(Update: thanks to a comment below from alert reader Bernie Greenspan, I eventually located ANSI standard B107.4 which standardized the ¼-inch quick-release hex shank in 1982.)
Many people who try to do projects and repairs around the house or around the office would, I think, report that they experienced two events involving power tools that changed things a lot. One’s life divides into “how it was before I got an oscillating tool and how it was after” and “how it was before I got an impact driver and how it was after”. As will be discussed below, the impact driver uses driver bits and drill bits having a “¼-inch quick-release hex shank”. The main point of this blog article is to raise two seemingly unanswerable questions:
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- When did the ¼-inch quick-release hex shank begin?
- Who thought of the ¼-inch quick-release hex shank? Continue reading “When did the ¼-inch quick-release hex shank begin? Who thought of the ¼-inch quick-release hex shank?”