Alloy Steel Cup Washer with Countersunk Finishing Washer and Flat Lower Bearing Face

Alloy steel grade selection for a countersunk finishing washer with flat lower bearing face determines surface hardness after heat treatment and countersink angle consistency; 4140 alloy steel provides the hardness needed to resist indentation under fastener head load without cracking during the coining process used to form the countersink profile. Suzhou Dazhi Intelligent Manufacturing Technology (Suzhou, Jiangsu) CNC-turns this alloy steel countersunk finishing washer with cup profile and flat lower bearing face using turning and surface grinding at their facility (circa 4,000 m²), with countersink angle, OD/ID, and bearing face flatness confirmed per your drawing during in-process inspection. Dazhi's Suzhou facility specialises in non-standard automation parts, aerospace components, and military parts for automation, aerospace, automotive, and general industry applications. We can quote once we have countersink angle, OD/ID dimensions, bearing face flatness, and alloy steel grade from your drawing. Typical end markets include medical equipment and robotics.