Parametric BSPP (G) / NPT Threaded Pipe Adapter

Parametric BSPP (G) / NPT Threaded Pipe Adapter – Customizable Connector

This is a fully parametric pipe adapter designed for BSPP (G) and NPT threads, built for reliable 3D printing and real-world use.

Unlike many “decorative” thread models, this design uses standard thread dimensions (major diameter, pitch, and thread angle) and generates true triangular thread profiles via the proven threads-scad library. The result is stronger, clearer, and more printable threads that actually fit.

🔧 Supported Standards

• BSPP (G / ISO 228) – 55° Whitworth thread profile
• NPT – 60° thread profile (nominal straight-thread form for printed parts)

Common sizes included (expandable):

• G: 1/8, 1/4, 3/8, 1/2, 3/4, 1, 1-1/4
• NPT: 1/8, 1/4, 3/8, 1/2, 3/4, 1, 1-1/4

⚙️ Fully Parametric

You can customize:

• Inlet & outlet thread standard and size
• Male or female threads on each end
• Threaded length
• Wall thickness
• Transition length and shape
• Optional hex wrench flats
• Thread tolerance (single parameter for fit tuning)

All customization is done via simple parameters—no editing of geometry required.

🧵 Designed for 3D Printing

• Clean, triangular thread profiles (not thin fins or fake spirals)
• One-knob thread tolerance for easy printer/material adjustment
• Conservative internal bore sizing to preserve female thread strength
• Works well with PLA, PETG, ABS, Nylon (material-dependent fit)

🖨️ Printing Tips

• Print with higher perimeter count (≥3 recommended)
• Layer height ≤ 0.28 mm for best thread definition
• If threads are tight: increase thread_tolerance slightly
• If threads are loose: decrease thread_tolerance

📌 Use Cases

• Pipe and hose adapters
• Plumbing prototypes
• Workshop fixtures
• Enclosures and fluid routing
• Custom fittings where off-the-shelf parts don’t exist