17-4 PH stainless steel round bar to AMS 5643 is one of the most widely used precipitation-hardening stainless steels in industries that demand high strength, corrosion resistance, and tight tolerances.
This grade is commonly used in medical, aerospace, and precision machining applications, especially where parts must maintain dimensional stability after heat treatment.
What is 17-4 PH AMS 5643?
17-4 PH (UNS S17400) is a chromium-nickel-copper precipitation-hardening stainless steel designed to deliver:
- High strength after heat treatment
- Excellent corrosion resistance
- Good machinability in the solution-annealed condition
- Minimal distortion during aging
The AMS 5643 specification ensures the material meets strict aerospace-grade requirements for chemistry, mechanical properties, and processing.
17-4PH Available Heat Treatment Conditions
17-4 PH is typically supplied in Condition A (annealed) and then heat treated to specific strength levels:
- H900 – Maximum strength and hardness
- H1025 – Balanced strength and toughness
- H1150 – Improved ductility and corrosion resistance
For Swiss machining and tight tolerance grinding, many customers prefer starting in Condition A and heat treating after machining.
Why 17-4 PH is Ideal for Centerless Grinding
17-4 PH AMS 5643 round bar is widely used for centerless ground (CG) and precision ground (PG) bar applications because:
- It holds tight tolerances after grinding
- It responds predictably to heat treatment
- It provides excellent surface finishes (including 32 micro and finer)
- It maintains straightness over long bar lengths
This makes it a top choice for:
- Medical shafts
- Aerospace components
- Hydraulic rods
- Precision machined parts
17-4 Common Applications
Industries rely on 17-4 PH AMS 5643 round bar for:
- Medical device components
- Aerospace fittings and fasteners
- Pump and valve parts
- Oil & gas equipment
- High-strength shafts and pins
Its combination of strength and corrosion resistance makes it a versatile material across multiple demanding environments.
17-4 PH vs Other Stainless Grades
Compared to standard grades like 304 or 316:
- Stronger: Significantly higher tensile strength after aging
- More stable: Better dimensional control after heat treatment
- More versatile: Multiple heat treatment options
Compared to 416:
- Better corrosion resistance
- Slightly lower machinability
Sourcing 17-4 PH AMS 5643 Round Bar
When sourcing 17-4 PH round bar, it’s important to ensure:
- Compliance with AMS 5643 requirements
- Proper heat treatment traceability
- Consistent diameter tolerances
- Straightness and surface finish quality
Mozaic Precision Metals supplies precision ground and centerless ground 17-4 PH round bar tailored for demanding machining applications, including long-length bars for Swiss-type and CNC machining.
Also Serving Midwest Manufacturers
Manufacturers across the Midwest—including Illinois, Wisconsin, and Indiana—rely on consistent supply of high-quality 17-4 PH round bar for production-critical components.
Also serving nearby manufacturing hubs such as Chicago and Milwaukee.
17-4PH AMS 5643 Request a Quote
If you’re sourcing 17-4 PH AMS 5643 round bar for your next project, contact Mozaic Precision Metals for:
- Competitive pricing
- Tight tolerance grinding
- Fast turnaround times
- Reliable material sourcing