When working on a kitchen faucet, the wrench size you need can depend on the specific task and the type of faucet you have. Here are some common scenarios and the corresponding wrench sizes that are typically used:

1. Supply Line Connections:Adjustable Wrench: Often, an adjustable wrench (also known as a crescent wrench) is the best tool for connecting or disconnecting the supply lines. It can adapt to various sizes, making it versatile for different nuts and bolts.Standard Sizes: If you prefer a fixed-size wrench, the common sizes for supply line connections are usually 1/2 inch or 5/8 inch.
2. Faucet Mounting Nuts:Basin Wrench: For the mounting nuts that secure the faucet to the sink, a basin wrench is typically the best tool. The basin wrench has a long handle and a pivoting head, allowing it to reach up behind the sink where space is limited. The head usually fits nuts that are 1/2 inch to 1 inch in size.Adjustable Basin Wrench: Some basin wrenches are adjustable and can accommodate a range of sizes, typically from 3/8 inch to 1 1/4 inches.
3. Other Specific Fasteners:Allen Wrenches (Hex Keys): Some faucets have set screws or other fasteners that require an Allen wrench. The sizes can vary, but common sizes are 1/8 inch, 3/32 inch, or 2.5 mm.

Recommended Tools for a Kitchen Faucet:

1. Adjustable Wrench: Versatile for various nut sizes.
2. Basin Wrench: Essential for hard-to-reach mounting nuts.
3. Allen Wrenches: For set screws or specific fasteners on the faucet.

Having these tools on hand should cover most tasks related to installing, repairing, or maintaining a kitchen faucet.