Inch series1 standard6 specification pages
4-40 Fasteners
Every 4-40 screw in the database. 4-40 has a nominal major diameter of 0.112 in, threaded 40 tpi to the UNC series, across 1 standard. Rivets are not on this page: they carry no thread, so they are indexed by shank diameter rather than by size designation.
Nominal Ø0.112 in
Threads per inch40 tpi
Pitch Ø0.0957 in
Tap drill0.087 in
4-40 thread dimensions
Full thread page- Designation
- #4-40 UNC
- Major diameter
- 0.112 in
- Threads per inch
- 40 tpi
- Pitch diameter
- 0.0957 in
- Minor diameter — external
- 0.0815 in
- Minor diameter — internal
- 0.085 in
- Tap drill size
- Ø 0.087 in
4-40 Screws
6 pagesASME B18.3Socket Head Cap Screw — Inch Series