ASME B18.6.3 Type 1A Cross Recessed Undercut Flat Countersunk Head Machine Screws
Dimensions of ASME B18.6.3 Type 1A Cross Recessed Undercut Flat Countersunk Head Machine Screws
| Nominal Size or Basic Screw Diameter | Length, L | Head Diameter, A | Head Height, H | Recess Diameter, M | Recess Depth, T | Recess Width, N | Driver Size | Recess Penetration Gaging Depth | Protrusion Above Gaging Diameter, F | Gaging Diameter, G | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Max | Min | Max | Min | Max | Min | Max | Min | |||||||
| -- | -- | |||||||||||||
Note :
- Where specifying nominal size in decimals, zeros preceding the decimals and in the fourth decimal place shall be omitted.
- Screws of these length and shorter shall have undercut heads.
- No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected accordingly and the proper protusion values must be recalculated using the formulas.
- No practical to gage.