SJ62521 – 21mm 60° Countersink Burr, 6mm Shank Single Cut for Steel & Cast Iron

The SJ62521 is a 60° countersink carbide burr with a 21mm head and 6mm shank, built for chamfering, deburring, and countersinking in heavy-duty materials. The single-cut fluting delivers smooth control and a clean finish—ideal for prepping holes, breaking edges, or cleaning up after drilling in steel, stainless, and cast iron.

Whether you're chasing a clean seat for a fastener or knocking off a burr that doesn’t belong, this burr gives you precision without compromise.

Specs:

• Shape: 60° Countersink (Type J)
• Head diameter: 21mm
• Cut length: 21mm
• Shank: 6mm
• Overall length: 70mm
• Cut type: Single cut
• Material: Brazed solid carbide

Recommended RPM: 6,000–12,000 depending on material.