Product Overview

AISI 420A/420B Stainless Steel Balls are martensitic stainless steel balls engineered for applications that demand a strong balance of hardness, wear resistance, and practical corrosion resistance in everyday media such as water, steam, oil, and petrol. Based on decades of manufacturing expertise and continuous export supply programs, this grade family is widely chosen when stainless performance is needed alongside higher hardness than austenitic grades.

Engineered and tested across thousands of installations in industrial and consumer components, AISI 420A and 420B balls support stable rolling and seating performance in special bearings, automotive safety belt mechanisms, special pumps, and precision accessories such as ballpoint pens and lighters. They are also selected for spare parts programs where consistent dimensional control and repeatable material behavior are essential for assembly yield.

SDBALLS supplies these stainless steel balls with strict process control, OEM and ODM support, and ontime delivery planning. With two factories, modern production equipment, and an export-first model serving customers in more than 50 countries, SDBALLS helps global buyers standardize sourcing across sizes, grades, and documentation requirements.

Physical Property

Item	Value
Corrosion Resistant	Fair
Wear Resistant	Good
Magnetism	Yes

Technical Data

Property	Value
Hardness	HRC 48 – 58
Density	7.73g/m3
Young’s Modulus	195GPa
Tensile Strength	700-800MPa

Chemical Composition

Type	%C	%Si	%Mn	%P	%S	%Cr	%Mo
420A	0.16-0.25	1.00 max	1.50 max	0.040 max	0.030 max	12.00-14.00	–
420B	0.26-0.35	1.00 max	1.50 max	0.040 max	0.030 max	12.00-14.00	–

International Standard

USA	CHN	GER	FRA	UK	ITA	RUS	JAP
420A	2Cr13	1.4021	Z 20 C 13	420 S 37	X20Cr13	20 Kh 13	420J1
420B	3Cr13	1.4028	Z 33 C 13	420 S 45	X30Cr13	30 Kh 13	420J2

Product Images And What They Show

• Product gallery images showing AISI 420A/420B stainless steel balls as finished spherical components with consistent surface appearance for industrial assemblies.
• Page imagery supporting specification-based quotation and B2B inquiry workflows.
• Brand visuals aligned with SDBALLS manufacturing and export positioning.

Key Benefits & Competitive Advantages

• High hardness range of HRC 48 to 58 supports improved wear performance compared with softer stainless options in rolling and contact applications.
• Wide diameter coverage from 0.5mm to 300.00mm supports miniature components through large industrial assemblies and oversized maintenance parts.
• Broad precision grade options from G20 through G1000 support tighter control where needed and cost optimization where suitable.
• Reliable performance in contact with water, steam, oil, and petrol supports versatile usage across industrial mechanisms and consumer components.
• Corrosion resistance described as similar to 420C supports confident selection within martensitic stainless families for comparable environments.
• Magnetic response supports handling, sorting, and automated assembly processes in many production lines.
• OEM and ODM capability supports custom size, grade, and supply program requirements for manufacturers and distributors.
• Export-proven production discipline, strict quality control, and stable delivery planning support repeat orders and long-term supplier consolidation.

Application Scenarios & Use Cases

Scenario	Industry	Key Benefit	Why This Product
Special bearing rolling elements	Bearing and motion systems	Wear resistance and hardness	Martensitic stainless hardness HRC 48 to 58 supports rolling contact performance
Automotive safety belt mechanisms	Automotive safety systems	Stable function and durability	Specifically referenced for automobile safety belt and spare parts applications
Special pump valve elements and check components	Pumps and fluid handling	Media compatibility	Resists contact with water, steam, oil, and petrol for common pump environments
Lighter mechanisms	Consumer hardware	Consistent movement and wear control	Listed application where hardness and repeatability support mechanism reliability
Ballpoint pen writing mechanisms	Stationery and precision consumer parts	Smooth rolling action	Listed application requiring consistent ball geometry and surface behavior
General spare parts programs	Industrial maintenance and MRO	Standardized sourcing	Wide sizes and multiple grades support replacement part standardization
Oil and petrol contact components	Energy and industrial equipment	Practical corrosion performance	Intended to resist contact with oil and petrol in typical service conditions
Semi-precision assemblies requiring magnetism	Industrial assembly	Easier handling and sorting	Magnetism supports automated feeding and inspection processes

