Understanding Fuel Line Fittings: Straight Thread (and AN) vs. Tapered Thread

How to Machine and Seal Metric Cooling Line Threads

Understanding Thread Types - Seaboard Marine

Hydraulic fitting size chart - QC Hydraulics

flex fuel lines Grumpys Performance Garage

Sealing Methods

Havoc Speeds Guide to AN Hose and Fittings - Havoc Speed

Fuel Line Sizing - Return vs Feed, Page 2

Understanding Fuel Line Fittings: Straight Thread (and AN) vs. Tapered Thread

NPT Threading Explained

What is NPT - Conical thread explanation

Fuelab

Thread ID Made Easy

Small-Bore Fittings: Thread Size and Pitch

Understanding NPT and Other Pipe Thread Types