What the certificate contains
- Part/lot details and the process performed.
- Hardness results (HRC/HV/HB) against the required limits.
- Coating thickness and/or salt-spray results, if applicable.
- Date, instrument and inspector.
How to read the values
Check whether each reading sits within the specified range—e.g. spec 58–60 HRC, measured 59 = pass.
Check the number of points/samples taken and that the units match what was agreed.
Why it matters
It is traceable quality evidence for QC, audits or passing on to your end customer.
Automotive/export work usually mandates this document.
FAQ
Can I get a certificate?+
Yes—tell us the values you need (hardness/thickness/salt spray) and we issue results with the job.
Must the reading hit an exact value?+
No single value—it must fall inside the agreed range, e.g. 58–60 HRC.
Who certifies the test?+
Our lab uses calibrated instruments and issues results under the company; we can also coordinate an accredited external lab if required.
Free Engineering Tools
- Hardness Converter HRC ↔ HV ↔ HB
- Which Steel Grades Harden — and How Far
- Fastener Weight: pcs ↔ kg
- Finishing Specification Builder for Purchasing and QC
- Salt Spray Test Plan Builder
- Coating thickness → thread fit (GO/NO-GO)
- Hydrogen Embrittlement — is baking required?
- Bolt Tightening Torque & Proof Load
- Thread Engagement Length
- Bolt Size Estimator (from load)
- Bolt Property Class — Mechanical Properties (ISO 898-1)
Related comparison guides
- Zinc plating vs Dacromet / zinc flakeZinc plating vs Dacromet: which coating for screws and bolts?
- Grade 8.8 vs Grade 10.9 vs Grade 12.9Grade 8.8 vs 10.9 vs 12.9 bolts: what actually differs?
- Class 10.9 vs Class 12.9Class 10.9 vs 12.9: what you gain, and what you take on
- Electroplated zinc vs Hot-dip galvanizingZinc plating vs hot-dip galvanizing: which one does your fastener need?
Technical content review
Reviewed by the V.S. Heat Treatment QA and production team—heat-treatment and finishing operations since 1994 under an ISO 9001:2015 quality system.
View evidence and report format
