Sandvik Coromant A16T-DDUNR Indexable Boring Bar

Sandvik Coromant A16T-DDUNR is an indexable boring bar designed for turning with the T‑Max P insert system. The family includes variants such as A16T-DDUNR3 and A16T-DDUNR4; the DDUNR4 version lists a 1‑inch shank and right‑hand orientation, while DDUNR3 specifies a 1.2992‑inch minimum bore, both in steel construction. It accepts standard DNMG 11 04 08 inserts (55° diamond or rhombic geometry) with a 3/8‑inch inscribed circle and 0.187‑inch insert thickness, and it supports through‑coolant for chip evacuation and extended tool life. Lead angles are approximately −3° for the R3 variant and −6° for the R4 variant. These tools are intended for precise internal turning and bore finishing in applications such as automotive, hydraulics, and general engineering where reliable insert compatibility and through‑coolant capability are advantageous.