Which sleeve would be used to adapt a #2 shank drill to a #4 spindle?

• A. A #2 to #4 drill sleeve
• B. A #4 to #2 drill sleeve
• C. A 1/2 to 3/8 sleeve
• D. An adaptor sleeve with 1/8 inch increments

Answer: (A)

When adapting a drill to a spindle, the sleeve must match the drill’s shank size on the inside and the spindle bore size on the outside. For a #2 shank drill going into a #4 spindle, you need a sleeve whose inner diameter is #2 to accept the drill, and whose outer diameter is #4 to fit the spindle. That is exactly what a #2 to #4 drill sleeve provides, enabling a secure, concentric fit and proper grip in the spindle.

The other options don’t fit this pairing because they either reverse the sizes (inner would need to be #4 or the outer #2), making the drill or spindle incompatible, or they use generic or unrelated size references (like inches or many increments) that don’t specifically match the #2 shank to #4 spindle combination.