Feature of Size - One cylindrical or spherical surface, or a set of two opposed elements or opposed parallel surfaces, associated with a size dimension.
Feature of Size Dimension - A dimension that is associated with a feature of size.
Fixed Fastener Assembly - Where the fastener is held in place (restrained) into one of the components of the assembly.
Fixed Fastener Formula - H = F + 2T or T =
Where:
T = position tolerance diameter
H = MMC of the clearance hole
F = MMC of the fastener