5/8" x 4-1/2" Square Toolbit Assab 17

Assab 17 HSS Square Toolbits are engineered for machinists who need tough, stable cutting blanks capable of being ground to precise and repeatable cutting profiles. Their square format provides excellent rigidity and edge support, making them ideal for turning, facing, parting, grooving, profiling, and general‑purpose metal removal on the lathe. Constructed from Assab 17 high‑speed steel, these toolbits offer outstanding wear resistance, maintain hardness at elevated temperatures, and deliver consistent cutting performance under load. With sizes ranging from small 3/16" blanks suited for delicate machining to large 3/4" toolbits designed for heavy‑duty work, this category supports a wide range of machining tasks across mild steel, alloy steel, cast iron, aluminium, brass, and other engineering materials.Each model is designed to deliver consistent alignment, secure clamping, and dependable rigidity, helping users achieve clean finishes and predictable cutting performance across different materials. Whether set up in manual lathes, toolroom equipment, or general engineering machines, the STH‑31 range ensures proper tool presentation and reliable stability for day‑to‑day machining tasks.