Solid Cast Iron Construction | Glossy Black Finish | 50.4mm Precision Bore | OEM Manufacturer
Product Overview
The SP004 Cast Iron Olympic Weight Plate represents the foundation of any serious strength training facility—a durable, reliable, and cost-effective plate engineered for longevity and performance. Manufactured from high-grade cast iron with a smooth glossy black finish, these plates offer exceptional durability at a competitive price point.
As the original manufacturer, we produce these plates with precision-machined 50.4mm bores for a perfect fit on Olympic and powerlifting barbells, bold weight markings for easy identification, and robust construction that withstands daily use in commercial and home gym environments.
Available in a full range from 0.5lb to 45lb, sold in pairs or complete sets, the SP004 is the go-to choice for fitness brands, gym chains, and retailers seeking quality cast iron plates without premium pricing.
1. Key Features
| Feature | Benefit |
|---|---|
| Solid Cast Iron Construction | Durable, impact-resistant, built for heavy daily use |
| Glossy Black Finish | Professional appearance, resists rust with proper care |
| Precision Machined Bore | 50.4mm diameter – smooth fit on all Olympic and powerlifting barbells |
| Bold Weight Markings | Clear, easy-to-read numbers for quick identification |
| Wide Weight Range | 0.5lb to 45lb – accommodates all fitness levels and training programs |
| Sold in Pairs | Balanced loading for symmetrical training |
2. Material & Construction – Cast Iron Durability
| Specification | Detail |
|---|---|
| Material | High-grade gray cast iron |
| Casting Method | Sand casting with quality control on density and consistency |
| Finish | Glossy black paint – smooth, professional appearance |
| Bore | Precision machined after casting to 50.4mm ± 0.2mm |
| Weight Tolerance | ±2% – industry standard for cast iron plates |
| Durability | Withstands repeated use in commercial and home gym settings |
3. Technical Specifications – SP004 Series
| Parameter | 0.5lb | 1.25lb | 2.5lb | 5lb | 10lb | 25lb | 35lb | 45lb |
|---|---|---|---|---|---|---|---|---|
| Material | Cast iron with glossy black finish | |||||||
| Bore Diameter | 50.4mm ± 0.2mm (fits all Olympic barbells) | |||||||
| Weight Tolerance | ±2% | ±2% | ±2% | ±2% | ±2% | ±2% | ±2% | ±2% |
| Finish | Glossy black paint | |||||||
| Sold As | Pairs | Pairs | Pairs | Pairs | Pairs | Pairs | Pairs | Pairs |
4. Available Configurations
Individual Pairs
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0.5lb, 1.25lb, 2.5lb, 5lb, 10lb, 25lb, 35lb, 45lb
Complete Sets (Custom Configurations Available)
| Set Type | Contents |
|---|---|
| 100lb Set | Pairs of 5lb, 10lb, 25lb |
| 160lb Set | Pairs of 5lb, 10lb, 25lb, 35lb |
| 250lb Set | Pairs of 5lb, 10lb, 25lb, 35lb, 45lb |
| 300lb Set | Pairs of 5lb, 10lb, 25lb, 35lb, 45lb (additional 45lb pairs) |
Custom sets available for wholesale orders.
5. Manufacturing Process
As the actual manufacturer, we maintain full control over production quality:
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Raw material sourcing: High-grade pig iron and scrap steel, verified composition
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Casting: Precision sand casting with density control
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Cooling & finishing: Controlled cooling to prevent stress fractures
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Machining: CNC bore machining to 50.4mm ± 0.2mm
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Surface preparation: Cleaning, deburring, and primer application
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Painting: Glossy black powder coat or liquid paint finish
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Weight verification: Batch sampling with calibrated scales
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Packaging: Pairs packed in cartons or bulk export packaging
6. Customization Solutions – OEM/ODM
| Customization Aspect | Options Available |
|---|---|
| Logo / Branding | Silkscreen printed; Laser engraved; Embossed during casting |
| Weight Markings | Custom fonts, colors, or engraved markings |
| Finish | Glossy black (standard); Matte black; Custom colors |
| Packaging | Pairs in color boxes; Sets in branded cartons; Bulk export pallets |
| Set Configurations | Custom weight combinations per your market needs |
| Weight Tolerance | Standard ±2%; Tighter tolerance available upon request |
Minimum Order Quantities:
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Standard finish (black): 50 pairs per weight (mixable across weights)
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Custom logo/finish: 100 pairs per weight (negotiable)
Lead Time:
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Sample order: 2–3 weeks
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20FT/40HQ container: 4–5 weeks
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Custom branding: 5–6 weeks
7. Quality Control
| Test | Method | Standard |
|---|---|---|
| Weight Accuracy | Batch sampling with calibrated scales | ±2% |
| Bore Fit | 100% gauge testing | 50.4mm ± 0.2mm |
| Finish Adhesion | Cross-hatch tape test | No peeling |
| Dimensional Check | Random sampling | Consistent diameter and thickness |
| Durability | Drop test on concrete | No cracking or deformation |
8. Production Capacity
| Capacity Metric | Specification |
|---|---|
| Casting Capacity | 100+ tons per day |
| Machining Capacity | 10,000+ bores per day |
| Monthly Output | 50,000+ pairs (100,000+ plates) |
| Annual Capacity | 600,000+ pairs |
9. Packaging Solutions
Retail-Ready Packaging (Pairs)
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Color box with product information and branding
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Individual wrapping to protect finish
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Labeling with SKU, weight, and barcode
Bulk Export Packaging (Wholesale)
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Heavy-duty export cartons – 2–4 pairs per carton
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Shrink-wrapped pallets with edge protectors
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Container optimization: 20GP / 40HQ loading plans provided
10. Target Applications & Customer Segments
| Customer Type | Value Proposition |
|---|---|
| Fitness Brands (OEM) | Custom branding, retail-ready packaging, consistent quality |
| Gym Chains | Bulk pricing, durable construction for high-traffic facilities |
| E-Commerce Retailers | Mix-and-match container orders, ready-to-ship packaging |
| Commercial Gyms | Affordable, reliable plates for member use |
| Home Gym Retailers | Complete sets, competitive wholesale pricing |
11. Why Choose Us as Your Manufacturer?
| Advantage | Benefit |
|---|---|
| True Manufacturer | Direct factory access—no middleman margins |
| Casting Expertise | In-house foundry with quality control on every batch |
| Precision Machining | CNC bore finishing ensures consistent barbell fit |
| Customization Ready | Full OEM capabilities—logo, finish, packaging |
| Scalable Production | Capacity for both small custom runs and high-volume container orders |
| Global Export Experience | Proven logistics to North America, Europe, Australia, Asia |
