HSS-Co M35 Spot Weld Drill Bits – Center Point, 6/8/10mm, for Automotive Body Repair & Panel Separation

Specification:
Material: HSS-Co M35 (5% Cobalt)
Center Point: Yes (self-centering pilot tip)
Cutting Diameter: 6mm / 8mm / 10mm
Manufacturing: 100% Full Ground Surface
Finish: Bright (Uncoated) / Amber Color / Black Oxide
Shank Type: Straight Shank
Application: Spot weld removal on automotive body panels; suitable for door skins, fenders, rocker panels, and rear panels without penetrating the lower sheet

Send email to us

Product Detail

Product Tags

Introduction

★ What Is a Spot Weld Drill Bit?

A spot weld drill bit is a specialized cutting tool designed for automotive body repair. In vehicle manufacturing, body panels such as door skins, fenders, rocker panels, and rear panels are joined together through spot welding. During repair or replacement, these panels need to be separated — but a standard twist drill will easily punch through both layers of sheet metal, causing unnecessary damage to the panel underneath.

The spot weld drill bit is built for one purpose: remove the weld nugget cleanly, without penetrating the lower panel.

A center pilot tip locks onto the weld spot and prevents the bit from wandering. The specially designed cutting geometry removes only the metal within the weld zone, naturally stopping at the interface between the two panels and leaving the lower sheet intact.

★ How Is It Different from a Standard Twist Drill?

A standard twist drill has no self-centering function — it tends to slip across the weld surface and penetrates aggressively, making it easy to drill through both panels at once. The spot weld drill bit's cutting geometry is engineered specifically for weld nugget metal, allowing even non-specialist technicians to remove spot welds cleanly and efficiently.

★ Why M35 Cobalt HSS?

The metal in a spot weld zone has been melted and rapidly cooled, leaving it significantly harder than the surrounding base material. This places higher demands on a drill bit's heat resistance and wear resistance.

M35 (HSS-Co, 5% Cobalt) offers clear advantages over standard M2 high-speed steel:

• Higher red hardness — maintains cutting edge integrity at elevated temperatures, extending tool life
• Superior wear resistance — stays sharp through hardened weld nugget material
• Handles interrupted cutting — the start-stop nature of panel repair work demands toughness; M35 absorbs the impact

For professional bodyshops that rely on spot weld removal day in, day out, M35 is the most cost-effective material choice.

★ Common Sizes & Applications