Keo 907-000-138 Combo Drill Countersink 3/8 in Hss

Product Description

The KEO 907-000-138 is a combination drill and countersink designed for simultaneous drilling and countersinking in a single pass. Built from high-speed steel with a bright, uncoated finish, this double-end tool is rated for trade size 4-1/2 and features a 3/8 inch body diameter with a 9/64 inch drill point diameter. The 118-degree drill point angle and 82-degree included countersink angle make it well suited for preparing holes to accept flat-head fasteners. At 6 inches in overall length, it qualifies as a long-length tool and delivers extended reach in deeper setups. Right-hand cutting direction is standard for conventional drill press and hand-drill operation.

This combo drill countersink is intended for metalworking and fabrication applications where countersunk fastener seating is required. It is commonly used in sheet metal work, structural fabrication, and general machine shop operations. The plain cutting edge style and double-end configuration allow the tool to be reversed for extended service life once one end shows wear. It is not designed for aircraft-style countersinking and is not tapered, making it straightforward to use in standard drill press or CNC setups.

Key Features

• Combination drill and countersink completes two operations in one pass
• High-speed steel construction with bright uncoated finish for general-purpose cutting
• Double-end design extends usable tool life
• 118-degree drill point angle and 82-degree included countersink angle for standard flat-head fastener prep
• Long-length at 6 inches overall for extended reach applications
• Right-hand cut, plain cutting edge, non-tapered body for compatibility with standard drill equipment

Compatibility

Designed as an OEM-style replacement or direct-use combination drill countersink for standard drill press, hand drill, and CNC spindle setups requiring trade size 4-1/2 countersinking in metalworking and general fabrication operations.

Installation Notes

Installation and use of this tool is typically performed by machinists, fabricators, or maintenance technicians using a drill press, milling machine, or hand drill. Secure the workpiece firmly before operation and verify spindle speed is appropriate for the material being cut. Inspect the cutting edges before each use and do not use a damaged or dull tool. Eye protection and appropriate chip management practices should be observed at all times.