Description

12 Hole reference standard. Material: 4130 or 4340 Steel. Contains 12 hole sizes; 1/8 inch (3.175mm), 5/32 inch (3.96mm), 3/16 inch (4.74mm), 1/4 inch (6.35mm), 5/16 inch (7.92mm), 3/8 inch (9.52mm), 7/16 inch (11.09mm), 1/2 inch (12.7mm), 9/16 inch (14.27mm), 5/8 inch (15.87mm), 11/16 inch (17.46mm) 3/4 inch (19.05mm); Each hole contains 0.030″ x 0.030″ x .004″ (+/-.002″) corner EDM Notch, .008″, .020″, .040″ x .005″ ±.002″ x .750″ Long Surface EDM Notches. Includes Test Report and Certificate of Conformance.