Step drill bit MODECO MN-61-801 cylindrical stepped 7–12 mm (steps: 7 4 5 6 10 11 12 8 9)

MODECO MN-61-801 cylindrical stepped drill bit delivers a range of hole diameters in a single tool, enabling progressive drilling and enlargement of holes in sheet materials. The stepped geometry covers diameters from approximately 7 to 12 mm across multiple increments, allowing controlled advancement through metal, plastic and other thin materials. The tool is intended for use in standard drill chucks and is suitable for tasks that require drilling, deburring and enlarging existing holes without changing bits.

Advantages

The cylindrical stepped design reduces the need to switch between multiple twist drills by offering several diameters in one bit, which saves time and simplifies workflow. The stepped profile supports progressive chip removal and more controlled cutting when enlarging holes, while the single-piece construction improves concentricity and stability in standard chucks. Compatibility with thin sheet materials and plastics allows for versatile use in workshops and maintenance tasks.

Suitable for

• Drilling and enlarging holes in thin metal sheets and panels
• Deburring and finishing pre-drilled holes
• Working with plastics, laminates and thin composite sheets
• Workshop repairs, HVAC, automotive sheet metal tasks and maintenance work

Key specifications

• Type: cylindrical stepped (step drill) bit
• Working diameter range: approximately 7 mm to 12 mm across multiple steps
• Step sizes (sequence): 7, 4, 5, 6, 10, 11, 12, 8, 9 (stepped increments provided by the bit)
• Material application: suitable for thin metals, plastics and similar sheet materials
• Mounting: designed for standard drill chucks

How to use

Secure the stepped drill bit in a standard drill chuck, ensuring it is properly tightened and concentric. Mark the desired hole position and, if needed, start with a small pilot point or center punch to prevent walking. Begin drilling at low to moderate speed and apply steady, even pressure to allow each step to cut progressively; increase speed cautiously when cutting softer materials like plastics. Withdraw the bit periodically to clear chips and inspect the hole. For enlarging an existing hole, align the current opening on the appropriate step and advance until the desired diameter is reached. Use appropriate cutting fluid or lubrication when drilling metals to extend tool life and improve surface finish.

Использование — рекомендации

The stepped bit is designed for progressive drilling in thin materials; to achieve cleaner edges and extend tool life, use light cutting oil for metals, moderate speeds, and intermittent clearing of chips. Avoid heavy axial force and high speeds on thin sheets to prevent deformation.