Competitive Comparison

Feature/Aspect	This Product	Typical Alternative
Stainless steel family	Martensitic AISI 420A/420B ✓	Austenitic stainless grades focused on corrosion over hardness
Hardness	HRC 48 to 58 ✓	Lower hardness in many corrosion-focused stainless options ✗
Wear resistance	Good ✓	Fair to moderate depending on grade ✗
Corrosion resistance	Fair	Excellent in higher corrosion stainless families ✓
Media compatibility stated	Water, steam, oil, petrol ✓	Often not specified clearly ✗
Magnetism	Yes ✓	Often slight or no magnetism in austenitic grades ✗
Precision grades offered	G20, G40, G80, G100, G200, G500, G1000 ✓	Fewer grade selections or limited availability ✗
Diameter range	0.5mm to 300.00mm ✓	Narrower size coverage in many catalog offerings ✗
Cross-standard equivalency table	Provided ✓	Not always provided ✗
Application fit	Special bearing, automotive safety belt, special pump, lighter, ballpoint pen ✓	More general use positioning without specific match ✗

Technology & Design Highlights

AISI 420A/420B stainless steel balls are built for controlled hardness, wear behavior, and stable dimensional performance across a wide size range.

Martensitic Stainless Performance For Hardness And Wear

AISI 420A and 420B are martensitic stainless steels designed to reach higher hardness than many stainless alternatives. The specified hardness range of HRC 48 to 58 supports rolling contact and repetitive impact or seating cycles in assemblies such as special bearings, pump components, and consumer mechanisms.

Size And Grade Engineering For Fit And Function

The available precision grades from G20 through G1000 allow engineers and procurement teams to align cost and performance with application needs. G20 and G40 support higher precision requirements in motion and seating applications, while G200 to G1000 enable reliable function where ultra-tight tolerance is not required.

Media Compatibility In Common Industrial Fluids

This material is described to resist contact with water, steam, oil, and petrol, which supports selection for many practical industrial and consumer environments. Corrosion resistance is stated as similar to 420C steel, enabling consistent internal material family selection for programs that standardize on 420-series stainless.

Manufacturing Process Discipline That Supports Consistency

SDBALLS manufacturing includes wire drawing, cold forging, flashing, heat treating when required, descaling, hard grinding, lapping, polishing and finishing, and inspecting. This end-to-end process approach supports consistent spherical shape, surface finish, and repeatable performance in customer assemblies.

Industry Compliance & Quality Assurance

Quality assurance is central to predictable performance in stainless steel balls, especially for safety-related and precision-adjacent applications such as automotive safety belt assemblies and special bearings.

Certified Quality Management

SDBALLS is an ISO9002:2000 certified company with strict quality control throughout every manufacturing stage. This supports structured process control, inspection discipline, and repeatable output for international procurement requirements.

Production Capacity And Global Supply Reliability

SDBALLS operates two factories covering 8,000 square meters with more than 200 sets of modern and efficient production equipment and annual production of steel balls of more than 5,000 tons. Products are 100% exported and sold in more than 50 countries, supporting long-term supply programs and distributor replenishment cycles.

OEM And ODM Support For Program Alignment

Flexible OEM and ODM support helps customers match diameter, grade, and documentation needs for production lines, aftermarket programs, and distributor catalogs. On time delivery planning supports stable lead times and reliable shipment execution for global buyers.

Global Reach & Target Markets

SDBALLS is an export-focused steel ball manufacturer with more than 30 years of production experience, serving customers in more than 50 countries with proven case experience across diverse industries. With a track record built on strict manufacturing control, certified quality management, and comprehensive size coverage, SDBALLS supports regional compliance expectations and local industry standards through clear specifications, cross-standard material equivalencies, and consistent product performance.

