Need an M12 to M10 adapter in a specific fine pitch — M12×1.25 or M12×1.0 to M10×1.0 — or in stainless, brass or titanium, that the bulk reducing nuts don't offer? We machine it to order, even at one piece. From a sketch, no CAD. Get a quote →
At M12/M10 there are plenty of cheap brass reducing nuts for lamps and DIY. They come in one or two coarse pitches and one material. The moment you need a particular fine pitch — common on automotive and instrument threads — or a specific material, length or tolerance, the bulk part doesn't exist. That's where machining one to order wins: each end is single-point turned to the exact pitch you specify and gauged, in whatever metal the job calls for.
Coarse or fine? M12 coarse is ×1.75 and M10 coarse is ×1.5, but automotive, optical and instrument parts often use fines like M12×1.25, M12×1.0 and M10×1.0. Tell us the exact pitch on each side — getting it wrong is why a "right size" reducer still won't thread. More on coarse vs fine →
| Option | Choices | Notes |
|---|---|---|
| M12 end | M12×1.75 (coarse) · M12×1.5 · M12×1.25 · M12×1.0 (fine) | Male or female |
| M10 end | M10×1.5 (coarse) · M10×1.25 · M10×1.0 (fine) | Male or female |
| Form | Male-female · reducing insert · double-male · female-female | To suit the job |
| Material | Steel · stainless 304 / 316 · brass · titanium | Open — small part, no tooling cost |
| Drive / finish | Hex · spanner flats · knurl · polished brass | For lighting and visible work |
| Length / bore | To your length · solid or through-bored | Lamp pipe, cable or rod |
Fine-pitch sensor, mirror, linkage and gauge threads that step M12 to M10.
Brass M12-to-M10 adapters and hollow nipples for fixtures and restoration.
Small precise thread conversions on mounts, arms and accessories.
Standoffs, eye fittings and jig parts where the two threads differ.
An adapter fits only when each end matches its mate's pitch. An M12×1.25 female end will not take an M12×1.75 bolt, and an M10×1.0 male end will not go into an M10×1.5 port — same nominal size, different pitch, and the thread binds after one turn. So an M12 to M10 adapter is specified as two pitches, not two diameters: M12×1.5 female × M10×1.25 male is a different part from M12×1.75 female × M10×1.5 male, and only the coarse-to-coarse pairing is a catalogue item.
To put an M10 sensor, fitting or stud into an M12 tapped hole, the adapter is M12 male on the outside and M10 female on the inside — a reducing insert. To fit an M12 part onto an M10 stud it is the other way round: M10 female × M12 male. Say which part is fixed and which one you are adding, and the male/female split follows from that.
Five millimetres more length, brass instead of steel, an M10×1.0 end instead of ×1.25, or a through-bore for a cable is quoted as a variant of the same drawing, one piece and up, in the same 12 hours.
A plain M12×1.75 to M10×1.5 reducing bush is a stock item in most fastener catalogues and you should just buy it. These are the versions that are not.
| What you need | In the catalogue? | How we machine it |
|---|---|---|
| M12×1.75 × M10×1.5, plain steel | Stocked | Standard coarse-to-coarse reducing bush. Buy it off the shelf — it will be cheaper than anything we turn. |
| M12×1.25 × M10×1.0 — fine on both ends | No | Fine-pitch pairs are where the stock list ends. Both ends single-point cut. |
| M12×1.5 × M10×1.25 — mixed fine pitches | No | The commonest sensor and instrument combination, and the commonest reason this part gets machined. |
| Polished brass, for a visible lamp or fitting | Rare | Stock bushes are plated steel. Brass turned and polished, with a knurl if it is hand-tightened. |
| Through-bored for lamp pipe, cable or a rod | No | A solid reducing bush cannot be bored after plating. We bore it as part of the turning. |
| Cut to a specific length | No | Catalogue bushes come in one length. State the length you need. |
| Titanium or 316 stainless | No | Open at this size — the part is small enough that material barely moves the price. |
| Double-male M12 × M10 stud | Thin | Male-male is a stud rather than a bush; far fewer are stocked. |
| Left-hand thread on either end | No | Not stocked in any size. Cut like any other pitch. |
| Knurled body for hand-tight assembly | No | Knurl form and depth to suit finger grip, not a wrench. |
The pitch options above are the ones listed on this page. If your part uses M12×1.0 or M10×0.75, say so and we cut that.
Can you make an M12 to M10 adapter in a fine pitch?
Yes — fine pitch is exactly where custom pays off. M12×1.25 or ×1.0 and M10×1.25 or ×1.0, as well as coarse M12×1.75 / M10×1.5. Each end is cut to its exact pitch and gauged.
Cheap reducing nuts exist for M12 to M10 — why machine one?
For a light lamp or DIY job a brass nut is fine. You machine one when you need a specific fine pitch, a particular material, a longer or shorter body, a hex, or a tolerance the bulk parts don't hold — or when the combination simply isn't sold.
What materials can you make it in?
Steel, 304/316 stainless, brass for lighting and decorative work, or titanium for light weight. Small parts turn quickly, so material choice is open with no tooling cost. See custom fasteners →
Do you make small quantities?
Yes — MOQ one piece, plus small and medium batches, and we keep your drawing for re-orders. No CAD needed; a sketch or the two callouts is enough.
Tell us your two threads. A sketch, a photo, or the callouts (e.g. "M12×1.25 male → M10×1.0 female, brass, 25 mm long"). Free drawing, quote in 12 hours. Cette page existe aussi en français. Get a quote →
Your fine pitch and material, one piece up. Free drawing, quote in 12 hours.
Send a drawing, sketch, sample or photo — reply within 12 hours. MOQ 1.