This specification covers a premium aircraft-quality, high-alloy tool steel in the form of bars, wire, forgings, and forging stock. These products have been used typically for critical parts, such as bearings operating under heavy loads and high speeds at moderate temperatures and subject to very rigid inspection standards, but usage is not limited to such applications.
SAE AMS6557 History
SAE AMS6557A
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SAE AMS6557
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