History of Threads
400 BC Archytas (Founder of Mechanics) Used to extract oil and juice.
250 BC Archimedes- Developed the principle (Screw Pump) which was used for drawing water.
1750- Antoine Thiout- Created Lead screw on a lathe to make threads
1770- Jesse Ramsden- Invented more accurate gear changing lathe for accurate threads
1770 to 1841- Threads were being created and shit got crazy
1841- Joseph whitworth in Britain proposed 2 principles
- 55 degrees
- Various diameters gets threads per inch (Whitworth Thread)
1864- William Sellers (American) proposed- 60 degree flat Roots and Crests
American Standard Course Threads (NC) Fine Series (NF)
Metric- Around the same time (Continental Europe) German and French and metric developed 60 degree with Flat Crests and roots
British- 55 Degree radial crest and root
Metric- 60 Degree Flat crest radial root
US- 60 Degree Flat crest and root