Hertel 84023837 3/16 in Stub Drill Bit 135 Pt Hss

Product Description

The HERTEL 84023837 is a threaded-shank stub-length drill bit designed for precision drilling in low-tensile-strength materials. It features a 3/16-inch diameter with a 135-degree split point and a web-thinned, tapered web configuration that reduces walking and improves centering on entry. The 1/4-28 hex shank threads directly into compatible quick-change and power-screwdriver-style chuck systems. Built from high-speed steel with an oxide coating, the bit resists heat buildup during normal cutting operations. Overall length is 9/16 inches, making it well suited for confined-space drilling where a jobber-length bit would be impractical.

This stub drill bit is used in aerospace, sheet-metal, and general maintenance applications where close-quarter drilling is required. The NAS 965 Type B specification makes it appropriate for fastener-hole work on aircraft and defense assemblies, as well as general industrial maintenance tasks involving aluminum, plastics, soft steel, and other low-tensile-strength stock. The right-hand spiral flute with 5/16-inch flute length provides adequate chip evacuation for the short cutting depth typical in stub-format drilling.

Key Features

• 135-degree split point with web thinning for self-centering entry and reduced thrust
• 1/4-28 threaded hex shank for secure engagement in quick-change chuck systems
• Stub-length body (9/16-inch OAL) for use in tight clearance areas
• High-speed steel construction with oxide coating for heat and wear resistance
• Right-hand spiral flute for efficient chip evacuation in standard drilling operations
• Meets NAS 965 Type B specification for aerospace and industrial use

Compatibility

Designed as a direct-fit replacement for NAS 965 Type B stub drill bits with a 1/4-28 hex threaded shank, compatible with quick-change and threaded-chuck power tools accepting that shank standard.

Installation Notes

Thread the shank fully into the chuck and verify engagement before applying power. Use cutting fluid appropriate for the workpiece material to extend bit life and improve hole finish. Ensure the workpiece is secured before drilling to prevent workpiece rotation. Inspect the cutting edges and point geometry before each use and replace the bit if chipping or dulling is observed.