Halls TMC3040 High-Speed Steel Step Drill 30--40mm | TMC3040

Halls TMC3040 High-Speed Steel Step Drill Bit (30–40mm) – Multicut Trepanning Action

Halls TMC3040 is a high-speed steel step drill bit designed for cutting clean, round holes in sheet material up to 4mm thick, with a multi-flute trepanning action that helps produce a smooth finish. It’s a practical choice for electricians, fabricators and maintenance teams who need repeatable hole sizes without changing cutters.

The TMC3040 covers a useful 30–40mm range in 1mm increments, making it well suited to common hole sizes used for fittings and installation work. When drilling metals, use a suitable coolant for best results.

Key Features

• Trepanning multi-cut action: Helps produce clean, round holes with a smooth cutting action in sheet materials.
• Wide 30–40mm range: Covers multiple hole diameters in a single bit for fewer tool changes.
• 1mm step increments: Makes it easier to select popular hole sizes with consistent results.
• High-speed steel construction: Built for drilling applications across a broad range of materials.
• Up to 4mm material thickness: Designed for sheet and plate work where controlled enlargement is needed.
• 13mm shank: Fits drill chucks up to 13mm for secure holding during drilling.

Specifications at a glance

Suitable applications

• Enlarging and sizing holes in sheet metal and other sheet materials up to 4mm thick
• Electrical, conduit and general installation work where multiple hole diameters are required
• Automotive and workshop fabrication tasks needing controlled hole sizing