Hertel 74129297 Straight-flute Drill Bit 11/32 in Carbide

Product Description

The HERTEL 74129297 is a straight-flute, solid carbide drill bit designed for precision hole-making in hard and abrasion-resistant workpiece materials. It measures 11/32 inches (0.3438 inches decimal) in diameter and features a 140-degree notched point geometry that reduces thrust and improves centering on entry. The web-thinned design lowers cutting resistance on difficult materials. Right-hand cutting direction is standard. Bright/uncoated finish maintains the as-ground carbide edge without additional coating layers. Machinist and tool crib personnel are the primary users. Diameter tolerance is held to +0.0000 to -0.0005 inches for close-tolerance work.

This bit is engineered for drilling chrome alloy, heat-treated alloy, nickel alloy, stainless steel, carbon steel, and titanium alloy. The 140-degree notched point and web thinning make it particularly well-suited for stainless and high-nickel alloys where conventional geometry drills tend to work-harden the material and walk on entry. The C2 carbide grade balances hardness and toughness for a broad range of ferrous and exotic-metal applications in production machining and maintenance environments.

Key Features

• Solid carbide construction, C2 material grade, for drilling hard and abrasion-resistant metals
• 140-degree notched point reduces thrust and improves self-centering on entry
• Web-thinned flute design lowers cutting resistance in tough alloys
• Bright/uncoated finish preserves as-ground edge geometry
• Right-hand cutting direction; 2-flute configuration for chip clearance
• Diameter tolerance of +0.0000 to -0.0005 inches supports close-tolerance hole requirements

Compatibility

Designed for use in standard drill chucks and CNC machining centers accepting an 11/32-inch straight shank. Suitable for primary and secondary drilling operations in chrome alloy, heat-treated alloy, nickel alloy, stainless steel, steel, and titanium alloy workpieces.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance professionals familiar with carbide tooling. Secure the shank fully in the chuck or collet before operation and verify runout before cutting. Carbide is brittle - avoid interrupted cuts or side-loading that can chip the cutting edge. Ensure the machine spindle is stopped completely before changing or inspecting the bit.