1/4-20 UNC 2A Thread Ring Gage Set (Go-Nogo) (4101-0321) ~ Gages are “X” tolerance. ~ These are most commonly used for general applications including bolts, nuts, screws and similar fasteners. ~ Sold by the set. Gages are “X” tolerance. These are most commonly used for general applications including bolts, nuts, screws and similar fasteners. Sold by the set. . .
