From Scrap to Strength: The Manufacturing Journey

Every dumbbell, weight plate, and barbell starts as raw material. At Anka Force Sport, those raw materials are predominantly recycled — scrap cast iron and reclaimed rubber that would otherwise end up in landfill. Our factory in Tekirdağ, Çorlu transforms these materials into commercial-grade gym equipment used in facilities across 50+ countries.

This article takes you inside the manufacturing process, from raw material to finished product.

Step 1: Raw Material Sourcing and Preparation

Recycled Cast Iron

Cast iron is the core material for dumbbells and weight plates. We source recycled cast iron — primarily from industrial scrap — which is sorted, cleaned, and inspected before entering the production line. Recycled cast iron has the same density and structural properties as virgin material, making it ideal for precision weight manufacturing.

Recycled Rubber

The rubber used in our coatings comes from recycled sources. This rubber is processed, cleaned, and compounded with binding agents to achieve the right hardness, elasticity, and durability for gym equipment applications.

Step 2: Casting — The Foundation of Every Weight

The casting process is where raw material becomes a recognizable shape:

Mould preparation: Precision moulds are created for each weight size, ensuring consistent dimensions and weight accuracy within ±2–3% tolerance
Melting: Recycled cast iron is melted in furnaces at extremely high temperatures
Pouring: Molten iron is poured into moulds and allowed to cool
Finishing: Cooled castings are removed, deburred, and inspected for defects

This casting process produces the raw discs that become weight plates and the cores that become dumbbells.

Step 3: Rubber Coating — Protection and Performance

For rubber-coated products — bumper plates, rubber dumbbells, rubber Olympic plates — the cast iron cores undergo a coating process:

Surface preparation: Cast iron is cleaned and sometimes treated to ensure the rubber bonds securely
Rubber application: Recycled rubber compound is applied under heat and pressure (vulcanization), creating a permanent bond between the rubber shell and the iron core
Curing: The coated product cures at controlled temperatures to achieve optimal hardness
Trimming: Excess rubber is trimmed for a clean, professional finish

Step 4: Assembly — Building Dumbbells

Dumbbell manufacturing adds an assembly step:

Cast iron discs (rubber-coated or chrome-plated) are paired for weight accuracy
A steel handle with knurled grip is fitted
Discs are permanently attached to the handle — no loose parts, no risk of disassembly during use
Each dumbbell is weighed and verified before acceptance

Step 5: Quality Control

Quality control runs throughout the process, not just at the end. Key checkpoints include:

Material inspection: Incoming recycled materials are tested for composition
Weight verification: Every product is weighed to ensure it falls within tolerance
Visual inspection: Surface finish, coating integrity, labelling accuracy
Drop testing: Bumper plates undergo repeated drop tests to verify durability
Dimensional checks: Sleeve bore, handle diameter, and overall dimensions are verified

Step 6: Custom Branding and OEM Production

A significant portion of our production is OEM — equipment manufactured under our clients' own brand names. The branding process includes:

Custom colour rubber coatings
Branded logos embossed or printed on plates and dumbbell heads
Custom packaging with client branding
Private-label documentation and warranty cards

With 100+ OEM partners worldwide, Anka Force Sport has refined this process to deliver consistent brand representation across every unit produced. Learn more about our OEM capabilities.

The Sustainability Advantage

By using recycled cast iron and recycled rubber, we reduce the environmental impact of gym equipment manufacturing. This isn't just a marketing point — it's built into our operations since 2002. The recycled materials we use perform identically to virgin materials in terms of weight accuracy, durability, and finish quality.

Interested in understanding our manufacturing process in more detail? Contact us to arrange a virtual factory tour or discuss your equipment requirements.