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The Craftsman trademark was registered by Sears on May 20, 1927. [2] Arthur Barrows, head of the company's hardware department, liked the name Craftsman and reportedly bought the rights to use it from the Marion-Craftsman Tool Company for $500 (equivalent to $8,770 in 2023). [3] The brand's early customers were mostly farmers.
Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.
Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.
A screwdriver-type handle for hand turning with a built-in female socket at the end of either metric or fractional inch sizes. May be of different lengths. flex-head socket wrench Saltus wrench Combination wrenches with a fixed socket in place of the box end. T-handle A socket attached to a T-handle that is used for leverage.
where is the tap drill size, is the major diameter of the tap (e.g., 10 mm for a M10×1.5 tap), and pitch is the pitch of the thread (1.5 mm in the case of a standard M10 tap) and so the correct drill size is 8.5 mm. This works for both fine and coarse pitches, and also produces an approximate 75% thread.
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