A precision master reference tool used as a standard for setting micrometer calipers and snap gages; also in setting up and checking comparators. It consists of a flat steel disk, or a cylinder, precision ground and lapped to size.
Classification: Drawing, marking-out or mathematical calculating instruments, nesoi
NSN 5930-01-521-9367
NSN 6645-00-140-5173
NSN 6610-00-361-6954
NSN 6645-01-255-9886
NSN 6650-00-207-9639
NSN 6220-01-386-3082
NSN 6150-00-882-2956
NSN 6130-01-471-4283
NSN 5910-01-256-4161
NSN 5945-01-227-0128
NSN 2925-00-221-4977
NSN 5998-01-359-2579