Cleveland C73431 Jobber Drill Bit No. 3 Hss 118 Split Point

Product Description

The CLEVELAND C73431 is a No. 3 wire-size jobber-length drill bit machined from high speed steel and designed for accurate, clean hole-making in metal and non-ferrous materials. The bit measures 0.2130 inches in diameter and carries a 118-degree split point that reduces walking and allows immediate bite on contact with the workpiece surface. A bright, uncoated finish preserves the base steel hardness without added coating thickness. At 3.75 inches overall length with a 2.5-inch flute, this is a standard jobber proportion suited to hand-held drilling, drill presses, and CNC turret operations where short-to-medium reach is needed.

This bit is rated as a heavy-duty grade tool and conforms to NAS 907 Type A standards, making it appropriate for aerospace, industrial maintenance, and production environments. Primary workpiece material is aluminum, though the HSS construction handles brass, plastics, and mild steel as well. The straight-cylindrical shank at 0.2130 inches diameter fits standard three-jaw chucks without adapters. The tapered web with web-thinning reduces thrust load during drilling, which is especially useful in thicker aluminum stock or layered sheet assemblies. A licensed trades machinist or industrial maintenance technician is the typical end user.

Key Features

• No. 3 wire size — 0.2130-inch diameter with a tight tolerance of -0.0007 to 0.0000 inches for precise hole sizing
• 118-degree split point reduces drill walk and lowers required feed pressure
• Web-thinned, tapered web construction reduces axial thrust on the spindle and workpiece
• High speed steel construction — heavy-duty grade rated for demanding production cycles
• Bright uncoated finish maintains full base steel hardness with no coating buildup at cutting edges
• Conforms to NAS 907 Type A specification for dimensional and performance consistency

Compatibility

Designed as a standard jobber-length replacement drill bit for any application requiring a No. 3 wire-size hole (0.2130 inches). Fits any drill press, hand drill, or CNC turret equipped with a chuck accepting a 0.2130-inch straight-cylindrical shank. Primary listed workpiece material is aluminum per supplier data.

Installation Notes

A licensed machinist or qualified maintenance technician should verify chuck condition and concentricity before seating the bit. Secure the straight-cylindrical shank fully in the chuck jaws and tighten evenly to prevent runout. Confirm spindle speed is appropriate for the workpiece material and bit diameter before initiating a cut — excessive speed on aluminum can cause edge buildup. Inspect the split point for chipping or wear before each use and replace the bit if cutting edges show deformation.