Irwin 4-5/8″ Carded Cobalt 135 Degree Jobber Drill Bit (3016021)

Description

The Irwin 4-5/8″ Carded Cobalt 135 Degree Jobber Drill Bit (3016021) is a specialized tool engineered for the most demanding metal drilling applications. Made with a premium cobalt composition, this drill bit is built to withstand extreme heat and friction, making it the ideal choice for working on tough and abrasive materials. Its heavy-duty construction and design features are aimed at providing superior performance and a longer tool life compared to standard drill bits. The bit’s 135° split-point tip is a critical feature that enables it to start drilling on contact, preventing the bit from “walking” or slipping on the surface. This ensures accurate and clean hole placement every time, eliminating the need for a center punch. This individual carded bit is a reliable addition to any professional’s toolkit for jobs involving hardened steel, stainless steel, cast iron, and other challenging alloys.

KEY FEATURES AND BENEFITS:

• Cobalt Construction for Longevity: Engineered with a cobalt composition, this drill bit offers high resistance to heat and abrasion. This allows the bit to maintain its sharpness and structural integrity even when drilling through high-temperature materials, significantly extending its working life.
• Precision and Immediate Starting: The 135° split-point tip is designed to engage the workpiece instantly. This self-centering feature eliminates bit walking, ensuring precise hole placement and a clean start without the need for a separate pilot hole or center punch.
• Versatile and Heavy-Duty Performance: This drill bit is specifically designed for tough metal drilling. Its robust construction makes it suitable for a wide range of abrasive alloys, including heat-treated hardened steel, stainless steel, and cast iron, making it a highly versatile tool for demanding professional tasks.

SPECIFICATIONS:

• Model Number: 3016021
• Drill Bit Type: Jobber Length
• Shank Type: Straight
• Point Angle: 135 degrees
• Point Type: Split Point
• Overall Length: 4-5/8 inches
• Cutting Direction: Right-hand
• Material: Cobalt High-Speed Steel (M-35)
• Finish: Bright

HOW TO USE:

1. Preparation: Always wear appropriate personal protective equipment, including safety glasses. Secure the workpiece firmly in a vise or with clamps to prevent it from moving during drilling.
2. Installation: Insert the straight shank of the drill bit into your drill chuck. Tighten the chuck securely to ensure the bit is centered and will not slip.
3. Positioning: Place the tip of the bit on the desired location for the hole. The 135° split-point tip will self-center, so a pilot hole is not necessary.
4. Drilling: Begin drilling at a consistent, moderate speed. Apply steady, firm pressure to the drill. For hard metals, it is crucial to use a cutting fluid or lubricant to dissipate heat and improve cutting performance.
5. Finishing: Once the hole is drilled, retract the bit while the drill is still spinning to clear chips. Remove the bit from the chuck and clean it before storing.

BENEFITS OF USING IRWIN 4-5/8″ CARDED COBALT 135 DEGREE JOBBER DRILL BIT (3016021):

• Superior tool life and performance when drilling into tough, heat-treated, and abrasive metals.
• Reduces drilling time and effort due to the aggressive 135° point and self-centering design.
• Eliminates the need for a pilot hole or center punch, streamlining the drilling process.
• Provides accurate, clean, and professional-grade holes consistently.
• Handles high-temperature applications without losing its cutting edge or structural integrity.

FEATURES:

• Individually packaged in carded form for quick identification and accessibility.
• Spiral flute design efficiently removes chips and debris during drilling.
• Reinforced web structure for added strength and durability.
• Crafted from M-35 cobalt steel with 5% cobalt content for enhanced heat resistance and performance.
• Standard jobber length suitable for various general-purpose metal drilling tasks.