HARDENED MARTENSITIC STAINLESS STEEL

AISI 420A/420B Stainless Steel Balls

Cost-effective hardened stainless steel balls balancing wear resistance, magnetic handling and practical corrosion performance for pumps, mechanisms and industrial assemblies.

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AISI 420A/420B Stainless Steel Balls supplied by SDBALLS — PRODUCT REFERENCE / FINAL SPECIFICATION BY QUOTATION

PRODUCT OVERVIEW

What are aisi 420a/420b stainless steel balls?

AISI 420A and 420B balls are martensitic stainless steel spheres heat treated for higher hardness and wear resistance than common 300-series austenitic stainless balls. Their chromium-bearing structure provides practical corrosion resistance in many mild industrial environments.

420A and 420B differ mainly in carbon range and resulting heat-treatment response. Final selection should follow the exact grade, hardness, diameter, precision, surface finish and operating medium stated on the purchase specification.

TECHNICAL SPECIFICATIONS

Start with measurable requirements.

Values below are product-family references. The quotation, drawing, agreed standard and inspection plan control the final supply specification.

Technical itemReference specification

Material420A / 2Cr13 / 1.4021 or 420B / 3Cr13 / 1.4028 as specified

Diameter Range0.5–300 mm; grade and precision availability subject to confirmation

Precision GradeG20, G40, G80, G100, G200, G500 and G1000 typical

ToleranceControlled by the agreed precision grade, drawing or purchase specification

HardnessHRC 48–58 typical after heat treatment

DensityApprox. 7.73 g/cm³

Surface FinishGround, polished, passivated, clean/dry or lightly protected

Roundness / SphericityControlled according to the agreed precision grade and inspection method

Temperature ResistanceApplication, load, atmosphere and material-grade dependent

Chemical ResistanceFair to good in mild media; verify water, steam, oil, fuel and cleaning chemistry

PackagingBulk, small-quantity, container, bag, carton, export pallet or customized packing

MagnetismMagnetic

PRODUCT SELECTION GUIDANCE

Compare materials before substituting.

Material selection affects load, wear, corrosion, temperature, precision, service life and total program cost.

Material optionPrimary advantageLimitationBest fit

420A/420B stainlessBalanced hardness, wear and costNot for aggressive chloride or acid exposurePumps, mechanisms, lighters and general industrial parts

420C stainlessHigher carbon and stronger wear performanceSimilar corrosion limits and higher costValves, bearings and harder contact

440C stainlessHighest common stainless bearing-ball hardnessPremium cost and only moderate corrosion resistancePrecision bearings and wear-critical assemblies

304 / 316 stainlessStronger general corrosion resistanceMuch lower hardnessFood, marine, chemical and hygienic systems

KEY PERFORMANCE FEATURES

Performance that purchasing teams can verify.

Hardened martensitic structure

Heat treatment develops useful hardness for repetitive seating, rolling and mechanical contact.

Practical stainless performance

Offers better mild-environment corrosion behavior than standard carbon and chrome steel.

Magnetic automation

Magnetic response supports feeding, sorting and assembly-line handling.

Broad grade selection

Multiple ball grades let buyers balance functional precision and program cost.

TYPICAL APPLICATIONS

Specify the work the ball must perform.

Application names are starting points—not approval of universal suitability. Share the real medium, load, speed, pressure, temperature, life target and compliance needs.

Special bearings & mechanisms

Moderate-load rolling elements, detents and mechanisms where high bearing-grade fatigue life is not the primary requirement.

Pumps & fluid control

Checking and seating components for compatible water, steam, oil and fuel service.

Automotive safety mechanisms

Seat-belt, latch and repetitive-contact components requiring controlled hardness.

Consumer & precision hardware

Lighters, ballpoint pens, instruments and durable mechanical assemblies.

Typical applications for AISI 420A/420B Stainless Steel Balls — REPRESENTATIVE APPLICATION ENVIRONMENTS

QUALITY & DOCUMENTATION

Build the evidence into the purchase order.

Document requirements should be defined before quotation so the inspection method, sampling level, traceability and external testing can be planned correctly.

Material verification against the agreed steel grade and purchase specification
Diameter, tolerance and precision-grade inspection using calibrated equipment
Hardness and heat-treatment verification when applicable
Surface finish and visual-defect inspection to the agreed acceptance criteria
Roundness / sphericity and lot-consistency inspection for the specified precision level
Batch traceability through heat, lot and controlled production records
Material certificates and inspection reports available when agreed before quotation
RoHS, REACH, PPAP-style records and third-party testing by project agreement

PACKAGING OPTIONS

Protect precision through delivery.

Final packing depends on material, diameter, surface sensitivity, order weight, storage time and destination.

Small-quantity packing

Size-separated bags, bottles, trays or protected containers for samples, repair and qualification lots.

Bulk industrial packing

Inner bags, cartons, pails or steel drums selected around diameter, total weight and handling method.

Surface protection

Clean/dry, passivated, lightly oiled or rust-preventive packing according to alloy and storage risk.

OEM & export packing

Customer labels, counted packs, batch separation, export pallets and line-ready packaging by agreement.

Supported formats: bulk packaging · small-quantity packaging · plastic containers · bags · cartons · export pallets · customized packaging.

SMALL QUANTITY & SAMPLE ORDERS

Validate before you scale.

SDBALLS Industry Corp. supports North American customers with sample quantities, prototype requirements, testing programs and specialty ball inquiries.

For sample review, send the exact 420A or 420B designation, diameter, grade, hardness, medium, quantity and required inspection documents.

PrototypeTestingRepairR&DSmall batch production

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PRODUCT FAQ

Answers for engineering and purchasing teams.

What sizes are available?

The reference manufacturing range is 0.5–300 mm. Actual availability depends on exact alloy, precision grade, heat treatment, quantity and inspection requirements.

What precision grades can be supplied?

Typical grades include G20 through G1000. The practical grade depends on diameter, hardness condition, surface finish and application.

How corrosion resistant is this material?

420A/420B provides practical resistance in many mild environments but is not the first choice for seawater, chloride-rich media or strong acids. Verify the exact fluid and temperature.

Are these steel balls magnetic?

Yes. 420A and 420B are martensitic stainless steels and are magnetic.

Can SDBALLS provide material certificates and inspection reports?

Yes. Define the required material certificate, dimensional report, hardness report, compliance record, PPAP-style documentation or third-party test before quotation so the correct inspection plan can be priced.

Do you support samples and small-quantity orders?

Yes. SDBALLS Industry Corp. supports North American buyers with samples, prototype quantities, repair lots and small-batch programs where the requested size, grade and material condition are available.

CONTACT SDBALLS U.S.

Bring us the application and requirement.

Include product, material, size or shot size, grade, hardness, finish, quantity, packaging, application and required documentation for a faster quotation.

SDBALLS Industry Corp.Email: info@sdballs.usWhatsApp: +1 424 351 5470Website: www.sdballs.usNorth American Business Support