Choose security hardware based on the application, mounting location, access method, power requirements, and door or gate construction, including keypads, card or proximity readers, magnetic contacts, electric locks, relays, and backup batteries. For outdoor or gate installations, look for weather-resistant housings, appropriate holding force, surface or face mounting options, and fail-safe or fail-secure operation, while indoor door applications may call for compact keypads, press-fit contacts, or security relays.

When specifying security hardware, confirm whether each device uses 12 or 24 volts AC or DC, requires a rechargeable backup battery, or supports selectable voltage operation. Review connection methods, including hardwired relay outputs, magnetic contacts, Wiegand or OSDP reader connections, and Ethernet with Power over Ethernet (PoE) or Wi-Fi for networked access devices.

Security hardware can support keypad codes, proximity cards, mobile credentials, and multi-technology access through devices such as standalone keypads, card readers, and IP access control units. Installers can combine these readers with electric gate locks, electromagnetic locks, relays, and door contacts to connect access methods with controlled entry points.

When comparing security hardware, look for weather-resistant construction, stainless steel or aluminum housings, sealed circuitry, crush-resistant components, and features such as tamper alarms or vandal-resistant designs. For installation flexibility, compare surface- and flush-mount options, single-gang compatibility, adjustable voltage operation, mounting brackets, conduit connections, and self-aligning hardware that can accommodate common gate or door conditions.