Manufacturer · Fashion & Home Accessories
Types of buckles are divided by three criteria: fastening mechanism (prong, slide, side-release, automatic, double-ring), material (metal, polyester, engineering plastic) and purpose (belt, coat, bag, backpack, shoe). The right choice starts with the mechanism, because it determines whether the belt has holes, how often it will be adjusted and what load it takes. Material and finish come after that.
Types of buckles by mechanism
The mechanism is the most important technical decision. It determines how the strap will be sewn, whether you will punch holes and how quickly the end user will fasten and unfasten the product.
Prong buckle
The classic construction: a frame, a bar and a movable prong that passes through a hole in the belt. It is the standard for leather belts, shoe straps and watch straps. The advantage is precise fixing of the length; the drawback is that holes are needed, and they wear the material over time. The version with a roller on the front of the frame reduces friction on the belt.
Slide buckle (without a prong)
The strap is passed through the frame and held by friction or by a centre bar. It is used on belts for coats, trench coats and dresses, where the belt is tied or simply held. There are no holes, so it is suitable for wool, cotton and synthetic belts that should not be punched.
Side-release buckle
A two-part fastener – a male part with sprung arms and a female part with windows. It fastens with a click and releases by squeezing both sides. This is the typical buckle for backpacks, sports bags, collars and children's products.
Adjuster (tri-glide slider)
It does not fasten but adjusts the length of a shoulder strap or strap. The webbing is threaded through the three bars and is locked by its own tension. It almost always works in combination with a side-release buckle or a ring.
Automatic buckle
It grips the belt with a toothed jaw or an internal track, without holes. It allows adjustment to the centimetre. It is found on men's leather belts and on tactical belts made of dense webbing.
Double-ring buckle
Two D-shaped or round rings through which the strap is passed and turned back. This simple construction is popular on webbing belts, denim accessories and sportswear.
Types of buckles by material
| Material | Strengths | Typical use |
|---|---|---|
| Zinc alloy (zamak) | Casting of complex shapes and logos, many finishes | Fashion belts, bags, shoes |
| Brass | Weight, does not rust, patina | High-end leather belts |
| Steel | High strength at low thickness | Work and technical belts |
| Polyester resin | Colouring to a sample, lightness | Coats, trench coats, dresses |
| Polyacetal (POM), polyamide | Resistance to impact and fatigue, does not corrode | Backpacks, bags, straps, sport |
Metal models are covered in detail in the metal buckles category. Polyester and engineering plastic buckles are in the main buckles category.
Types of buckles by purpose
- For coat and dress belts – slide buckles, often polyester, in the colour of the buttons; widths of about 2–6 cm.
- For leather belts – prong, roller or automatic, metal; the width follows the belt.
- For bags – buckles with a movable bar, adjusters, decorative frames for the flap.
- For backpacks and sports products – side-release buckles and adjusters in engineering plastic.
- For shoes and sandals – small prong buckles for narrow straps.
- For dungarees and workwear – special hook buckles that engage a button.
Shapes and look
Besides the mechanism, a buckle is also chosen by shape: rectangular, square, oval, round, with a curved profile or figurative. Rectangular buckles look stricter and more businesslike, round and oval ones softer and more fashionable. A double buckle (two parallel prongs or two frames) is used on wider belts and gives a pronounced, vintage character. With polyester models there is also a choice of surface – gloss, matt, horn effect, marble or mother-of-pearl.
In collections where the buckle is the main visual accent, it is worth thinking about it at the sketch stage. The size of the frame relative to the belt width, the thickness of the profile and the colour of the finish change the proportions of the whole product. A narrow frame on a wide belt looks simple and contemporary, while a heavy frame on a narrow belt looks decorative and more retro.
How to choose the type of buckle for your product
- Determine the width of the strap or belt in millimetres – the inner opening of the buckle must accommodate it freely.
- Choose the mechanism according to use: daily adjustment, one-off fastening or a purely decorative function.
- Check the thickness of the material. A double wool belt or thick leather requires a taller opening.
- Take the load into account. For backpacks and work belts choose engineering plastics or steel; for fashion products alloy or polyester.
- Coordinate the look with the rest of the hardware – buttons, rings, eyelets and logo plates.
- Ask for a sample and test it with the real material before starting a run.
Common mistakes when choosing
- Measuring the outer size of the buckle instead of the inner opening.
- A heavy metal buckle on a light cotton belt – the weight turns it over and the belt twists.
- A side-release buckle with a width different from the webbing – the webbing bunches or slips out.
- A finish that does not match the zip and eyelets of the same product.
Buckles from the manufacturer – Polkom
Polkom is a Bulgarian manufacturer and wholesaler of garment accessories based in Sofia, with over 30 years of experience. We offer metal, polyester and plastic buckles from stock and made to your design, with a logo and colouring to a sample. Send us the belt width, the material and a photo of the product via the inquiry form – we will suggest suitable models and samples.
