Thread gauge STL file

TECHNICAL NOTES

Conversation-specific knowledge extracted from the thread gauge stl file discussion.

EXTRACTED KNOWLEDGE / HOW-TO FROM CONVERSATION

QUESTION / CONTEXT: I want a stl file of a thread gauge, on the left half I want to be able to thread bolts into it to verify the threads and on the right side I want approximately an inch of a a threaded bolt sticking up so I can use it to verify nut sizes

1. Left side: four pilot holes sized to let you *self-thread* common bolts directly into the plastic (perfect for quick ID): 1/4-20, 5/16-18, M6×1.0, M8×1.25.
2. Right side: a captured 1/4-20 metal bolt. You insert a real bolt from the bottom into a hex pocket so the threaded shank (~1") sticks up on top for checking nut sizes (no printed threads to wear out).
3. OpenSCAD source (ready to render/export to STL):
4. Print the part with the hex pocket facing down.
5. Press a 1/4-20 hex bolt up from the bottom; the head will capture in the pocket. If you want the stud locked in, add a nut on top as a jam nut.
6. On the left, just drive your bolts into the pilot holes—plastic “cuts” threads for a snug check fit.
7. 1/4-20 pilot ≈ 0.201 in (5.11 mm)
8. 5/16-18 pilot ≈ 17/64 in (6.75 mm)

SPECIFICATION

DEVELOPMENT HISTORY