ASTM F67 — Unalloyed titanium for surgical implant applications
Also known as: ASTM F67 Grade 4, UNS R50700
The American materials specification covering four grades of unalloyed titanium for surgical implants, of which Grade 4 is the strongest and most used for implant fixtures.
What it covers
What it means in practice
The American counterpart to ISO 5832-2, and the specification most often cited on implant documentation sold into the United States. The four grades differ only in permitted residual elements — chiefly oxygen and iron — which is what raises strength without adding another metal.
Sources
Numbers match the citations beside each claim above.
Primary sources
- [1]ASTM F67 — Standard Specification for Unalloyed Titanium for Surgical Implant Applications (UNS R50250, R50400, R50550, R50700) — ASTM International. Accessed 2026-07-21.