Vintage Lufkin Rule Co. "Banner" No. 40-6 Flat-Leg Spring Divider 6” USA

Description

View Vintage Lufkin Rule Co. "Banner" No. 40-6 Flat-Leg Spring Divider 6” USA with current marketplace pricing, condition, product images and item details. Design & Engineering AnatomyHigh-Rigidity Flat Legs: The structural design utilizes sheet steel die-cut into a flat, rectangular cross-section. Solid Nut & Threaded Rod: Unlike cheaper "quick nut" split styles, this model features a solid knurled steel nut. Item is in good condition. Fully functional. Tips are very sharp. Lufkin "Banner" No. 40-6 Flat-Leg Spring Divider, manufactured by the Lufkin Rule Co. in Saginaw, Michigan, USA. The specific construction highlights its origin from mid-20th-century American precision manufacturing. Manufacturing & Historical DetailsProduction Era: This tool was produced between the 1930s and the 1960s. Lufkin was an industry titan in measuring rules and tapes, but they also produced a highly respected line of machinist tools until phasing them out after a corporate acquisition. The "Banner" Line Nomenclature: Lufkin used the "Banner" name for its premier line of flat-leg tools. In their historical Precision Tool Catalog 9, the model code follows a strict formula: No. 40 designates the flat-leg spring divider design, and the suffix -6 represents its 6-inch capacity size. Design & Engineering AnatomyHigh-Rigidity Flat Legs: The structural design utilizes sheet steel die-cut into a flat, rectangular cross-section. This profile provides maximum resistance against lateral flexing, ensuring that the sharp points do not "give" or deflect sideways when scribing hard materials like sheet metal. Forged Needle Points: The ends of the flat legs transition into seamlessly swaged, round needle points. These tips were induction-hardened at the factory to retain their sharpness even when scratching lines into carbon steel or cast iron. Fulcrum Bow Spring: The highly flexible, "C"-shaped loop spring at the top provides constant outward tension on the legs, keeping the layout measurement absolutely rigid. Solid Nut & Threaded Rod: Unlike cheaper "quick nut" split styles, this model features a solid knurled steel nut. While it takes a few extra turns to adjust across wide distances, it offers rock-solid reliability and micro-adjustment accuracy that will not slip under pressure. Condition: Used. Category: Collectibles › Tools, Hardware & Locks › Tools › Machining. Brand: Lufkin.

Brand

Lufkin

Country of Origin

United States