Headwinds proved too much to overcome in the first quarter.Fastenal (FAST -6.96%) continues to see sluggish demand in the industrial sector, and its latest results are weighing on the stock. Shares of Fastenal were down 7% at 3:30 p.m. ET. after the parts distributor reported first-quarter results.Demand remains a questionFastenal is a distributor of industrial and construction supplies, meaning that a lot of its customers were facing headwinds in 2023. But the company's sales have largely held up better-th ...