Twist Lock

Definition and Overview

A twist-lock fastener consists of a rotating knob visible on the front and a corresponding receiving part. The opening is closed by rotating the knob through the hole or hook in the receiving part and then returning it to its original position. Often used on bag flaps and covers, it serves both a functional and decorative purpose.

These are also called twist locks. However, the name and specific shape may vary depending on the supplier. They differ from insert locks, which are secured by inserting, and magnetic buttons, which close using magnetic force, in their fastening mechanism.

Materials and structure

The main body is made of metals such as brass, zinc alloy die-cast, and stainless steel, and the surface may be finished with plating or paint. Since the material may differ for each component, do not judge the material by appearance alone, but check the specifications.

Mounting methods include screw fastening, bending and securing the legs, and cap and close post. The thickness of the rotating part, the engagement with the receiving part, and the required space including the fixing parts on the back are checked, and the design is made in accordance with the composition of the outer material and core material.

• Rotating knob or plate on the front side
• Mounting bracket to be attached to the flap or main body.
• Fastening components such as screws, washers, and cap and close post

How to express size

The size of a twist fastener is generally indicated by the width, height, thickness, and mounting hole positions of the main body. For fasteners designed to accommodate tapes or belts, the internal dimensions of the pass-through area are also important. Internal dimensions refer to the actual width that can be passed through the inside of the fastener and differ from the external dimensions.

The width of the tape to be threaded through should be chosen in relation to the inner dimensions of the metal fitting. If the tape is wider than the inner dimensions, it cannot be threaded through, and even if it is almost the same width, it may be difficult to thread through depending on the thickness and how the edges are finished. In areas where mobility is required, prototypes should be made to check the overlap of the tape thickness and seam allowance.

Main applications

It is mainly used for flaps and openings on handbags, shoulder bags, backpacks, backpack, pouches, and other similar items. It is often combined with materials that maintain their shape well, such as leather, synthetic leather, and thick woven fabrics.

In clothing, it is sometimes used as a belt-like decoration or to fasten pocket flaps. However, due to its weight and stiffness, care should be taken to avoid rubbing or sagging when used on thin fabrics, highly stretchy fabric, or areas that come into direct contact with the skin.

How to choose and points to note

As a general rule, twist fasteners should not be used as standalone load-bearing components, such as at the handle connection points of bags that are subjected to loads. Considering the number of times the bag is opened and closed, the weight of the contents, and the likelihood of snagging, the durability of the rotating parts and the strength of the mounting parts should be checked in a state close to the finished product.

The weight of the metal fittings affects the feel of the product and how the flap hangs. Plated items may discolor or deteriorate due to friction, sweat, moisture, and cosmetics. Materials containing copper, such as brass, may develop verdigris depending on the usage environment.

For products intended for children or those involving metal detection processes, we pre-check their reaction to metal detectors and their suitability for needle detector compatible . Furthermore, for applications requiring consideration of nickel allergies, we verify the surface treatment and nickel free specifications.

FAQ