Micro 100 SPD-312-120 Spotting Drill 5/16 in Solid Carbide

Product Description

The MICRO 100 SPD-312-120 is a solid carbide spotting drill designed to create accurate center points and chamfers before through-hole drilling operations. With a 120-degree point angle, it matches the geometry of most standard twist drills, reducing walking and improving hole location accuracy. The 5/16-inch cutting diameter and straight cylindrical shank make it compatible with standard drill chucks and collet systems. At 2.5 inches overall length, it fits short-reach setups on CNC machining centers, drill presses, and manual mills. Machinists and tooling technicians install this drill in production and job-shop environments where positional accuracy is critical before finish drilling.

The SPD-312-120 suits general-purpose spotting operations in metals, plastics, and composites. Its 0.75-inch flute length is optimized for shallow spotting passes rather than deep-hole work. The right-hand cutting direction and two-flute spiral geometry support clean chip evacuation in typical spotting depths. It is well suited for CNC machining centers running high-RPM programs where a consistent entry point is required before switching to a finishing or step drill.

Key Features

• 120-degree point angle matches standard twist drill geometry for accurate pre-drill spotting
• Solid carbide construction provides rigidity and wear resistance in metalworking applications
• Bright/uncoated finish suitable for general-purpose use across a range of workpiece materials
• Two-flute spiral design promotes chip evacuation during spotting passes
• Straight cylindrical shank fits standard drill chucks and ER collets without modification
• Single-ended tool with 0.75-inch flute length optimized for shallow spotting depths

Compatibility

Designed as a general-purpose spotting drill compatible with standard drill chucks, ER collet holders, and hydraulic toolholders accepting a 5/16-inch straight cylindrical shank on CNC machining centers, knee mills, and drill presses.

Installation Notes

A licensed machinist or tooling technician should install and operate this drill. Power down the spindle and confirm the machine is in a safe, locked-out state before changing tooling. Secure the shank fully within the collet or chuck to the recommended grip depth before tightening. Follow the machine manufacturer and toolholder manufacturer guidelines for runout tolerances and clamping torque to prevent tool pullout during cutting.