Precision Twist Drill 6001502 No. 31 Hss Aircraft Drill

Product Description

The PRECISION TWIST DRILL 6001502 is a No. 31 wire-size high speed steel aircraft extension drill bit designed for demanding metal drilling applications in aerospace and general-purpose fabrication environments. It features a 135-degree split point that is self-centering, eliminating the need for a center punch and reducing walking on hard or curved surfaces. The oxide finish provides a modest layer of surface protection against corrosion and heat. With a 1.625-inch flute length and a 6-inch overall length, this bit reaches into recessed areas and tight clearances that standard-length drill bits cannot access. It is typically installed by machinists, aircraft maintenance technicians, and journeyman sheet metal workers.

This drill bit is suited for through-hole and spot-face drilling in aluminum, mild steel, and similar structural metals commonly encountered in aircraft assembly, automotive fabrication, and industrial maintenance. The 4xD flute-length-to-diameter ratio supports chip evacuation in deeper holes. The straight cylindrical shank with a 0.1200-inch diameter seats securely in standard drill chucks and collet holders. Series 501-6 positions this bit within a family of extension-length HSS drills engineered for production and repair environments where reach and accuracy are critical.

Key Features

• No. 31 wire size (0.1200 inch decimal diameter) for precise small-diameter hole work
• 135-degree split point is self-centering and reduces thrust on entry
• Web-thinned tapered web reduces cutting resistance and improves chip flow
• 1.625-inch spiral flute length with 4xD ratio supports chip clearance in deeper cuts
• 6-inch overall length provides extended reach into confined areas
• Right-hand cutting direction; compatible with standard drill chucks and collet holders
• Meets NAS 907 Type B standards for aircraft-grade drill bit geometry

Compatibility

Designed as a general-purpose aircraft extension drill bit for use with any standard drill chuck or collet accepting a 0.1200-inch straight cylindrical shank. Meets NAS 907 Type B dimensional and performance standards.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance technicians familiar with proper drilling speeds and feeds for high speed steel tooling. Always secure the workpiece and verify chuck or collet tightness before operation. Use appropriate cutting fluid when drilling steel to manage heat buildup and extend tool life. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is present.