Waspaloy CR® Round Bar - Cold-Reduced - AMS 5708

Waspaloy CR® round bar, cold‑reduced and produced to AMS 5708, is a high‑strength nickel‑based alloy containing chromium and cobalt, commonly used for aircraft fasteners and aerospace hardware. Type 1 material is capable of meeting AMS 5709 requirements, supporting applications that demand exceptional strength at elevated temperatures. Waspaloy CR® maintains mechanical strength up to 1500°F (816°C) and provides oxidation resistance to approximately 1750°F (954°C).

The alloy is multiple‑melted to ensure high cleanliness and consistency, typically using Vacuum Induction Melting (VIM) followed by Vacuum Arc Remelting (VAR) or VIM followed by Electroslag Remelting (ESR). In the annealed, cold‑worked, and ground condition, Waspaloy CR® round bar is supplied with a maximum hardness of 44 HRC, making it well suited for precision fastener manufacturing.

Inventory Size Ranges for Waspaloy CR®

Type	Thickness	AMS Standards	UNS	Get a Quote
Bar	0.260" - 0.4475"	AMS 5708 Type 1, AMS 5709 (Capable of)	UNS NO7002	Get a Quote

Characteristics of Waspaloy CR®

Waspaloy CR® offers a combination of high strength, fatigue resistance, and thermal stability for demanding aerospace environments. Its nickel‑based chemistry, strengthened with chromium and cobalt, provides excellent resistance to oxidation and creep under prolonged high‑temperature exposure. Cold reduction further enhances mechanical properties, making the alloy reliable in critical load‑bearing applications.

The multi‑melt processing route produces a clean, uniform microstructure that supports consistent performance and fatigue resistance. These characteristics make Waspaloy CR® a preferred material where components are exposed to sustained heat, stress, and cyclic loading.

Working with Waspaloy CR®

Waspaloy CR® is a high‑strength superalloy and should be processed using appropriate machining practices. Due to its strength and tendency to work harden, machining requires rigid equipment, sharp tooling, controlled cutting speeds, and adequate cooling to maintain tool life and surface finish.

The alloy is primarily used in mechanically fastened components, with fabrication and heat treatment performed in accordance with applicable AMS specifications. Welding is limited and generally avoided in fastener applications. When properly processed, Waspaloy CR® delivers reliable performance in high‑temperature aerospace service.

Other industry standards we comply with:

PWA LCS
GE Aircraft Engine (GT193)
GE Aviation S-SPEC-35 AeDMS S-400
RR SABRe Edition 2
DFARS Compliant
Fairchild MS305
EN 2.4654

Common Trade Names

Waspaloy®

Industry Applications for Waspaloy CR®

Aerospace Fasteners
Aircraft Engine Components
High-Temperature Systems

Chemical Composition

Chemical Composition Percentage of Waspaloy CR®
	Element	Min	Max
C	Carbon	0.02	0.10
Mn	Manganese	-	0.10
Si	Silicon	-	0.15
P	Phosphorus	-	0.015
S	Sulfur	-	0.015
Cr	Chromium	18.00	21.00
Co	Cobalt	12.00	15.00
Mo	Molybdenum	3.50	5.00
Ti	Titanium	2.75	3.25
Al	Aluminum	1.20	1.60

Physical Properties

Property	Value
Density	0.296 lb/in³(8.19 g/cm³)

Datasheet

Download our Waspaloy CR® datasheet

Additional Info

A Brief History of Waspaloy CR®

Waspaloy CR® is a high‑strength, nickel‑based superalloy developed specifically for high‑temperature aerospace fastener and hardware applications. Derived from the broader Waspaloy alloy family, Waspaloy CR® was engineered to deliver exceptional strength, fatigue resistance, and oxidation resistance under prolonged exposure to elevated temperatures. Its cold‑reduced form provides the mechanical performance required for critical aircraft and engine hardware where reliability is paramount.

Originally developed to meet the increasing performance demands of modern aircraft systems, Waspaloy CR® supports operating temperatures that exceed the capabilities of stainless steels and many conventional nickel alloys, making it a trusted material for aerospace environments.

How Waspaloy CR® Was Developed

Waspaloy CR® was developed to address the need for higher strength fastener materials capable of maintaining mechanical integrity at elevated temperatures. Metallurgists optimized the nickel‑based chemistry with additions of chromium and cobalt to enhance oxidation resistance, high‑temperature strength, and creep resistance. Cold‑reduction processing further increases tensile and fatigue strength, producing material well suited for precision fasteners and aerospace hardware.

To ensure consistency, cleanliness, and fatigue performance, Waspaloy CR® round bar is multiple‑melted, typically using Vacuum Induction Melting (VIM) followed by Vacuum Arc Remelting (VAR) or VIM followed by Electroslag Remelting (ESR). These refining processes reduce segregation and non‑metallic inclusions, supporting the stringent quality standards required in aerospace applications.

Early Applications of Waspaloy CR®

As jet engines and airframes evolved to operate at higher temperatures, Waspaloy CR® quickly became established as a material of choice for aircraft fasteners and high‑strength attachment hardware. Its ability to retain strength up to 1500°F (816°C) and resist oxidation to approximately 1750°F (954°C) made it ideal for use in engine‑adjacent and high‑stress locations where thermal exposure and cyclic loading are common.

Early use of Waspaloy CR® focused on bolts, studs, screws, and precision round bar components, supporting both commercial and military aerospace platforms.

How Waspaloy CR® Is Used Today

Today, Waspaloy CR® remains a critical material for aerospace and defense applications requiring high strength, fatigue resistance, and thermal stability. It is most commonly used in aircraft fasteners, engine hardware, retaining rings, pins, and structural attachment components manufactured to AMS specifications such as AMS 5708, with Type 1 material capable of meeting AMS 5709 requirements.

Waspaloy CR® is typically supplied in the annealed, cold‑worked, and ground condition, with a maximum hardness of 44 HRC, providing a balance of strength and manufacturability for precision aerospace components. Its continued use reflects its proven performance in demanding, high‑temperature service environments where component failure is not an option.

Your Trusted Supplier for Waspaloy CR®

United Performance Metals is a global specialty metals solutions provider offering Waspaloy CR® round bar for aerospace fastener and high‑temperature hardware applications. With advanced FIRSTCUT+® processing services and extensive experience serving the aerospace and defense industries, UPM delivers high‑performance materials cut to exact specifications and supported by reliable supply chain solutions.

Contact our team today to learn how Waspaloy CR® round bar can support your next high‑temperature aerospace application.

Product FAQs

Waspaloy CR® is a cold‑reduced, nickel‑based superalloy containing chromium and cobalt, developed for high‑strength aerospace fastener and hardware applications. It is supplied in round bar form and produced to AMS 5708, with Type 1 material capable of meeting AMS 5709 requirements.

Waspaloy CR® is specifically processed through cold reduction to increase tensile strength and fatigue resistance, making it ideal for fasteners and precision hardware. Standard Waspaloy is more commonly used for larger forged or machined components, while the CR® form is optimized for high‑strength bar stock applications.

Waspaloy CR® is primarily used in the aerospace and defense industries, particularly for aircraft fasteners, engine‑adjacent hardware, and high‑strength attachment components that must perform reliably in high‑temperature environments.

Common applications include bolts, screws, studs, pins, retaining rings, and precision aerospace hardware. These components are often used in aircraft engines, airframes, and structural assemblies where high strength and fatigue resistance are required.