The 83BB1-002 is a standard 4x4 keypad from Grayhill's Series 83 unsealed keypads, featuring 16 buttons arranged in a 4x4 matrix configuration with 0.5-inch button centers. The keypad utilizes snap-dome contact technology to provide positive tactile feedback and is post-mounted with grooveless retaining ring or heat upset post mounting options. Key dimensional specifications include a button size of 0.366 inches square, mounting posts of 0.086 inches diameter at 4 locations, and retaining studs spaced 0.100 inches between terminals. The molded-in legend displays hexadecimal characters (0-9, A-F) arranged as 0-3 in row 1, 4-7 in row 2, 8-B in row 3, and C-F in row 4. This keypad is ideal for industrial control panels, telecommunications equipment, and data entry applications requiring reliable numeric and alphanumeric input.