BC Precision 5/16" 440 Stainless Steel Bearing Balls G25, 50 Pack
- Standard Diameter: 5/16" / .3125 InchesMetric Diameter: 7.9375mmGrade: 100Material: 440 Stainless SteelBall Weight (each): .072065 Ounces / 2.043 Grams440 stainless steel balls offer the precise geometry and fine surface finish that makes them especially useful for bicycles, casters, drawer slides, door locks and many other applications with the added benefit of corrosion resistance. 440 stainless steel is a high carbon martensitic stainless steel which has high strength, good hardness and wear
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Select a product to estimate shipping.How hard are they?
Through-hardened to approximately 58-62 HRC, the highest hardness available in any stainless steel. That is why 440C is the standard material for stainless bearing balls, valve components, and grinding media.
What does G100 mean?
G100 is a precision grade under ABMA Standard 10. Diameter variation and out-of-roundness are held within 0.0001 inch, with an 8 microinch finish. Lower numbers mean tighter tolerance. G100 suits larger balls.
What standard is 440C?
440C is an AISI/SAE material designation, formally UNS S44004, specified in ASTM A276 and AMS 5630. Ball grade is a separate standard: ABMA Std 10 in the US, ISO 3290 internationally.
Will these rust?
440C resists rust far better than chrome or carbon steel. Its 16-18% chromium handles humidity, fresh water, and washdown. It is not as corrosion resistant as 304 or 316, so for constant saltwater immersion choose 316 instead.
How is 440C different from 440A or 440B?
Carbon content. 440A runs 0.65-0.75%, 440B 0.75-0.95%, 440C 0.95-1.20%. More carbon means higher hardness and better wear resistance, with a small tradeoff in corrosion resistance. 440C is the standard for precision balls.
Product details
Specifications
| Main Specification | |
|---|---|
| Manufacturer | BC Precision |
| Unit Count | 50 Count |
| Specification Met | G100 |
| Outside Diameter | 0.31 inches |
| Brand | BC Precision |
| UPC | 730860461528 |
| Number of Items | 50 |
| Bearing Type | Ball Bearing |
| Compatible Lubricant | Grease |
| Material | Alloy Steel |
| Global Trade Identification Number | 00730860461528 |
| Item Weight | 2.04 g |
| Technical Details | |
|---|---|
| Part Number | BC516SS-50 |
| Model | 516BCSS8 |
| Material Type | Alloy Steel |
| Others | |
|---|---|
| Item Highlight | Casters, Corrosion-Resistant Precision Balls for Bearings, Drawer Slides and Door Locks |
| Product Type | Precision Balls |
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