KnKut 5KK9 Carbide-Tipped Hard-Steel Drill Set
KnKut 5KK9 is a carbide-tipped set identified for steel in the 48–65 Rockwell C range. It is a different cutting-material choice from an HSS or cobalt-HSS set; the workpiece hardness and rigidity of the drilling setup should govern selection.
Specifications and included details
- Five carbide-tipped cutting diameters: 1/8, 3/16, 1/4, 5/16 and 3/8 inch.
- 5/16- and 3/8-inch bits are listed at 4-inch length.
- Identified application is steel hardened to 48–65 Rockwell C.
- Drill-press use is recommended in the description; verify any portable-drill application separately.
Before ordering
Confirm the actual material hardness and the bit manufacturer's operating guidance. Plan rigid workholding and appropriate speed, feed and lubrication. Carbide tips do not guarantee successful drilling or broken-extractor removal in every hardened component.
Product questions and answers
Are these solid-carbide bits?
The product is identified as carbide tipped, not solid carbide.
Is HRC a speed setting?
No. Rockwell C is a hardness scale for the workpiece. The stated application range is 48–65 HRC.
What sizes are supplied?
The explicit list gives 1/8, 3/16, 1/4, 5/16 and 3/8 inch, one bit of each size.
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