Vickers Hardness Testing Standards for Precision Key Blank Nickel Silver Alloys
Engineering Overview: Quality control guide on ISO 6507 micro-Vickers hardness testing (HV1) for nickel-silver key blanks, ensuring exact bitting edge retention.
Technical & Engineering Specifications
| Material | CuNi18Zn20 Grade 1 Commercial Nickel-Silver |
|---|---|
| Test Load | HV1 (1.0 kgf Diamond Indenter) |
| Target Spec | 175 HV1 +/- 10 HV1 |
| Testing Standard | ISO 6507-1 / ASTM E384 Micro-Vickers Hardness |
Key Blank Hardness Quality Control
Key blanks that are too soft wear down quickly; keys that are too hard chip CNC cutting wheels. Quality standards mandate ISO 6507 Micro-Vickers Hardness Testing (HV1).
Hardness Benchmarks
- Target Range: 170 to 190 HV1 for 18% nickel-silver key blanks.
- Testing: A diamond pyramid indenter applies $1.0 ext{ kgf}$ load, verifying consistent cold-rolled hardness across blade cross-sections.
Frequently Asked Engineering & Selection Questions
Q1: What is the ideal Vickers hardness for a commercial key blank?
170 to 190 HV1, providing the perfect balance between high wear resistance and smooth CNC cutting.