CSJ Crown Drill Bit, 7D Drill Diameter Range 21.00-21.99, Front-Locking Body with Internal Cooling for High-Speed Deep-Hole Drilling, Indexable Insert Drill / Side-Locking Drill Tip

Product Description

CSJ Crown Drill Bit (7D, Ø21.00–21.99 mm)

An industrial-grade, high-performance indexable insert drill designed for high-speed, deep-hole drilling. Featuring a front-locking body with an advanced internal cooling system, this side-locking crown drill bit delivers exceptional chip evacuation, outstanding hole accuracy, and extended tool life in the most demanding machining environments.

Product Introduction

The CSJ 7D Crown Drill Bit represents the pinnacle of deep-hole drilling efficiency. Engineered for modern CNC machining, it utilizes a unique front-locking body design combined with a side-locking crown drill tip to ensure maximum rigidity and quick tip replacement directly on the machine—minimizing downtime.

With its 7D depth capability (drilling depth up to 7 times the diameter) and a versatile Ø21.00–21.99 mm range, it eliminates the need for pilot holes in many standard applications. The integrated internal cooling (through-coolant) system delivers high-pressure coolant directly to the cutting edge, rapidly lowering temperatures and forcing chips out of deep holes to prevent binding and tool breakage.

Product Parameters

Product Functions (How It Works & Benefits)

• High-Speed Deep Hole Drilling (7D): Effortlessly drills deep holes up to 7x diameter with superior straightness and surface finish, bypassing the need for peck-drilling cycles.

• Optimal Thermal Control: Dual internal coolant channels channel high-pressure fluid straight to the cutting point, dramatically reducing heat buildup and extending tool life.

• Rapid Tip Replacement (Front & Side Locking): The innovative front-locking body paired with a secure side-lock tip allows operators to swap worn crown tips quickly without removing the entire holder from the machine spindle.

• Superior Chip Evacuation: Optimized flute geometry combined with through-coolant pressure ensures that metal chips are broken efficiently and flushed out instantly, preventing clogging.

Application Scenarios

The CSJ Crown Drill is highly versatile and built to handle heavy-duty tasks across various industries:

• Heavy Machinery Manufacturing: Perfect for drilling deep, precise structural holes in large components, frames, and gearboxes.

• Automotive & Aerospace Sector: Ideal for machining engine blocks, crankshafts, landing gear components, and tough alloy brackets.

• Oil & Gas Industry: Heavily used for boring out manifolds, valves, and high-strength alloy piping joints where depth and precision are critical.

• Mold & Die Production: Excellent for drilling deep ejector pin holes and water cooling lines in massive injection molds.