Threaded Drill Bits #27

#27 Threaded Shank Cobalt Drill Bits for Aircraft Maintenance

#27 threaded shank cobalt drill bits are precision drilling tools designed for aircraft maintenance, repair, and overhaul applications. These threaded shank adapter drills are manufactured to NAS 965 Type D standards and feature a 135-degree split point for accurate starting and controlled drilling.

The #27 drill size is a small-diameter drill commonly used for precision drilling applications, including aircraft sheet metal, components, and fastener holes. The threaded shank design provides a compact connection to compatible threaded drill adapters, making these drills useful when working in the confined spaces frequently encountered during aircraft maintenance.

Cobalt construction provides increased heat resistance and durability for demanding drilling applications. Combined with the 135-degree split point and threaded shank design, these drills provide aircraft maintenance technicians with a specialized drilling option for applications requiring precision and compact tooling.

#27 Threaded Drill Bit Sizes and Lengths

BAC offers the #27 threaded cobalt drill in three overall lengths. Selecting the appropriate length allows technicians to match the drill to the available workspace and the amount of reach required for the application.

Why Use a #27 Threaded Shank Drill Bit?

Aircraft maintenance often requires drilling relatively small holes in locations where access is restricted and tool control is important. A #27 threaded shank drill provides a compact drilling solution while retaining the cutting characteristics of a cobalt drill.

• #27 drill size: Provides a small-diameter drill size for precision aircraft drilling and fastener-hole applications.
• 1/4-28 threaded shank: Designed for use with compatible threaded drill adapters and drilling systems.
• Cobalt construction: Provides increased heat resistance and durability for demanding drilling operations.
• 135-degree split point: Helps the drill start accurately and reduces walking when beginning a hole.
• NAS 965 Type D: Manufactured to the requirements associated with NAS 965 Type D threaded shank adapter drills.
• Three length options: Long, short, and stub configurations allow technicians to select the appropriate drill length for the available workspace.

#27 Drill Bits for Aircraft Maintenance

#27 threaded drills are useful for precision drilling operations involving aircraft sheet metal, structural components, and small fastener holes. Their threaded-shank configuration can be particularly useful when working in areas where a conventional drill and chuck arrangement is difficult to position.

The compact design also gives aircraft maintenance technicians flexibility when working around existing aircraft structure and components. The choice of long, short, or stub length allows the technician to select a configuration appropriate for the available access.

Choosing the Correct #27 Drill Length

Drill length should be selected based on the accessibility of the drilling location and the amount of reach required. Whenever practical, choose a configuration that provides adequate access without adding unnecessary length.

The 9/16" stub provides the most compact configuration and is useful when working in restricted spaces. The 1-1/4" short version provides additional reach while remaining relatively compact. The 2-1/8" long version provides the greatest reach when the drilling location requires additional length.

NAS 965 Type D Threaded Shank Drill

These #27 threaded shank adapter drills are manufactured to NAS 965 Type D standards and feature a 135-degree split point. NAS 965 Type D is an important specification for aerospace tooling and helps identify drills designed for threaded shank adapter applications.

Threaded Shank Drill Bits for Confined Aircraft Areas

A major advantage of a threaded shank drill is the ability to create a compact drilling setup when used with a compatible adapter. This can be valuable when drilling aircraft components in confined areas where a conventional drill chuck and drill-bit combination may be difficult to position.

The #27 drill size combined with the short and stub configurations gives technicians additional options for accessing restricted work areas while maintaining a precision drilling setup.

#27 Threaded Drill Bit Specifications