Precision Twist Drill 5996532 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996532 is a cobalt screw machine length drill bit designed for drilling into hard and abrasive materials where standard high-speed steel bits fall short. Sized at 0.358 inches (Letter T) in diameter with a 135-degree split point, it delivers fast starts without a center punch and reduces thrust when drilling tough stock. The M42 cobalt alloy construction resists heat buildup, making it a reliable choice for professionals who push bits hard in production or maintenance environments. It is right-hand cut with a regular spiral flute and a straight-cylindrical shank, ready for use in standard drill chucks and screw machine setups.

This bit is built for machinists, maintenance technicians, and metalworking tradespeople working with hard ferrous and non-ferrous materials. The screw machine length format — shorter than jobber length — provides added rigidity and reduced deflection in turret lathes, screw machines, and drill presses. It suits production drilling applications where repeatability and bit life in hard stock are priorities. The 2.5xD flute-to-diameter ratio supports chip evacuation in short, controlled cuts.

Key Features

• M42 cobalt alloy construction handles hard and abrasive workpiece materials
• 135-degree split point starts on contact without center punching and reduces axial thrust
• Web-thinned, tapered web configuration improves cutting efficiency and chip clearance
• Screw machine length body adds rigidity and limits deflection compared to jobber-length bits
• Right-hand spiral flute with 2.5xD flute ratio supports chip evacuation in short-stroke drilling
• Straight-cylindrical shank fits standard three-jaw drill chucks and collet holders

Compatibility

Designed as an OEM-style screw machine length cobalt drill bit for use in drill presses, turret lathes, CNC screw machines, and hand-held drilling equipment accepting a straight-cylindrical shank.

Installation Notes

Installation and use should be performed by a qualified machinist or maintenance technician familiar with metalworking equipment and safe drilling practices. Secure the workpiece before operation and confirm the chuck or collet is properly tightened to prevent shank slippage. Avoid running cobalt bits dry on hard materials — use appropriate cutting fluid to extend bit life and prevent heat damage to the cutting edge. Inspect the split point for damage before each use; a chipped or deformed point will affect hole location accuracy and increase thrust.