What type of lead is best suited for layout work in drafting?

For layout work in drafting, the 4H lead is the best choice due to its hardness and ability to produce fine, precise lines. This type of lead is particularly advantageous for detailed work where clarity and accuracy are paramount. The hardness of 4H allows it to maintain a sharp point longer, resulting in less smudging and cleaner lines, which is essential during the initial stages of drafting when layout precision is crucial.

In contrast, softer leads, such as the #2 lead or HB lead, are more suitable for general writing or shading rather than detailed layout work. These leads tend to produce thicker lines, which may not provide the level of detail required for layout specifics. The 2H lead is also relatively hard but does not offer the same level of precision as the 4H lead, making it less optimal for layout tasks where fine detailing is necessary. Thus, among the options given, 4H lead stands out as the superior choice for accomplishing quality layout work in drafting.