Decoding Threading: Internal vs. External Threads in Professional Jewelry

Decoding Threading: Internal vs. External Threads in Professional Jewelry

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A visual comparison of threading types: internal and external threadless

September 2025

Threading matters — not just to professionals, but to every healing piercing. Whether you're ordering jewelry for fresh piercings or restocking for healed ones, understanding how threads work is essential for both safety and studio reputation.

What’s the Difference?

External threading means the thread (like a screw) is on the post and gets pushed through the skin during insertion. In contrast, internal threading places the screw inside the shaft — so the jewelry passes through the body smoothly, without friction or tearing.

Why Internal Threading Is Best Practice

Professional studios — especially those following APP or AAPQ standards — almost universally use internally threaded or threadless jewelry. Here's why:

  • Prevents microtears and tissue trauma during insertion
  • Allows for more precise alignment and secure fastening
  • Works best with implant-grade materials like ASTM F136 Titanium

When Threadless Is Better

Threadless (press-fit) jewelry has become the preferred standard for comfort, quick changes, and visual minimalism. Trinity offers a full line of threadless labrets, barbells, and ends for a seamless client experience. Like internal threading, it minimizes friction and reduces healing interference.

Trinity’s Technical Standard

All Trinity internally threaded pieces use 0.8 mm threading — the European standard — to ensure compatibility across professional lines. This threading pairs with our threadless system for a complete, safe offering for initial and long-term wear.

How to Talk Threading with Clients

Clients rarely understand the difference — but they feel it. Use visuals or demos to show why internal/threadless options are safer. Mention:

  • Reduced discomfort during insertion
  • Less irritation during healing
  • Higher-quality materials and engineering

Trust What’s Inside

Open your Trinity wholesale account or learn more about our quality standards. Equip your studio with jewelry that’s engineered to heal — from the inside out.