Hose / thread adapter

Join two hose or thread sizes that were never meant to meet.

An adapter is two interfaces and the transition between them, which is exactly the part you cannot download — the two diameters are whatever you measured. Each end is set independently: a **hose barb** (ribbed, for flexible tube), a **plain spigot** (smooth, for a push-fit or a clamp), or a **male**/**female** screw thread. **Barbs grip against their own free end.** Each rib ramps gently outward as the tube slides on, then drops back on a square shoulder that the tube has to climb over to come off. Both ends do this in their own direction, so an adapter with a barb at each end holds tube on both sides. **Name the thread standard, don’t type a pitch.** Picking M8 or 1/4-20 takes the diameter and pitch from the published series, so the thread actually mates with the real fastener. Only use Custom when you have measured something that is not a standard. **Garden hose is in the list too** — `3/4-11.5 NH` (and the thin-wall `NHR` most moulded fittings actually use), which is the same thread on 1/2″, 5/8″ and 3/4″ hose. It is cut to a different truncation from a bolt thread, and picking the designation selects that for you. **The bore is derived, and it is clamped.** Left at 0, the through-hole is worked out from the wall thickness at the narrowest section. If you pin a diameter that would open the side of the part — or nick a male thread’s root — it is reduced to the largest one that still leaves a wall. That is why the bore you get can be smaller than the bore you typed. **If a threaded end binds when printed, change Fit, not the diameter.** Fit adds or removes a nozzle-ish 0.15 mm of slack on a female socket without moving the thread form; editing the diameter moves the form with it and the pair stops matching the standard.

  1. Open the Generate panel from the left sidebar and choose Hose / thread adapter (under Adapters).
  2. Set End A: pick hose barb, plain spigot, or a male/female thread, then its diameter and length.
  3. Set End B the same way — the two ends are independent, which is the whole point.
  4. For a threaded end, pick the standard (M8, 1/4-20, …) rather than typing a pitch.
  5. Choose the transition shape and length, and a hex or knurled grip if you will tighten it by hand.
  6. Generate: the adapter drops in as one editable body, bored through.