Double-male studs and nipples with a male thread on each end — joining or converting two male threads in any combination: metric, UNC/UNF, BSP, NPT. Same or different thread each end, machined to your two sizes.
A male-to-male (double-male) adapter is a short machined stud with an external thread on both ends. It solves three jobs a catalog rarely covers at once: joining two female ports, extending a stud, or converting one male thread to a different male thread — for example bringing an M12×1.5 male end out to a 1/4" NPT male end. Because each end is turned independently, the two threads can be any combination you need.
This is a different form from a female-to-male reducer (which screws over a male thread) and from the general forms compared on our thread adapter types guide — start there if you are not sure which gender you need.
Any two of these on one stud, parallel or tapered, coarse or fine, right- or left-hand:
| Thread family | Examples | Standard referenced |
|---|---|---|
| Metric | M6–M48, coarse & fine (M12×1.5, M20×1.5…) | ISO 261 / ISO 68-1 / DIN 13 |
| Unified inch | UNC, UNF, UNEF — ¼"–2" | ASME B1.1 |
| BSP parallel (G) | G1/8–G2, sealing on washer/O-ring | ISO 228-1 / BS EN ISO 228 |
| BSP taper / NPT | Rc/R, 1/8–2" NPT, self-sealing | ISO 7-1 · ASME B1.20.1 |
| Whitworth | BSW/BSF for legacy machinery | BS 84 |
An adapter's material sets its cost, corrosion resistance and how it seals and machines. Most go out in brass or stainless; the job decides:
| Material | Density | Why choose it for an adapter |
|---|---|---|
| Brass (CZ121 / C360) | 8.5 g/cm³ | The default — free-machining, good sealing, low cost, non-sparking |
| Stainless 303 | 7.9 g/cm³ | Free-machining stainless for general corrosion resistance |
| Stainless 316L | 8.0 g/cm³ | Marine, chemical and washdown; the workhorse for harsh media |
| Steel (zinc-plated) | 7.85 g/cm³ | High-pressure hydraulic strength at low cost |
| Aluminum 6061 | 2.70 g/cm³ | Light, for low-pressure and weight-sensitive use |
| Titanium Gr5 | 4.43 g/cm³ | Light, very strong and corrosion-proof — premium and aerospace |
A double-male adapter, G1/4 parallel one end, M14×1.5 the other, with a bonded-seal shoulder under the G end. Machined in brass or 316L, sealed to the pressure you specify.
A double-male stud with a wrenching hex in the middle, M16 one end, 5/8" UNC the other. We match the pitches exactly and gauge both threads before it ships.
Tapered both ends for self-sealing, machined to ASME B1.20.1 and ISO 7-1 — one stud that joins two standards that were never meant to meet.
Not sure of the gender? If one side needs to screw over a male thread, you want a female-to-male adapter instead. Crossing metric and imperial? See metric-to-imperial adapters. Send us the two parts and we'll confirm the right form.
A short machined stud with an external thread on each end — it joins two female ports, extends a stud, or converts one male thread to a different male thread. The two ends can be the same or completely different.
Yes — that's the point. Any two threads: metric to metric of a different pitch, metric to UNF, BSP to NPT, coarse to fine, or left-hand to right-hand. Each end is machined independently.
Related: a stud usually has the same thread each end for clamping; a male-to-male adapter converts or joins two different threads, often with a central hex. We machine both — see double-end studs.
Yes — a parallel thread seals on a bonded washer, O-ring or face; a tapered thread (NPT/BSPT) seals on the thread. We machine the right sealing form for each end.
The thread and pitch for each end, parallel or tapered, overall length, whether you need a hex, the material — or the two parts you're joining. Quote in 24 hours.
Tell us the two male ends and the material. Engineers reply in 24h.
// Qty & price
1 pc
Sample price
Confirm fit before a run
3–50
Unit price drops
Setup cost shared
50+
Best price
All tiers quoted upfront
Any two ends — metric, UNF, BSP, NPT — on one machined stud, sealed for pressure if needed. Quote in 24 hours.