Threading is one of the smallest details on a piece of body jewelry, and one of the biggest factors in client comfort. If your studio stocks barbells, labrets, or curved bars, choosing between internally and externally threaded pieces affects insertion, healing, and how clients remember their piercing experience. Here is what the difference actually means.
What the Terms Mean
On externally threaded jewelry, the screw threads are cut onto the outside of the post, and the ball or decorative end has a tapped hole that screws over them. On internally threaded jewelry, the post itself is smooth, with the threads machined into a hole inside the end; a small threaded pin on the post screws into that receiver. The distinction sounds minor, but it changes the entire surface that passes through a piercing.
Why External Threads Cause Trauma
When externally threaded jewelry is inserted, the sharp, raised threads of the post must drag through the fresh piercing channel. Those threads can scratch and tear the delicate tissue, essentially re-injuring the wound every time the jewelry goes in or comes out. External threads also create tiny crevices where bodily fluids and bacteria can collect, making the piece harder to clean and increasing the risk of irritation bumps during healing.
The Healing Advantage of Internal Threading
Internally threaded posts are smooth from end to end, so insertion glides through the piercing without abrading tissue. For fresh piercings, especially oral, lip, and cartilage placements that are prone to irritation, this smoother experience means less swelling, fewer trauma-related bumps, and happier clients. It is why the Association of Professional Piercers and most experienced piercers recommend internally threaded jewelry for initial piercings. The thread engagement also tends to be more secure, so loose balls and lost ends become a rare complaint.
Cost and Quality Control
Internally threaded jewelry requires tighter machining tolerances, because the pin and receiver must match precisely, so it generally costs a little more and demands better manufacturing. Cheap internal threading with sloppy fits can strip or cross-thread, which is why quality control matters when sourcing wholesale. A reputable supplier machines threads accurately and polishes the joints flush, so there is no step or gap between post and end where tissue can catch.
What to Stock
For professional studios, the practical rule is simple: use internally threaded, implant-grade G23 titanium for all initial piercings, and offer both styles for healed-piercing jewelry, where external threading remains a budget-friendly option.
G23 Piercing Supply stocks a wide range of internally threaded G23 titanium jewelry, including labrets, flat-backs, barbells, curved bars, and clickers, with low wholesale MOQs and full OEM options. View the catalog at g23titanium.com, use the Contact page for inquiries, or message WhatsApp at +86 15889309450 to request samples and pricing.