Hertel 48538151 No. 11 Wire Drill Bit 135 Split Point Hss

Product Description

The HERTEL 48538151 is a short-series threaded shank drill bit designed for precision drilling in low-tensile strength materials. Built from high speed steel (HSS) with an oxide coating, it carries a No. 11 wire gauge size, which corresponds to a decimal diameter of 0.1910 inches. The 135-degree split point geometry reduces walking on entry and lowers the thrust required to start the cut, making it well suited for hand-held or fixture-mounted drilling operations. Overall length is 1.25 inches with a 9/16-inch (0.5625-inch) flute length. The 1/4-28 threaded hex shank secures positively in compatible threaded-shank chucks and holders commonly used in aerospace and production drilling fixtures.

This bit is intended for drilling in low-tensile strength materials including aluminum alloys, plastics, and similar substrates commonly encountered in light manufacturing, aerospace assembly, and maintenance repair operations. The short overall length provides rigidity in applications where stub-length drills are preferred to minimize deflection. The web-thinned, tapered web configuration further reduces cutting force and helps control chip formation in through-hole and blind-hole applications. It is suitable for use by machinists, aerospace technicians, and maintenance technicians working with threaded-shank drill systems.

Key Features

• No. 11 wire size, 0.1910-inch decimal diameter for precise hole sizing
• 135-degree split point reduces walking and lowers drilling thrust
• High speed steel construction with oxide coating for wear resistance
• 1/4-28 threaded hex shank for positive retention in threaded-shank holders
• Web-thinned, tapered web reduces cutting force and improves chip flow
• Short-series (stub) geometry adds rigidity and minimizes deflection
• Right-hand cutting, regular spiral flute, NAS 965 Type B specification

Compatibility

Designed for use with threaded-shank drill chucks and holders accepting a 1/4-28 threaded hex shank, per NAS 965 Type B specification. Intended for drilling low-tensile strength materials in general-purpose production and maintenance applications.

Installation Notes

Installation is performed by threading the 1/4-28 shank securely into a compatible threaded-shank holder or chuck — ensure the shank is fully seated and torqued per the tool holder manufacturer's recommendation before use. Verify spindle speed is appropriate for the workpiece material and hole diameter before starting the cut. Inspect the cutting edges for chips or wear before each use, and replace the bit if the split point or flute geometry is visibly damaged. Secure the workpiece in a fixture or vise to prevent movement during drilling.