BNC connectors
By convention, the BNC cables from Thorlabs are all male (pin inside). Connecting a BNC cable to a digital terminal on National Instruments BNC-2110 connector block can be done in several ways, see below.
Method 1. Cutting a BNC cable, stripping the wires, and tinning them with soldering alloy. Not recommended, since swapping the BNC cables becomes a hassle, and BNC cable becomes permanently modified.
Method 2. Soldering two wires (AWG 20 or 22) to a female BNC connector, with appropriate insulation, and tinning the wire ends. Works OK, especially if you already have a stock of BNC female connectors.
Method 3. Tinning the ends of a "zip cord" (aka "2-pin") wire (AWG 20 or 22), and connecting its bare ends to a spring-loaded BNC female connector, as shown in the figure below. Spring-loaded connectors are more resilient against loose contacts compared to screw-terminal ones.
Method 4. If you want the cabling look beautiful and professional, get a crimping tool with ferrules 1-1.5 mm2 (eg from AliExpress), a Wago 5 pin connector, and crimp the wire ends with the ferrules. The results are very satisfying.
Examples of low-cost connectors, without any implicit validation of these particular vendors.