Step Spiral Groove Conical Cone Drill 4-32mm HSS Bit Set with TiN Coating

Brief Overview

This is a precision-engineered step drill set designed for professional workshops and manufacturing environments where versatility and durability are non-negotiable. The 4-32mm range covers the most frequently required hole sizes, eliminating the need for multiple single-diameter drill bits. The gold titanium nitride (TiN) coating visible in the stepped profile provides enhanced wear resistance and heat management. If you're stocking essentials for general-purpose drilling, consider pairing this with specialized weld drill bits for targeted applications.

Key Features

• 4-32mm Stepped Range: Sequential hole enlargement in a single tool eliminates tool changes and reduces setup time
• Dual Relief Angle Design: First relief angle optimizes positive cutting action; second relief angle provides clearance space and cooling channel, preventing heat buildup and extending tool life
• Spiral/Stepped Grooves: Enhanced chip evacuation on each stepped tier reduces friction and improves surface finish
• TiN-Coated HSS Body: Gold-colored titanium nitride coating provides superior hardness, heat resistance, and corrosion protection compared to uncoated HSS
• Hex Shank Design: Compatible with standard drill chucks for secure, reliable grip and minimal runout
• Engraved Size Markings: Clear millimeter increments along the cone face for quick identification and setup
• Low-Heat Operation: Optimized relief angles and coating work together to minimize thermal buildup during continuous drilling

Why Resellers Choose This Tool

Inventory Efficiency: One step drill eliminates the need to stock 29 individual bits (4mm through 32mm). You reduce shelf space, simplify picking, and improve cash flow.

Customer Retention: Professionals appreciate tools that reduce setup time and tool changes. A single step drill that performs consistently builds confidence in your catalog and drives repeat orders.

Margin Opportunity: Step drills command higher per-unit margins than commodity single-diameter bits, while offering genuinely better value to your end customers. This positions you as a supplier of smart solutions, not just cheap consumables.

Durability Story: The dual relief angle design and TiN coating extend tool life significantly compared to standard spiral flutes. Your customers will notice reduced bit breakage and longer intervals between replacement—they'll return to you for the next set.

Technical Specifications

Specification	Detail
Size Range	4–32mm (stepped increments)
Tip Style	Pointed conical (for sheet metal, thin plate, composite)
Material	High Speed Steel (HSS) body
Coating	Titanium Nitride (TiN) – gold finish
Shank Type	Hex-flattened for standard drill chuck
Flute Design	Spiral grooves on each stepped tier
Relief Angle	Dual-angle design (cutting + cooling/clearance)
Heat Dissipation	Optimized groove geometry for low-temperature operation
Primary Applications	Sheet metal, thin aluminum, composites, electronics assembly, stainless steel

Real-World Performance Context

This tool performs best on softer to medium-hardness materials where the conical profile and spiral grooves can evacuate chips efficiently. Sheet metal shops, HVAC fabricators, and electronics manufacturers will see immediate productivity gains. The stepped design is particularly valuable in high-volume drilling operations where bit changes represent dead time.

For hardened or cast materials, or where through-hole drilling in thick stock is the primary need, consider complementing your inventory with alternative step drill configurations for specialized applications.

Bottom Line for Your Business

A professional step drill set fills a critical gap in every shop's toolkit. The 4-32mm range covers 95% of common hole-enlargement tasks, the TiN coating ensures longer life than budget alternatives, and the dual relief angle design validates a legitimate performance advantage you can communicate to your customers. Stock this, and you're not just selling a tool—you're selling reduced downtime and better margins for your end users.