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Rockwell–Rockwell Superficial–Brinell–Vickers–Shore Hardness Conversion Chart
Here’s a Rockwell–Rockwell Superficial–Brinell–Vickers–Shore hardness conversion chart covering all requested scales and indenters, optimized for mold manufacturing applications
Rockwell Hardness Conversion |
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| Hardness Scale | Symbol | Indenter Type | Load | Typical Range | Equivalent Standards | Best for Materials |
| • Rockwell A | HRA | 120° diamond cone (Brale) | 60 kgf | 70-95 HRA | ISO 6508, ASTM E18 | Tungsten carbide, thin case hardening |
| • Rockwell B | HRB | 1/16″ (1.588mm) steel ball | 100 kgf | 40-100 HRB | ISO 6508, ASTM E18 | Annealed steels, aluminum alloys |
| • Rockwell C | HRC | 120° diamond cone (Brale) | 150 kgf | 20-70 HRC | ISO 6508, ASTM E18 | Hardened tool steels (P20, H13) |
| • Rockwell D | HRD | 120° diamond cone (Brale) | 100 kgf | 40-80 HRD | ISO 6508, ASTM E18 | Thin hard coatings |
| • Rockwell E | HRE | 1/8″ (3.175mm) steel ball | 100 kgf | 70-100 HRE | ISO 6508, ASTM E18 | Soft metals (copper, brass) |
| • Rockwell F | HRF | 1/16″ (1.588mm) steel ball | 60 kgf | 60-100 HRF | ISO 6508, ASTM E18 | Annealed non-ferrous alloys |
Rockwell Superficial Hardness Conversion |
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| • 15-N | HR15N | 120° diamond cone (Brale) | 15 kgf | 70-94 HR15N | ASTM E18 | Nitrided surfaces, thin sections |
| • 30-N | HR30N | 120° diamond cone (Brale) | 30 kgf | 40-90 HR30N | ASTM E18 | Case-hardened layers |
| • 45-N | HR45N | 120° diamond cone (Brale) | 45 kgf | 20-80 HR45N | ASTM E18 | Medium-depth hardened zones |
| • 30-T | HR30T | 1/16″ (1.588mm) steel ball | 30 kgf | 40-80 HR30T | ASTM E18 | Zinc alloys, soft steels |
Brinell Hardness Conversion |
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| • Standard | HB | 10mm tungsten carbide ball | 3000 kgf | 100-650 HB | ISO 6506, ASTM E10 | Mold bases, ductile metals |
| • Light Load | HB | 10mm steel ball | 500 kgf | 30-200 HB | ISO 6506, ASTM E10 | Soft metals (aluminum, copper) |
| Vickers | HV | 136° diamond pyramid | 1-120 kgf | 50-3000 HV | ISO 6507, ASTM E384 | Micro-hardness, coatings |
Shore Hardness Conversion |
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| • Shore D | HS D | Spring-loaded cone | N/A | 50-90 HS D | ISO 868, ASTM D2240 | Rigid plastics, polyurethane |
| • Shore C | HS C | Spring-loaded cone | N/A | 20-90 HS C | ISO 7619 | Elastomers, soft rubbers |
| Scleroscope | HS | Diamond-tipped hammer | Dynamic rebound | 20-140 HS | ASTM A956 | Large mold components (field testing) |
Cross-Conversion Reference (Selected Values) |
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| HRC | HRA | HRB | HB (3000kg) | HV | HR15N | HSD |
| 20 | 60.1 | – | 226 | 238 | 40.5 | 80 |
| 30 | 68.5 | – | 286 | 302 | 53.2 | 85 |
| 40 | 73.8 | – | 372 | 392 | 63.8 | 88 |
| 50 | 79.2 | – | 490 | 513 | 74.5 | 92 |
| 60 | 85 | – | 634 | 697 | 88 | 95 |
| – | – | 60 | 109 | 115 | – | 65 |
| – | – | 90 | 160 | 85 | – | 75 |
Mold Industry Application Guide
Core/Cavity Inserts:
- HRC 48-52 (H13/S7) ≈ HV 500-550
- Test Method: Rockwell C (150kg Brale)
Mold Bases:
- HB 300-350 (P20/4140) ≈ HRC 32-36
- Test Method: Brinell (3000kg, 10mm ball)
Surface Treatments:
- Nitrided layers: HR15N 80-90 ≈ HV 900-1200
- Chrome plating: HV 800-1000
Soft Components:
- Ejector pins (annealed): HRB 85-95
- Aluminum frames: HB 80-120
Testing Method Selection Criteria |
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| Feature Size | Recommended Method | Indenter | Load |
| >10mm thickness | Brinell | 10mm carbide ball | 3000 kgf |
| 1-10mm | Rockwell C | 120° diamond cone | 150 kgf |
| 0.1-1mm | Vickers | Diamond pyramid | 10-50 kgf |
| Coatings <0.1mm | Rockwell Superficial | 120° diamond cone | 15-45 kgf |
| Elastomers | Shore C/D | Spring-loaded cone | N/A |
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