The early 1940s were marked by World War II and the military experienced severe tool shortages as a result. As a preferred supplier to the government, Snap-on was called into action, producing tools that kept air and ground equipment operating. Wartime demands also led to product innovations.

To increase durability of hand tools, the military upgraded the Snap-on material specifications and authorized buying nickel alloy steel, which ultimately became a Snap-on standard. To meet specific demands, hand tools for aviation and large sockets and wrenches for heavy military equipment were also developed.