Sex Doll Head and Body Compatibility: What Actually Fits

One of the most common questions from experienced owners is deceptively simple: can I put this head on that body? People want a second face for a body they already own, a spare head, or a favourite sculpt from one brand on a better body from another. The short answer is that it’s often possible within the mainstream TPE world — and often not possible, or not safe, outside it. This guide explains why, gives you a per-brand reference with honest confidence flags, and provides a deliberately cautious checker. Read it before you spend money on a head expecting it to fit.

There is no official industry standard

It’s worth stating plainly, because a lot of marketing implies otherwise: there is no official, industry-wide head-connector standard for sex dolls. No governing body defines the neck mount, and manufacturers are free to use whatever hardware they like.

What exists instead is a de-facto common connector: the M16 screw thread. “M16” is a 16mm-diameter metric thread on the bolt that joins the head to the neck. It became dominant for a simple reason — the early WM Doll skeleton used it, that skeleton design was widely copied across Chinese factories, and the M16 size came along for the ride. As a result, a large cluster of mainstream TPE brands — WM, YL, SE, SY, 6Ye, JY, Irontech, FunWest and others — share the M16 thread today.

That’s genuinely useful, but here is the crucial nuance: common is not guaranteed. Three things break the “M16 everywhere” assumption:

• Premium silicone brands often go proprietary. Sanhui, Gynoid and EX Doll use their own neck mounts, by design, and are not M16-compatible without a purpose-made adapter (if one exists).
• Some brands are exceptions even when you’d expect M16. Zelex is the notorious one — welded bolts and a non-standard socket on the Inspiration series (details below).
• “Same thread” still isn’t “same fit.” Even two confirmed M16 brands can differ in neck depth, shoulder curvature and head weight, so a head may screw on but sit too high, too low, or at the wrong angle — occasionally needing a spacer or adapter.

So the honest framing is: if both parts are confirmed M16, a swap is plausible and often works; everything else is confirm-first. That principle drives the checker and table below.

Quick compatibility checker

Pick the brand of the head and the brand of the body. This tool is intentionally conservative — it will never tell you two different brands are definitely compatible, because we can’t verify your specific parts. Use it to narrow the field, then confirm with the seller.

Compatibility checker

Head brandSelect a brand…6YeAibei DollAngelKissAXB DollClimax DollCosdollDC DollDoll SeniorDolls CastleElsa BabeEX DollFanrealFirefly DiaryFunWest DollGame LadyGynoid DollHR DollIrokebijinIrontech DollJarliet DollJiusheng DollJX DollJY DollPiper DollQita DollReal LadyRIDMIISanhui DollSE DollShedollSigaFunSino DollStarperySY DollWM DollXY DollYL DollYQ DollZelexBody brandSelect a brand…6YeAibei DollAngelKissAXB DollClimax DollCosdollDC DollDoll SeniorDolls CastleElsa BabeEX DollFanrealFirefly DiaryFunWest DollGame LadyGynoid DollHR DollIrokebijinIrontech DollJarliet DollJiusheng DollJX DollJY DollPiper DollQita DollReal LadyRIDMIISanhui DollSE DollShedollSigaFunSino DollStarperySY DollWM DollXY DollYL DollYQ DollZelex

Choose a head brand and a body brand to see a conservative fitment estimate.

This tool reflects publicly reported connector information, not a guarantee. It is intentionally cautious and will never tell you two different brands are definitely compatible.

Per-brand connector reference

The table below curates what public sources — manufacturer statements, retailer connector/adapter catalogs, and owner-community reports — say about each brand’s neck connector. Confidence flags are shown on every row and matter as much as the connector type:

• Verified — multiple public sources or a clear manufacturer statement support it.
• Reported — a single or community source suggests it; confirm with the seller.
• Unconfirmed — plausible but not publicly established; treat as unknown and confirm.

We never upgrade a brand’s confidence beyond the evidence. A brand marked “Unconfirmed” is not a claim that it isn’t M16 — only that we won’t tell you it is.

The exceptions that catch buyers out

Most fitment mistakes happen at a handful of predictable brands. These deserve their own callouts.

How to confirm fitment the safe way

Because the stakes are two expensive products, treat confirmation as part of the purchase, not an afterthought. A reliable process:

1. Photograph the connector on both parts. With the head detached, photograph the bolt or socket in the neck of the head and the matching hardware on the body. A clear photo tells a knowledgeable seller almost everything.
2. Ask the seller directly, in writing. Give them both brands and the exact models and ask: “Will this specific head fit this specific body, and is any adapter or spacer required?” Keep the answer.
3. Ask about neck depth and angle, not just the thread. Even a correct M16 thread can seat the head too high or low. Sellers who handle swaps regularly will know.
4. Buy the adapter from the seller if one is needed — a matched adapter is far safer than a generic part from elsewhere.
5. Never force it. If a head won’t seat with light hand pressure, stop. Forcing a mismatch is how bolts strip and sockets crack.

If you’re configuring a doll from scratch rather than swapping parts, our guide to what you can actually customise covers head choices at order time, and the first-time buyer’s guide walks through buying safely from a reputable seller.

The bottom line

There is no official head-connector standard — only a widely-shared one, the M16 thread, common across mainstream TPE brands but absent from proprietary silicone brands and undone by exceptions like Zelex. Use the M16 family as a starting point, respect the confidence flags in the table, and remember that “same thread” still isn’t “same fit.” Whatever the reference says, the only thing that actually protects your money is confirming the exact connector on your specific head and body — with photos, in writing, from the seller — before you buy.