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Stainless Steel Balls

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AISI 440 / 440C Stainless Steel Balls

International Equivalent:
Equivalent grades include SUS440 / SUS440C, EN 1.4112 (440) / 1.4125 (440C) and 9Cr18 (440) / 9Cr18Mo (440C).
AISI 440 and 440C stainless steel balls are high-carbon martensitic stainless steels that can be hardened to achieve excellent wear resistance and high load capacity. 440C provides higher hardness and is widely used in precision bearing and high-performance applications.
Martensitic Stainless
Through-Hardened & Tempered
High Hardness
Bearing-Grade Performance
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Product information:

Detailed Description

Also known as bearing-grade stainless steel balls, 440 and 440C are used in applications requiring high hardness, wear resistance and moderate corrosion resistance.

AISI 440 / 440C Stainless Steel Balls

AISI 440 and 440C stainless steel balls are manufactured from high-carbon martensitic stainless steel and can be heat treated to achieve high hardness and wear resistance.
Compared with 420 stainless steel, 440C offers improved wear resistance, fatigue strength and load capacity, making it suitable for precision bearings and high-performance mechanical systems.

Technical Specifications

Item	Specification
Material	AISI 440 / 440C
Equivalent Materials	440: SUS440 / 9Cr18 / EN 1.4112; 440C: SUS440C / 9Cr18Mo / EN 1.4125
Size Range	0.5 mm – 200 mm
Hardness (Hardened & Tempered)	440: 55–60 HRC / 440C: 58–66 HRC
Grade	G10 – G1000
Density	7.75 g/cm³
Standard	ISO 3290
Heat Treatment	Through-hardened and tempered
Corrosion Resistance	Moderate corrosion resistance for hardened martensitic stainless steel; lower than 304 / 316
Packing	Carton / Steel drum / Bulk bag / Custom
Condition	Hardened, cleaned and oiled
Delivery Time	Stock available for standard sizes or 30–35 days for production

Chemical Composition

Grade	C (%)	Si (%)	Mn (%)	Cr (%)	Mo (%)	P (%)	S (%)
440	0.90–1.00	≤0.80	≤0.80	17.00–19.00	—	≤0.035	≤0.030
440C	0.95–1.20	≤1.00	≤1.00	16.00–18.00	≤0.75	≤0.040	≤0.030

Note: Typical chemical composition ranges. Minor variations may exist among different international standards.

Applications

Ball Bearings

Precision Mechanical Systems

Aerospace & Industrial Equipment

Wear-Critical Components

FAQ

What information do you need for a quotation?

Please provide ball size, material grade (440 or 440C), quantity, grade requirement, application and delivery terms.

What is the difference between 440 and 440C stainless steel balls?

440C has higher carbon content and molybdenum addition, enabling higher hardness, better wear resistance and improved fatigue performance compared to standard 440.

Are 440C stainless steel balls suitable for bearing applications?

Yes, 440C stainless steel balls are widely used in precision bearing applications due to their high hardness, wear resistance and good fatigue strength.

How does 440C compare to chrome steel balls?

440C provides comparable hardness and wear resistance, with the added benefit of corrosion resistance. However, chrome steel may offer better fatigue performance under extreme high-speed or heavy-load conditions.

Are 440C stainless steel balls corrosion resistant?

Yes, they provide moderate corrosion resistance, although lower than austenitic stainless steels such as 304 or 316.

Can 440 or 440C balls be used in bearing applications?

440C stainless steel balls are widely used in bearing applications where high hardness and wear resistance are required. Compared with chrome steel, they offer better corrosion resistance, although fatigue performance may be slightly lower under extreme operating conditions. Material selection should be based on the specific application.

Can you provide high precision grades?

Yes, grades from G10 to G1000 are available depending on size and application requirements.

Can you support custom sizes or specifications?

Yes, custom sizes, grades, heat treatment and packaging are available. MOQ depends on specifications.

Can you provide samples for testing?

Yes, samples are available. Standard sizes are usually available from stock.

Do you provide inspection reports or certificates?

Yes, inspection reports include hardness, dimensions and tolerance. Material certificates are available upon request.

What packaging options do you offer?

Cartons, steel drums, bulk bags and customized packaging are available.

Standard packing: