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The company began as Moore Drop Forging Company in Springfield, Massachusetts in 1900 [1] or 1901. [2] In 1938 Moore became a vendor for Sears Roebuck. [1] In 1967, Moore Drop Forging was acquired by Eastern Stainless Steel Corporation, a manufacturer of stainless and specialty steel. Easco continued the Craftsman contract with Sears.
Craftsman is a line of tools, lawn and garden equipment, and work wear.Originally a house brand established by Sears, the brand is now owned by Stanley Black & Decker.. As with all Sears products, Craftsman tools were not manufactured by Sears during the company's ownership, but made under contract by various other companies.
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.
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.
In addition, 10 mm (0.393 in), and letter X (0.397 in) will work well, although major minus pitch by itself does not tell you this; but the 90% ± 2 pp guideline supports it. For both of these rules of thumb (85%/90% and major minus pitch), the tap drill size yielded is not necessarily the only possible one, but it is a good one for general use.
North Bros. tool brand was called Yankee, much as Sears tools are branded Craftsman, and every tool they sold sported this trademark. In later years the Yankee name would become synonymous with the spiral ratchet screw driver invented by Furbish but it was originally seen on everything from bench vises to cutting tools.