Guhring GT108.4776.020 .25.80.R.U1 Solid Carbide Internal Grooving Bar

This is a new Guhring GT108.4776.020 solid carbide internal grooving bar from Guhring's GT108 Grooving Systems series, catalog item #303559353, made in Germany. The full designation ".25.80.R.U1" decodes as follows: 0.025 in (0.635 mm) groove width, 0.80 in (20.32 mm) maximum boring depth, right-hand cut (R), and U1 uncoated solid carbide grade — the monolithic carbide shank provides maximum rigidity for small-bore internal grooving and snap-ring groove applications. The tool features a stepped/necked-down shank geometry visible in the photos, allowing access to bores as small as approximately 4.776 mm (as encoded in the product suffix "4776"), with the cutting edge ground directly into the carbide blank for precise groove geometry without an indexable insert. Typical applications include internal snap-ring groove and retaining-ring groove machining on CNC lathes and turning centers; the carbide substrate provides the stiffness required to minimize deflection in deep, small-diameter boring conditions.

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