Target Markets And Localization Fit

Target Region	Customer Types	Industry Focus	Our Advantage
North America	OEM manufacturers, automotive component suppliers, industrial distributors, engineering firms	Automotive safety systems, pumps, bearings, MRO spare parts	Export-proven supply programs, ISO9002:2000 quality control, broad sizes and grades for standardized sourcing
Europe	Precision parts manufacturers, equipment integrators, wholesalers, industrial service providers	Bearings, fluid handling, consumer hardware mechanisms	International standard mapping supports material equivalency and specification alignment across markets
Middle East	Project procurement teams, distributors, industrial maintenance contractors	Oil and petrol contact assemblies, pumps, industrial components	Media compatibility supports common operating fluids and reliable performance in practical service conditions
Southeast Asia	OEM factories, assembly plants, trading companies	Consumer hardware, pumps, semi-precision assemblies	Wide diameter and grade range supports multi-product consolidation and production-line continuity
South America	Distributors, MRO suppliers, manufacturers	Spare parts programs, industrial equipment components	Stable export delivery planning and flexible OEM and ODM support for local catalog and replacement needs

Customer Success & Experience

Based on more than 30 years of production experience and a 100% export business model, SDBALLS has extensive hands-on experience supplying AISI 420A/420B stainless steel balls for customers who prioritize hardness, wear resistance, and dependable performance in common industrial media. Engineered and tested across thousands of installations and long-running replenishment programs, these balls are frequently selected for assemblies where consistent rolling, seating, and durability directly influence product reliability.

Typical successful programs include an automotive parts supplier supporting safety belt mechanisms that require stable material behavior and consistent batch-to-batch performance, a pump and fluid equipment manufacturer needing stainless ball elements compatible with water, steam, and petroleum-based fluids, and a consumer hardware producer using balls in lighters and ballpoint pen mechanisms where surface consistency and hardness affect long-term function.

SDBALLS supports customers with specification confirmation, grade selection, OEM and ODM customization, and responsive quotation service for ongoing procurement. Many buyers progress from qualification orders to repeat supply across multiple sizes and grades, reflecting consistent quality control, scalable capacity, and dependable export logistics.

FAQ

Q: What is the difference between AISI 420A and 420B stainless steel balls?

A: Both are martensitic stainless steel ball materials with similar chromium range and strong hardness capability. The chemical composition table shows different carbon ranges for 420A and 420B, supporting different hardness and performance targeting within the same stainless family.

Q: What sizes can you supply for AISI 420A/420B stainless steel balls?

A: The diameter range is 0.5mm to 300.00mm. This wide size coverage supports miniature mechanisms through large industrial assemblies.

Q: What precision grades are available for this product?

A: Precision grades include G20, G40, G80, G100, G200, G500, and G1000. This range allows selection based on functional requirements and cost optimization.

Q: What hardness range do these stainless steel balls provide?

A: The hardness range is HRC 48 to 58. This supports good wear resistance and durability for rolling contact and repetitive seating applications.

Q: What are typical applications for AISI 420A/420B stainless steel balls?

A: Typical applications include special bearings, automobile safety belt mechanisms, spare parts, special pumps, lighters, and ballpoint pens. They are positioned for uses where hardness and wear performance are important.

Q: How is the corrosion resistance described for AISI 420A/420B balls?

A: Corrosion resistance is rated as fair in the physical property table. The product text states that 420A and 420B steels offer corrosion resistance similar to 420C steel and that these balls resist contact with water, steam, oil, and petrol.

Q: Are AISI 420A/420B stainless steel balls magnetic?

A: Yes, magnetism is listed as yes. This can support automated handling and sorting in many production environments.

Q: Can SDBALLS support OEM and global supply programs for this product?

A: Yes, SDBALLS provides OEM and ODM support, strict process control, and ontime delivery planning. The company operates two factories with modern equipment, is ISO9002:2000 certified, and exports products to more than 50 countries.