, and the risk of detachment or breakage also need to be evaluated.

• Strength against tensile forces and resistance to deformation during use.
• The impact of buckle weight on the product's drape and wearing comfort.
• Checking for rust and discoloration due to sweat, moisture, and washing conditions.
• Whether or not needle detector compatible is required and the inspection method for the entire product.

FAQ