What Size Drill Bit to Drill Out of Lock: A Comprehensive Guide

Drilling into a lock can be a challenging task, especially if you’re not sure which drill bit size to use. The wrong size can damage the lock, making it inoperable. In this article, we will explore the different factors to consider when choosing the appropriate drill bit size for drilling out of a lock.

Understanding Lock Types

Before selecting a drill bit size, it’s essential to understand the type of lock you’re dealing with. There are various types of locks, including mortise locks, cylindrical locks, and padlocks. Each type has different dimensions and requires a specific drill bit size.

Drill Bit Materials

The material of the drill bit is crucial in determining its effectiveness and durability. High-speed steel (HSS) is a common material used for drill bits, as it provides good heat resistance and durability. However, for more challenging tasks, cobalt or carbide drill bits may be more suitable.

High-speed steel (HSS) drill bits are suitable for most lock drilling tasks. They are versatile, affordable, and can handle a wide range of materials. Cobalt drill bits are designed for harder materials, such as stainless steel, and can withstand higher temperatures. Carbide drill bits are the most durable and can handle the toughest materials, but they are also the most expensive.

Drill Bit Point Types

The point type of the drill bit is another critical factor to consider. There are three main types: straight, ball, and spiral point.

• Straight Point: This type of point is suitable for drilling straight holes and is ideal for cylindrical locks.
• Ball Point: A ball point drill bit is designed for drilling at an angle and is perfect for mortise locks.
• Spiral Point: Spiral point drill bits are designed for removing material quickly and are ideal for drilling through locks with multiple pins.

Drill Bit Size Selection

Selecting the correct drill bit size is crucial to avoid damaging the lock. Here are some general guidelines for choosing the appropriate drill bit size:

• Mortise Locks: Use a drill bit size between 1/8″ and 3/16″. A 1/8″ drill bit is suitable for locks with a smaller diameter, while a 3/16″ drill bit is ideal for locks with a larger diameter.
• Cylindrical Locks: Use a drill bit size between 3/16″ and 1/4″. A 3/16″ drill bit is suitable for locks with a smaller diameter, while a 1/4″ drill bit is ideal for locks with a larger diameter.
• Padlocks: Use a drill bit size between 1/4″ and 3/8″. A 1/4″ drill bit is suitable for locks with a smaller diameter, while a 3/8″ drill bit is ideal for locks with a larger diameter.

Drilling Techniques

Once you have selected the appropriate drill bit size, it’s essential to use the correct drilling techniques to avoid damaging the lock. Here are some tips:

• Apply Light Pressure: Apply light pressure to the drill bit to prevent it from slipping or damaging the lock.
• Use a Drill Press: If possible, use a drill press to maintain consistent pressure and speed while drilling.
• Drill Slowly: Drill slowly to allow the drill bit to cut through the material without overheating or damaging the lock.
• Keep the Drill Bit Cool: Use a cooling fluid