AMS 5643 steel round bar, also known as 17-4 PH stainless steel (UNS S17400), is a precipitation-hardening stainless steel used in aerospace, defense, industrial manufacturing, and precision machining applications.
At Mozaic Precision Metals, we supply and process 17-4 PH round bar for manufacturers requiring specified material conditions, controlled diameters, surface finishes, and material documentation.
Our ISO 9001:2015-certified operation provides centerless grinding, bar straightening, polishing, saw cutting, and custom bar processing.
What Is AMS 5643 Steel?
AMS 5643 is an SAE aerospace material specification covering precipitation-hardenable 17-4 PH corrosion-resistant steel in product forms including bars, wire, forgings, tubing, and rings.
The material is identified as UNS S17400, a chromium-nickel-copper stainless steel capable of developing high strength through precipitation-hardening heat treatment.
Key characteristics include:
High Strength: Can develop high tensile and yield strength after appropriate aging.
Corrosion Resistance: Offers corrosion resistance suitable for numerous industrial environments.
Machinability: Can be machined in the solution-treated condition, with properties and cutting behavior dependent on condition.
Heat Treatment Flexibility: Supports different combinations of strength, hardness, and toughness through specified aging treatments.
Precision Processing: Round bar can be centerless ground to meet customer-defined dimensional and surface finish requirements.
Material compliance depends on the applicable specification revision, supplied condition, testing, and certification documentation.
AMS 5643 Specifications and Material Requirements
When purchasing AMS 5643 round bar, manufacturers should identify the applicable specification revision and required product condition.
| Material characteristic | Description |
|---|---|
| Material specification | SAE AMS 5643 |
| Stainless steel grade | 17-4 PH |
| UNS designation | S17400 |
| Alloy family | Precipitation-hardening stainless steel |
| Principal alloying elements | Chromium, nickel, copper, and niobium |
| Common supply condition | Solution heat treated (Condition A) |
| Additional processing | Aging, machining, grinding, straightening, and polishing as specified |
| Documentation | Mill test reports and applicable processing certifications, as required |
For aerospace and other specification-controlled applications, the material’s chemical composition, condition, product form, mechanical properties, and inspection requirements must satisfy the applicable purchase specification.
AMS 5643 Chemical Composition
17-4 PH stainless steel contains chromium, nickel, copper, and niobium, which contribute to its corrosion resistance and precipitation-hardening behavior.
The nominal composition is approximately 17% chromium and 4% nickel, with copper and niobium additions.
Exact chemical limits must be verified against the applicable AMS 5643 revision and the supplied mill test report.
Why Chemical Composition Matters
Chemical composition influences corrosion behavior, mechanical properties, response to heat treatment, and suitability for manufacturing applications.
For specification-controlled work, material certification and traceability are particularly important.
AMS 5643 Heat Treatment Conditions
AMS 5643 material is commonly supplied in the solution heat-treated condition, known as Condition A. Subsequent precipitation-hardening treatments may be specified to obtain different mechanical properties.
Common 17-4 PH conditions include:
Condition A: Solution heat-treated material prior to aging.
H900: Higher strength and hardness.
H925: High strength with properties dependent on the applicable specification.
H1025: Balance of strength and toughness.
H1075: Intermediate aged condition.
H1100: Lower strength and greater ductility than peak-aged conditions.
H1150: Commonly used where improved toughness and ductility are desired.
Not every supply condition is interchangeable. Material certification and processing requirements should be reviewed before ordering.
For a detailed comparison of treatment temperatures, mechanical properties, and available conditions, visit our 17-4 Heat Treated Stainless Steel Guide.
Precision Ground AMS 5643 Round Bar
Manufacturers using AMS 5643 stainless steel frequently require controlled outside diameters, consistent surface finishes, and dependable straightness for their machining operations.
Mozaic Precision Metals offers precision bar processing services, including:
Centerless Grinding
Our centerless grinding services help achieve customer-specified outside diameters, dimensional tolerances, and surface finishes.
Bar Straightening
We offer metal straightening services for round bars requiring straightness control before machining or further processing.
Polishing and Surface Finishing
Surface finishing can be specified to meet application requirements for appearance, surface roughness, and subsequent manufacturing operations.
Saw Cutting and Custom Lengths
Round bars can be cut to specified lengths for production, machining, and material preparation.
Available processing depends on the starting dimensions, material condition, and required final specifications.
Applications of AMS 5643 Stainless Steel Round Bar
17-4 PH stainless steel is used across industries requiring combinations of mechanical strength, corrosion resistance, and dimensional precision.
Aerospace and Defense
Precision shafts and pins
Aerospace fasteners
Actuator components
Structural and mechanical fittings
Industrial Manufacturing
Pump and valve components
Mechanical shafts
Couplings and fittings
Precision-machined equipment components
Oil, Gas, and Energy
Selected valve components
Industrial shafts
Equipment fittings
High-strength machined components
Suitability for a specific component depends on the material condition, environment, engineering requirements, and applicable specifications.
Why Choose Mozaic Precision Metals for AMS 5643 Steel?
Mozaic Precision Metals combines bar supply with precision metal processing capabilities.
Our services support manufacturers requiring:
AMS 5643 material sourcing based on specified requirements
Precision centerless grinding
Custom outside diameters and surface finishes
Bar straightening and polishing
Custom cutting and packaging
ISO 9001:2015-certified quality management processes
Review of applicable material documentation and traceability requirements
Our team works with manufacturers requiring both standard material supply and additional precision processing before production.
Request a Quote for AMS 5643 Steel Round Bar
Looking for an AMS 5643 steel round bar supplier with precision grinding and custom processing capabilities?
Contact Mozaic Precision Metals for a quotation tailored to your material and manufacturing requirements.
For accurate pricing, please provide:
Required specification and revision
Material condition, such as Condition A or a specified aged condition
Starting and finished outside diameter
Bar length and quantity
Diameter tolerance and straightness requirements
Surface finish requirements
Required material certifications
Delivery location and requested date