Description
Overview:
The Timco Step Drill Bit 4-20 mm is a high-speed steel (HSS) bit designed for precise drilling, hole enlargement, and de-burring in thin sheet materials. Its stepped cone profile lets you create multiple hole sizes with one bit, delivering clean, round results and a smooth finish. Suitable for use in standard cordless or corded drills and drill presses, it performs best on thin sheet metal up to 4 mm (0.16 in) thick. The HSS construction offers durability and reliable cutting performance under continuous use. Ideal for automotive work, HVAC ducting, electrical enclosures, and general fabrication, this bit covers common hole sizes from 4 mm to 20 mm (0.16-0.79 in) without frequent tool changes, helping you work accurately and efficiently on site or in the workshop.
Key Features:
- HSS construction for strength, edge retention, and long service life
- Step range from 4 mm to 20 mm (0.16-0.79 in) for versatile hole sizing with one bit
- Effective on thin sheet up to 4 mm (0.16 in), ideal for mild steel, aluminium, brass, copper, and plastics
- Drills, enlarges, and de-burrs in a single pass to reduce extra finishing
- Precision step geometry promotes smooth cutting and round, clean holes
- Works with standard variable-speed drills and drill presses for controlled cutting
- Best results with cutting lubricant to manage heat and extend tool life
- Useful for creating pilot holes for fixings, glands, grommets, and switches
- Clear step progression helps achieve repeatable sizes across multiple holes
- Suitable for on-site work thanks to compact form and minimal tool changes
Typical Applications:
Creating and enlarging holes in body panels, brackets, cable trays, and electrical or HVAC enclosures; fitting grommets, conduit glands, and switches; trimming and de-burring sharp edges on roofing sheets and cladding; workshop fabrication in mild steel and non-ferrous sheets up to 4 mm (0.16 in); general repair tasks in automotive, agricultural, and building services where multiple hole sizes are required.
Also known as:
Step bit, cone drill, unibit, progressive step drill, taper step bit, ladder drill bit, pyramid drill, hole enlarger bit, sheet metal step cutter.
Product Specifications
| L&S Part No. | 902 0746 |
|---|---|
| Manufacturer | Timco |
| OEM No. | SD420 |
| Unit of Sale | 1 |
| Machine Type | Handheld Construction Tools |
| Key Features | - HSS construction for durability and edge retention - Step range from 4 mm to 20 mm - Effective on thin sheet up to 4 mm thick - Drills, enlarges, and de-burrs in one pass - Compatible with standard drills and drill presses |
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