RUKO STB-HSSCo-4,0-12,0mm stappenboor HSS-Co 4-12 mm

Step drill bit made of HSS-Co (high-speed steel with 5% cobalt) for drilling, deburring and chamfering in sheet metal up to 4 mm thickness. Diameter range 4–12 mm in 1 mm increments, 9 steps, self-centering point, straight flute, bright finish. Suitable for stainless steel, steel, non-ferrous metals, plastics and sheet metal. Cooling lubricant recommended.

Advantages

HSS-Co with 5% cobalt for high wear resistance and heat resistance. Self-centering point enables precise drilling without center punch. 9 steps from 4 to 12 mm cover common hole sizes in one tool. Straight flute design for efficient chip removal in sheet metal.

Suitable for

• Stainless steel
• Steel
• Non-ferrous metals
• Plastics
• Sheet metal up to 4 mm thickness

Key specifications

• Drill bit type: Step drill bit
• Material: HSS-Co (5% cobalt)
• Diameter range: 4–12 mm
• Step increments: 1 mm
• Number of steps: 9
• Shank type: Cylindrical
• Shank diameter: 6 mm
• Total length: 66.5 mm
• Cutting length: 30 mm
• Point angle: 118°
• Flute type: Straight flute
• Surface finish: Bright (uncoated)
• Standard: DIN 1412 C
• Recommended material thickness per step: up to 4 mm
• Self-centering point: Yes

Recommendations

Use cooling lubricant for optimal performance and longer tool life. Ideal for sheet metal work where multiple hole sizes are required without changing bits.