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Help Center304 Stainless Steel Ring Precision Machined 50HRC Hardness With Mill Test Report
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Dongguan HonHo Jewelry Co., Ltd. has been a trusted manufacturer of precision metal components since 2010. Our 304 Stainless Steel Ring Precision Machined 50HRC Hardness represents the perfect balance of durability and precision for demanding industrial applications. Each ring is produced under strict quality control, backed by our ISO9001-certified facility spanning 3,000-5,000 square meters and staffed by 51-100 skilled employees. With an annual export value of US$2.5-5 million and shipments to North America, Europe, Asia, and beyond, we deliver reliability that global buyers trust.
This ring is precision machined from 304 stainless steel to achieve a consistent 50HRC hardness, offering excellent wear resistance and dimensional stability. Every batch comes with a Mill Test Report verifying chemical composition and mechanical properties, ensuring full traceability. Whether you need custom sizes, specific surface finishes, or bulk orders, our flexible production capabilities can meet your requirements.
Key Features & Technical Specifications
- Material: 304 Stainless Steel (0.08% C max, 18-20% Cr, 8-10.5% Ni)
- Hardness: 50HRC (Rockwell C scale) – ideal for wear-prone environments
- Machining Tolerance: ±0.05mm (typical) for consistent fit and function
- Surface Finish: Available in polished, matte, or as-machined – customizable upon request
- Certification: Mill Test Report included with each order; ISO9001 factory quality system
- Customization: ODM/OEM accepted – dimensions, shape, and finishing tailored to your drawing
| Parameter | Specification |
|---|---|
| Outer Diameter (OD) | Custom, from 5mm to 300mm |
| Inner Diameter (ID) | Custom, matched to customer requirements |
| Thickness / Height | 1mm – 50mm (customizable) |
| Tensile Strength | ≥520 MPa (typical for 304 at 50HRC) |
| Surface Roughness (Ra) | ≤0.8μm (polished) or as-machined |
Why Choose Our Precision Machined Rings?
- Consistent Hardness: Heat treatment and machining processes are controlled to ensure every ring reaches 50HRC ±2, providing uniform wear resistance.
- Full Traceability: Each ring is marked and shipped with a Mill Test Report, giving you confidence in material quality.
- Cost-Effective: Our large-scale production (51-100 employees, automated CNC machines) reduces per-unit costs without sacrificing quality.
- Fast Lead Times: Located in Dongguan, close to major ports (Shenzhen, Guangzhou), we can ship samples in 7-15 days and mass orders in 20-30 days.
- Global Reach: Exported to North America, Europe, Southeast Asia, Africa, Oceania, and more – we understand international quality and packaging standards.
With an annual export value exceeding US$2.5 million and a dedicated team of 51-100 professionals, Dongguan HonHo Jewelry Co., Ltd. has built a reputation for excellence in precision machining. Our ISO9001-certified quality management system ensures every ring meets stringent specifications. We invite you to experience our commitment to quality, on-time delivery, and customer service. Contact us today to request a quote, discuss your custom design, or order a sample with Mill Test Report.
Frequently Asked Questions (FAQ)
-
Q: Is the 50HRC hardness achievable on all ring sizes?
A: Yes, for most standard sizes up to 300mm OD and 50mm thickness. Very thin rings ( -
Q: Does the Mill Test Report include chemical composition and mechanical data?
A: Absolutely. The report covers %C, %Cr, %Ni, tensile strength, yield strength, and hardness values as per ASTM A276. -
Q: Can I get free samples before placing a bulk order?
A: Yes, we offer sample rings at a nominal cost (refundable with bulk order). Sample lead time is 7-10 working days. -
Q: What surface finishes are available?
A: Standard options include polished (mirror), matte (brushed), and as-machined (turned). Other finishes (black oxide, passivation) are customizable. -
Q: How do you ensure dimensional accuracy for large quantities?
A: We use CNC lathes and grinders with in-process gauging and final inspection with CMM (Coordinate Measuring Machine) for random samples. -
Q: What is your MOQ (Minimum Order Quantity)?
A: MOQ is 100 pieces for standard sizes, lower for custom designs. For regular clients, we can negotiate smaller lots. -
Q: Do you provide packaging suitable for export?
A: Yes, individual rings are wrapped in anti-rust paper, then packed in cartons or wooden crates depending on quantity and destination. -
Q: Can you match specific industry standards (e.g., ASTM, DIN)?
A: Our 304 stainless steel conforms to ASTM A276 and comparable standards. If you require additional certifications, please inform us.
Backed by Dongguan HonHo Jewelry Co., Ltd. – a manufacturer with over a decade of experience, ISO9001 certification, and a global customer base – our Precision Machined 304 Stainless Steel Rings (50HRC) are the reliable choice for your engineering needs. Request your Mill Test Report and quotation today!
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