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AMS 4921
AMS 4921 Medical Titanium for Implants, Screws & Surgical Gear
AMS 4921 (often written ams4921) is a high-strength commercially pure titanium specification—commonly aligned with CP Grade 4—engineered for demanding medical, dental, and surgical hardware. With a typical 70 ksi (483 MPa) minimum yield strength in the annealed condition, AMS 4921 delivers the biocompatibility, corrosion resistance, and cleanliness required for implants, bone screws, plates, instruments, and fixation systems.
What Is AMS 4921?
AMS 4921 is an aerospace/medical materials specification covering titanium bars, wire, forgings, and flash-welded rings supplied in the annealed condition. It is commonly selected for high-strength, thin-walled, corrosion-exposed medical components.
At a glance (typical intent):
Product forms: Bars, wire, forgings, flash-welded rings (annealed)
Strength level: ~70 ksi yield / ~80 ksi tensile (section/orientation dependent)
Use cases: Orthopedic screws, plates, dental implants, surgical tools, trauma hardware
Why Choose AMS 4921 for Medical Devices?
Biocompatible & nickel-free: Ideal for long-term implants and human-contact components.
Highest-strength commercially pure titanium grade (compared to CP-1, CP-2, CP-3).
Outstanding corrosion resistance in body fluids, saline, and sterilization cycles.
Cleanliness and traceability: Supplied with melt certifications and regulatory documentation.
Machinability & finish: Supports precision threading, polishing, and passivation.
Typical Chemistry & Mechanical Targets (Informational)
Values below are typical for CP Grade 4 titanium under AMS 4921. Always refer to the latest revision and drawing/COC requirements.
Typical Chemistry & Mechanical Targets (Informational)
Values below represent common target limits for CP Grade 4 titanium supplied to AMS 4921. Actual purchase orders must follow the latest AMS 4921 revision and your drawing/COC.
Typical Interstitial / Trace Chemistry (Max, wt%)
| Element | Limit (wt%) |
|---|---|
| Oxygen (O) | ~0.40% |
| Iron (Fe) | ~0.50% |
| Carbon (C) | ~0.08% |
| Nitrogen (N) | ~0.05% |
| Hydrogen (H) | ~0.0125% |
| Other (each / total) | ~0.10% / ~0.30% |
| Titanium (Ti) | Balance |
Typical Room-Temperature Mechanical Properties
| Property | Typical Minimum |
|---|---|
| Yield Strength (0.2% offset) | ~70 ksi (483 MPa) |
| Ultimate Tensile Strength | ~80 ksi (552 MPa) |
| Elongation | ~10–15% |
| Reduction of Area | ~25–30% |
(Actual requirements vary with section size, orientation, and governing drawing.)
Forms, Sizes & Conditions
Forms: Bars, wire, forgings, flash-welded rings
Condition: Supplied annealed; stress-relief per drawing
Diameters: Fine wire up to large bar/forging stock
Certifications: EN 10204 3.1/3.2 and full heat/lot traceability
Medical Applications of AMS 4921
Orthopedics: Bone screws, plates, pins, IM components, trauma fixation
Dental: Implants, abutments, orthodontic hardware, mini-implants
Surgical instruments: Drivers, forceps, clamps, rasps
Spinal & CMF: Plates and screws requiring strong thread integrity
Manufacturing & Quality Notes
Melting: Double/VAR melt for low inclusions and consistent chemistry
Machining: Sharp tooling, controlled cuts, high coolant flow
Surface Prep: Passivation/micro-polishing improves cleanliness and corrosion resistance
Inspection: Chemistry, tensile tests, dimensional checks, contamination control, UT if required
Regulatory Support: Traceability supports ISO 13485, FDA & MDR documentation
AMS 4921 vs Other Medical Titanium Options
AMS 4921 (CP-4): Highest strength of CP grades; ideal for screws and small implants
CP-2 / CP-3: Lower strength; easier formability for plates or softer-formed parts
Ti-6Al-4V & ELI: Much higher strength/fatigue resistance for stems, rods, and load-bearing implants
Procurement & Traceability
Request full chemistry and tensile reports with heat/lot traceability
Specify form, diameter, tolerances, and finishing requirements
Confirm annealed condition and any NDT (UT, contamination limits) per print
Titanium Metals specializes in high-quality titanium materials and components for critical industries. Every product is manufactured with precision, tested for strength, corrosion resistance, and purity.
We deliver premium-grade titanium metals engineered for high performance and long-term reliability. Every product is manufactured with strict quality controls, precise dimensions, and flawless finishing to match international standards.
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