How Are Carabiners Made? From Metal to Finished Hardware

How Are Carabiners Made?

A carabiner looks simple.

A curved metal body, a gate, a hinge, and sometimes a locking sleeve.

But manufacturing a reliable carabiner involves much more than bending a piece of metal into shape.

The manufacturing process depends on the material and intended application.

Climbing carabiners, industrial connectors, and general-purpose accessory clips may use different materials, forming methods, testing requirements, and finishing processes.

That is why the first step is always understanding the product.

Step 1: Define the Application

Before production begins, the manufacturer needs to know what the carabiner will be used for.

For example:

• Climbing

• Outdoor gear

• Camping

• Hiking

• Pet accessories

• Bags

• Keychains

• Rigging

• Industrial hardware

This decision affects almost everything that follows.

A safety-critical climbing connector requires a very different development process from a decorative accessory clip.

Step 2: Select the Material

Common carabiner materials include:

Aluminum Alloys

Aluminum is widely used where low weight is important.

Steel

Steel can provide robust mechanical performance and durability.

Stainless Steel

Stainless steel can be attractive for applications exposed to moisture or corrosive environments.

Other Metals

General hardware manufacturers may also use zinc alloy and other materials for accessory-style carabiners and clips.

Material selection should be based on the intended product rather than simply choosing the strongest-looking metal.

Step 3: Design the Carabiner

The next stage is product design.

Engineers consider:

• Overall shape

• Cross-section

• Gate opening

• Hinge position

• Nose design

• Locking mechanism

• Weight

• Dimensions

• Surface finish

For climbing products, strength and certification requirements become critical.

For general hardware, the focus may instead be on usability, appearance, corrosion resistance, and production efficiency.

Step 4: Tooling Development

Custom metal hardware usually requires tooling.

A manufacturer may create a mold, die, fixture, or forming tool based on the product design.

Tooling accuracy matters because it affects the consistency of production parts.

DuraStark's current manufacturing information includes more than 1,000 hardware molds, supporting customized hardware production.

That capability can be useful when customers require non-standard shapes or branded hardware.

Step 5: Forming the Metal

The forming process depends on the material and design.

For aluminum climbing carabiners, cold forging and hot forging are two established manufacturing approaches. A technical guide from Climb On Equipment describes both processes and notes that forging is followed by operations such as smoothing, drilling, surface treatment, assembly, and inspection.

The basic idea is to transform metal stock into the required carabiner shape.

Step 6: Removing Sharp Edges

After forming, the part may have edges or surface irregularities.

These need to be removed.

Processes may include:

• Tumbling

• Deburring

• Grinding

• Polishing

The exact method depends on the material and product design.

For outdoor hardware, a clean surface is important not only for appearance but also for handling.

Step 7: Machining

Some carabiners require additional machining.

This can include:

• Drilling

• Cutting

• Threading

• Slotting

• Precision finishing

For example, holes may be needed for the gate or hinge components.

Step 8: Surface Treatment

Surface treatment depends on the material.

Aluminum products may use anodizing.

Steel products may use different protective finishes.

Stainless steel may require its own finishing process depending on the desired appearance and corrosion performance.

A surface finish can affect:

• Appearance

• Corrosion resistance

• Surface hardness

• Brand identity

Step 9: Gate and Lock Assembly

A carabiner is not complete when the metal body is finished.

The gate needs to be installed.

Depending on the design, the assembly may include:

• Gate

• Hinge pin

• Spring

• Locking sleeve

• Other small components

The gate needs to open smoothly and return correctly.

Locking models require additional checks to make sure the locking mechanism functions as designed.

Step 10: Inspection

Inspection is one of the most important stages.

Depending on the product, manufacturers may check:

• Dimensions

• Surface finish

• Gate movement

• Assembly

• Locking function

• Material

• Appearance

• Strength

For climbing and other safety-critical products, testing and certification requirements are much more demanding.

Mammut notes that climbing carabiners are subject to strict production requirements and that relevant strength and certification information is important when selecting climbing equipment.

Why Manufacturing Process Matters

Two carabiners can look almost identical but perform differently.

The difference may come from:

• Material grade

• Cross-section

• Heat treatment

• Forming process

• Machining tolerance

• Surface treatment

• Assembly quality

• Inspection

This is why choosing a manufacturer is not simply about comparing unit prices.

Custom Carabiner Manufacturing

For brands, custom production can involve much more than adding a logo.

A custom project may include:

Concept

↓

Drawing

↓

Material selection

↓

Tooling

↓

Prototype

↓

Testing

↓

Production

↓

Inspection

↓

Finishing

↓

Packaging

The exact process depends on the product.

What Should You Give a Carabiner Manufacturer?

If you are requesting an OEM quote, useful information includes:

• Product drawing

• Dimensions

• Material preference

• Expected quantity

• Intended application

• Surface finish

• Color

• Logo requirements

• Packaging requirements

• Target market

If you do not have a complete drawing, a physical sample or basic concept can still be a useful starting point.

DuraStark Carabiner Manufacturing

DuraStark Metal Corp., Ltd. specializes in metal hardware development and production for international customers.

Its product range covers outdoor accessories, pet hardware, rigging hardware, and general hardware.

The company has more than 220 employees, 18 technical staff, and more than 1,000 hardware molds at its current production base.

Its OEM approach combines product development, tooling, manufacturing, finishing, and quality control.

For a custom carabiner project, the final manufacturing process would depend on the design, material, intended application, and required specifications.

FAQ

What metal are carabiners made from?

Depending on the application, carabiners can be made from aluminum alloys, steel, stainless steel, and other metals.

Are carabiners forged?

Some carabiners, particularly climbing carabiners, are manufactured using forging processes. Other general-purpose clips may use different forming or manufacturing methods.

Can carabiners be customized?

Yes. General-purpose hardware carabiners can be customized in areas such as shape, dimensions, material, finish, color, and branding, depending on production requirements.