Introduction to Stainless Steel Bearings

Stainless steel bearings have become essential components in industries where corrosion resistance, hygiene, and durability are critical. As a leading stainless steel bearings manufacturer with over 20 years of experience, SINO BEARINGS (KMK brand) produces both 630 and 17-4PH grades to meet diverse industrial requirements.

Understanding 630 Stainless Steel Bearings

The 630 grade (also known as AISI 630 or 17-4 precipitation-hardened stainless steel) is one of the most widely used stainless steels for bearing applications. Key properties include:

• Corrosion resistance: Excellent resistance to atmospheric corrosion, fresh water, and mild chemical environments
• Hardness: Achieves HRC 40-47 after precipitation hardening, providing good wear resistance
• Load capacity: Higher load capacity than standard 304/316 stainless steels
• Temperature range: Stable performance from -60°C to +300°C

17-4PH Stainless Steel Bearings

17-4PH (precipitation-hardening) stainless steel offers an exceptional balance of strength and corrosion resistance:

• Higher hardness: Reaches HRC 42-48, approaching chrome steel bearing levels
• Superior corrosion resistance: Outperforms 440C in most corrosive environments
• High yield strength: Up to 1,000 MPa, ideal for high-load applications
• Dimensional stability: Low distortion during heat treatment

Key Differences: 630 vs 17-4PH

Choosing the Right Grade

For food processing and marine applications, 630 stainless steel bearings offer excellent value with strong corrosion resistance at a competitive price point. For aerospace, chemical processing, and high-load precision applications, 17-4PH provides the ultimate combination of strength and corrosion protection.

Why Choose SINO BEARINGS?

As a specialized stainless steel bearings manufacturer in Chengdu, China, SINO BEARINGS offers:

• 20+ years of precision bearing manufacturing experience
• Full in-house heat treatment for 630 and 17-4PH grades
• Custom bearing design and manufacturing capabilities
• Complete quality control with ISO-compliant testing
• Competitive pricing with worldwide shipping

Contact us at kevin@sinoti.com to discuss your stainless steel bearing requirements, or visit our product catalog for standard sizes.

SINO BEARINGS (KMK) - Perfect Quality -- Great Service -- Customized. Stainless steel bearing manufacturer since 2004.

Source: SINO BEARINGS