Hertel 61699724 Screw Machine Drill Bit Size 29 Hss

Product Description

The HERTEL 61699724 is a screw machine length drill bit designed for general-purpose drilling in metal, plastic, and similar materials. Built from high-speed steel with an oxide finish, it runs at a wire gauge size 29, which equals 0.1360 inches in decimal. The 118-degree standard point angle suits a wide range of materials and is the most common geometry stocked by machinists and maintenance techs. At 1-15/16 inches overall length, the shortened flute-to-shank ratio improves rigidity and reduces deflection in drill press and CNC turret applications. A licensed machinist, tool-and-die tech, or maintenance professional typically installs and uses this bit.

Screw machine length bits are specified when stub-length rigidity is needed without going to a jobber length. This bit fits drill presses, CNC turret lathes, screw machines, and bench-top drilling setups where short, stiff tooling reduces runout. The 3xD flute-to-diameter ratio keeps the flute length at 15/16 inches, limiting chip packing in shallow-hole operations. Typical applications include production drilling of pilot holes, clearance holes, and through-holes in light-gauge ferrous and non-ferrous stock. The right-hand cutting direction and spiral flute geometry are standard for conventional drilling operations.

Key Features

• Wire gauge size 29 (0.1360 inches decimal) for precise hole sizing
• 118-degree standard point angle suits general-purpose drilling in metal and plastic
• High-speed steel construction with oxide coating for surface protection and lubricity
• Screw machine (stub) length at 1-15/16 inches OAL improves rigidity over jobber-length bits
• 3xD flute ratio with 15/16 inch flute length reduces chip packing in shallow holes
• Straight-cylindrical shank fits standard drill chucks and collets without modification

Compatibility

Designed as a general-purpose screw machine length drill bit conforming to ANSI specification, compatible with standard drill presses, CNC turret lathes, and screw machines accepting a straight-cylindrical shank in the 0.1000 to 0.1500 inch drill bit size range.

Installation Notes

Secure the straight-cylindrical shank firmly in a keyed or keyless drill chuck before use and verify runout is within acceptable limits for the application. Power down and de-energize any machine tool completely before changing tooling. Inspect the cutting edges for chips or wear before each use, as a damaged point on a small-diameter bit can cause wandering and oversize holes. Follow applicable OSHA machine guarding and PPE requirements for drilling operations.