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High Strength SM Cone Carbide Burr, HRC 50 to 65 Steels
The SM cone built for the hard zone: steels from 50 to 65 HRC, where ordinary burrs skate.
Design and Construction
An SM-coded cone specified for the hard zone: workpieces from 50 to 65 HRC. High-hardness carbide, a reinforced cone profile and a nose that keeps contact where softer heads skate off.
How It Works
On hard steels the cone works point-first with light pressure at reduced speed; the reinforced profile resists the edge collapse that kills ordinary heads on 60 HRC.
Applications
Hardened die repair, tool-steel touch-up, bearing surfaces, hard-facing dressing.
Field Cases
- Die shop: 60 HRC die edges re-cut where files and standard burrs skated.
- Bearing shop: hardened seats dressed without re-machining.
- Hard-facing shop: deposits dressed to profile in single passes.
Performance Data
| Metric | Value / Observation |
|---|---|
| Workpiece range | 50-65 HRC steels |
| Profile | Reinforced cone, high-hardness carbide |
| Speed practice | Reduced ~30-35% vs soft steel |
| Technique | Point-first, light pressure |
Suitable Materials
Hardened steels 50-65 HRC, tool steels, hard-facing deposits.
Material Comparison: Cutting 50-65 HRC: What Works and What Skates
Tool behaviour across the hard zone – typical industry data:
| Tool | On 50-65 HRC | Verdict |
|---|---|---|
| Standard HSS burr | Skates – no cut | Glows and dulls |
| Standard carbide burr | Marginal – edge collapse | Short life |
| This SM high-hardness head | Positive cut, light passes | Engineered duty |
| Speed discipline | Essential at all levels | Non-negotiable |
| Finish on hard steel | Fine – hard steel takes a good finish | Variable |
Delivery Scope
Bit in tube; SM ladder stocked.
Why Choose VPOINT
Specified for the hard zone, not adapted to it.
Precision & Quality Control
Hardness capability verified on test coupons per batch.
Specifications
Hard-zone information:
| Item | Specification |
|---|---|
| Code | SM cone |
| Workpiece | 50-65 HRC |
| Construction | High-hardness carbide |
| Shank | 6 mm (1/4″) |
Frequently Asked Questions
What HRC range?
50 to 65 HRC steels.
Why do ordinary burrs skate?
Their edges collapse on hard surfaces – this profile is reinforced.
Speed?
Reduced about a third versus soft steel.
Die repair?
A core application.
Test coupons?
Capability verified per batch.
Related Search Terms
SM cone carbide burr, HRC 50 burr, hardened steel carbide, high strength cone burr, 60 HRC cutting tool, die repair burr, hard facing dressing, tool steel burr, hard zone carbide, bearing surface burr, SM code burr, 65 HRC rotary file, skate proof burr, hard steel finishing, reinforced cone burr
