AMS 6440 AISI 52100 Bearing Steel

AMS 6440 52100 bearing steel offers 58–64 HRC hardness, excellent wear resistance, and superior rolling contact fatigue strength. Ideal for aircraft bearings, automotive components, gears, and cutting tools. VAR/ESR grades available. ZYTC Alloy is AS9120B and ISO 9001 certified.

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AMS 6440 AISI 52100 is the most widely used high‑carbon chromium bearing steel, specified for high‑load, high‑fatigue mechanical and aerospace systems. As a professional Chinese bearing steel supplier, ZYTC Alloy provides fully compliant AMS 6440 52100 products including round bars, forgings, forging stock and mechanical tubing, serving commercial aviation, military aerospace and precision machinery industries with stable quality and full specification support.

AISI 52100 Chemical Composition (WT %)

	C	Mn	Si	P	S	Cr	Ni	Mo	Cu	Al	O
Min	0.93	0.25	0.15	–	–	1.35	–	–	–	–	–
Max	1.05	0.45	0.35	0.015	0.015	1.60	0.25	0.1	0.3	0.05	0.015

Material Overview & Standard Definition

AMS 6440 is the aerospace industry specification covering low‑alloy high‑carbon chromium bearing steel supplied in bar, forging and mechanical tubing forms. With a controlled chemical composition of 0.93–1.05% Carbon and 1.45% Chromium, AISI 52100 features deep hardening capability, extreme surface hardness and outstanding rolling contact fatigue resistance. The material is also known as Var‑Arc / LESCALLOY® grade, manufactured with refined melting processes to achieve ultra‑clean microstructure and consistent fatigue performance.

52100 bearing steel is designed for continuous rolling friction and high‑stress cyclic loading. It maintains excellent mechanical stability at operating temperatures below 400°F (204°C), making it the standard material for aircraft anti‑friction bearings and heavy‑duty precision mechanical components.

Core Mechanical & Physical Properties

Ultra‑High Hardness & Wear Resistance: After heat treatment, 52100 reaches HRC 60–67, delivering exceptional abrasion resistance and surface load capacity, effectively resisting surface spalling and wear failure.
Superior Rolling Contact Fatigue Strength: The refined carbide distribution and uniform martensitic structure support long‑life cyclic rolling operation, the core advantage for bearing service life.
Deep Hardening Performance: Excellent full‑section hardening ability ensures uniform hardness from surface to core, avoiding local soft zones under heavy load.
Magnetic & Stable Mechanical Response: Naturally magnetic; optimized heat conditioning greatly improves pressure resistance and tensile stability under static and dynamic loads.
Good Machinability After Tempering: Softer tempered state allows precise turning, grinding and finishing, easier to machine than many high‑hard alloy steels while retaining final high‑hardness performance after secondary heat treatment.

Available Product Forms

ZYTC Alloy supplies full‑series AMS 6440 52100 bearing steel semi‑finished and finished materials to meet diverse processing needs:

Round Bars & Flat Bars
Forgings & Forging Stock
Mechanical Tubing

All products adopt strict dimensional tolerance control, surface defect inspection and metallurgical consistency testing to meet aerospace batch stability requirements.

Cross Reference Specifications

AMS 6440 52100 bearing steel is fully compatible with mainstream global industry standards, supporting multi‑standard certification for engineering procurement:

AMS 2301, AMS 6444
ASTM A295, ASTM A331

Applications

Thanks to its unmatched rolling fatigue resistance and wear resistance, AMS 6440 52100 is irreplaceable in high‑reliability motion system components:

Aerospace Industry: Commercial and military aircraft anti‑friction bearings, aviation high‑stress rotating parts, engine auxiliary motion components
Precision Machinery: High‑speed bearings, bearing rollers, races, shafts and bushing components
High‑Load Mechanical Systems: Cyclic friction parts requiring long service life and high dimensional stability

ZYTC Alloy Supply Advantages

As a reliable Chinese manufacturer specializing in aerospace‑grade bearing steel, ZYTC Alloy strictly implements AMS 6440 standard production processes. We adopt refined melting technology to reduce inclusions and ensure ultra‑clean grain structure, effectively improving material fatigue life and batch consistency.

We provide standardized heat treatment solutions, precise cutting service and complete material test reports (MTR). Whether for small‑batch aerospace customized parts or large‑scale mechanical supporting bulk orders, ZYTC Alloy can deliver stable, high‑quality AISI 52100 bearing steel products with strict quality traceability.

Contact Us

Contact ZYTC Alloy to obtain AMS 6440 52100 official datasheets, batch inspection reports and competitive wholesale pricing.

📧 Email: daisy@zytcsteel.com
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