Hertel 18585 Countersink 3/16 in 100 Deg 4 Flute Hss

Product Description

The HERTEL 18585 is a straight-shank countersink designed for creating clean, beveled seat recesses in metal and other materials ahead of flat-head fastener installation. Built from high speed steel (HSS), it delivers the hardness and wear resistance needed for production drilling and maintenance work alike. The head diameter measures 3/16 inches with a matching 3/16-inch straight cylindrical shank, and the included angle is 100 degrees. Four flutes provide good chip clearance and smooth cutting action in both hand-drill and machine applications. This tool is suited for machinists, toolroom technicians, and maintenance trades working with countersunk fastener patterns on ferrous and non-ferrous workpieces.

The 18585 countersink fits into standard drill chucks and collet holders that accept a 3/16-inch straight shank. Its 100-degree included angle is commonly specified for aerospace and sheet-metal fastener standards where a slightly wider seat angle than the common 82-degree pattern is required. This makes it a practical choice for sheet metal fabrication shops, aircraft maintenance facilities, and general metalworking environments handling countersunk hardware to the applicable fastener seat specifications.

Key Features

• 3/16-inch head diameter with a 3/16-inch straight cylindrical shank for direct chuck or collet mounting
• 100-degree included angle suits fastener seat specifications requiring a wider countersink profile
• 4-flute design promotes chip evacuation and consistent seat finish
• High speed steel construction provides hardness and edge retention across ferrous and non-ferrous materials
• Straight-cylindrical shank compatible with standard drill press and hand-drill chucks

Compatibility

Designed as a direct-fit replacement or addition for any drill press, CNC drill station, or hand drill accepting a 3/16-inch straight cylindrical shank tooling; verify that the 100-degree included angle matches the fastener seat specification of your application before installation.

Installation Notes

A licensed machinist or qualified metalworking technician should confirm workpiece material and fastener seat angle requirements before use. Secure the shank fully in the chuck or collet and verify runout before engaging the workpiece. Operate at speeds appropriate for the workpiece material and tool diameter per standard machining practice. Wear appropriate eye protection and ensure the workpiece is clamped securely before cutting.