Security lock ports are used to physically lock Apple displays to a desk or other stationary object using some kind of cable locking system.
Apple generally uses four different types of security lock ports on their hardware products. They are as follows:
| Port Type | Description |
| Large rectangular port | This security port is a rectangular port that measures approximately 6mm x 35mm at the opening. |
| Small rectangular port | This is a slightly smaller rectangular port. It measures approximately 6mm x 22mm at the opening. |
| 1/4-inch Mini-slot port | This is the most recent security lock port. This port is a small, 3mm x 7mm, opening without latches of any kind. It uses a different type of security device than the previous security lock ports. |
| Cable Slotted port | This is a plastic loop on the bottom of the unit that is intended to have a security cable fed through it. |
Use the following chart to determine which type of security device you need for your Apple display.
Note: Generally, security lock ports are located on the back panels of most Apple displays or, in the case of the cable slotted port, on the bottom panels.
| Product | Port Type | Location
(when viewed from rear) |
| 12-inch Monochrome | Small rectangular port | lower left corner |
| 12-inch RGB | Small rectangular port | lower left corner |
| Performa Display | No Security | -- |
| Performa Plus Display | No Security | -- |
| Hi-Resolution Monochrome | Small rectangular port | between power and video |
| Hi-Resolution RGB | Small rectangular port | between power and video |
| Macintosh Color Display | Cable slotted port | security on base |
| Portrait Display | Small rectangular port | lower right corner |
| 16-inch Color Display | Small rectangular port | lower left corner |
| Two-Page Monochrome | Small rectangular port | lower left corner |
| 21-inch Color Display | Small rectangular port | lower left corner |
| Apple Basic Color Display | No Security | -- |
| AudioVision 14-inch Display | Cable slotted port | security on base |
| Apple Color Plus | No Security | -- |
| Multiple Scan 15-inch | Cable slotted port | right-side middle |
| Multiple Scan 17-inch | Small rectangular port | lower left corner |
| Multiple Scan 20-inch | Cable slotted port | security on base |
| Studio Display (17-inch) | 1/4-inch Mini-slot port | lower right corner |
| Multiple Scan 720 | Cable slotted port | lower right corner |
| Multiple Scan 15AV | Cable slotted port | lower right corner |
| ColorSync 17-inch Display | Cable slotted port | rear |
| ColorSync 20-inch Display | Cable slotted port | rear |