Holes for screws: a clearance hole with a countersink or counterbore for the screw's head, sized for ISO screws from M2 to M12.
Adding one
- Choose Create ▾ › Parts › Countersunk Hole or Counterbored Hole. Each starts for an M3 screw, 10 mm long.
- Place it on a face and it sinks in, its top flush with the face, so the head's countersink or counterbore is at the surface.
- Group it with the part to cut it, as with any hole.
The Hole section
Every round hole has a Hole section in the inspector, a plain Cylinder Hole too:
- Screw: M2 to M12 makes the hole that screw's clearance hole, with its head's countersink or counterbore at the top. Custom shows when it isn't a screw's.
- Top and Bottom: None, Countersink, Counterbore or Chamfer, each with its own sizes: a countersink's Diameter and Angle, a counterbore's Diameter and Depth, or a chamfer's Size.
Countersinks are 90°, made 0.4 mm wider than the screw's head, and counterbores 0.4 mm deeper than a cap screw's head, so heads sit flush.