Need an M24 to M20 adapter or reducing bushing that holds pressure or load — turned from solid steel or stainless, in the exact pitch your port or thread uses? We machine it to order, sealing or plain, male-female or as a bushing. From a sketch, no CAD, one piece up. Get a quote →
Plenty of M24/M20 reducers exist as thin zinc bushings for light duty. The M24-to-M20 size, though, sits right in hydraulic and machine-build territory, where the joint carries pressure or mechanical load. That's what we make: a part turned from solid bar, with the thread class and concentricity controlled, and — if it has to seal — the correct seal face for your port. Because it's machined to order, the pitch, length, hex and seal are whatever your fitting actually needs, including combinations no catalog lists.
Sealing or mechanical? If the M24/M20 joint passes fluid under pressure, tell us the medium and pressure and whether the seat is parallel (BSPP-style) or tapered — we cut the matching seal face. If it just transmits load or position, no seal is needed and we hold thread fit and squareness.
M24 male to M20 female (or reverse) — convert or extend a threaded line or port.
M24 male outside, M20 female inside — steps a tapped M24 hole down to M20.
M24 male and M20 male — joins two female ports or housings.
M24 female and M20 female — joins two male threads end to end.
| Option | Choices | Notes |
|---|---|---|
| M24 end | M24×3.0 (coarse) · M24×2.0 · M24×1.5 (fine) | Hydraulic ports often ×1.5 |
| M20 end | M20×2.5 (coarse) · M20×1.5 · M20×1.0 | Male or female |
| Seal | Plain · O-ring groove · 60° seat · bonded-seal face | For pressure joints |
| Material | Steel · alloy steel 42CrMo4 · stainless 304 / 316 | Plated or passivated |
| Drive | Hex across flats · spanner flats | To a standard wrench where possible |
| Bore | Solid · through-bore for fluid / shaft | Bore size to suit flow |
If a plain reducer in this step exists on a stockist's shelf, buy it. These are the versions that do not exist as a part number.
| What you need | In the catalogue? | How we machine it |
|---|---|---|
| A plain coarse-to-coarse reducer in this size step | Sometimes stocked | If a stockist lists it, buy it off the shelf. We are worth calling when the pitch, length, material or form is not on their page. |
| A hydraulic or load-bearing joint rather than a cable entry | No | At M24 this pair usually carries load. Alloy steel and full thread engagement rather than a pressed reducer. |
| Different pitch on each end | No | Each thread single-pointed to its own pitch on the same bar. |
| Double-male stud instead of a bush | Thin | Male on both ends; far fewer sizes stocked and almost none in mixed pitch. |
| Female-female coupling | Thin | Joins two studs rather than reducing a hole. Any pitch pair. |
| Hex flats sized to a spanner you already own | No | Cut to your wrench, not to a catalogue table. |
| Through-bore for a shaft, cable or fluid | No | Bore and both threads cut in one setup so they stay concentric. |
| Shortened body for a crowded plate | No | Catalogue parts come in one length. State the space you have. |
| Left-hand thread on either end | No | Not stocked at any size. |
| 316 stainless or alloy steel instead of plated mild steel | Rare | Material is open; no tooling cost at these sizes. |
Can you make an M24 to M20 hydraulic port adapter that seals?
Yes. Tell us the fluid, pressure and whether the seat is parallel or tapered, and we machine the matching seal face or O-ring groove. Mechanical-only joints are left as a plain reducer with controlled thread fit. See hydraulic adapters →
Do you make it as a reducing bushing as well as an adapter?
Yes — M24 male outside, M20 female inside, to step a tapped M24 hole down to M20. We also do male-female, double-male and female-female. Tell us what each side threads into.
Which pitches are available?
M24×3.0/2.0/1.5 and M20×2.5/1.5/1.0, plus non-standard pitches. Each end is gauged. More on coarse vs fine pitch →
What material, and can it take load?
Steel, alloy steel, or 304/316 stainless. Turned from solid bar, so it carries real mechanical and pressure load — unlike a thin pressed reducer. MOQ one piece, no CAD needed.
Tell us your two threads. A sketch, a photo, or the callouts plus the duty (e.g. "M24×1.5 male → M20×1.5 female, 250 bar hydraulic, 316"). Free drawing, quote in 12 hours. Get a quote →
Hydraulic or mechanical, sealing or plain. Your pitch and material, one piece up. Quote in 12 hours.
Send a drawing, sketch, sample or photo — reply within 12 hours. MOQ 1.