Math & Numbers

Hardness Converter (HB / HV / HRC / HRB)

Convert between Brinell (HB), Vickers (HV), and Rockwell (HRC / HRB) hardness via ASTM E140 tabulated data with linear interpolation. Three material classes: carbon/alloy steel (HV 100–960), austenitic stainless (HV 100–600), and cartridge brass (HV 40–200). Any input scale produces all the others; a scale that does not apply in the current hardness band returns 'out of range'. Indicative only — not for acceptance testing per ASTM E140.

json· JSON resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/hardness-converter' \
  -H 'Content-Type: application/json' \
  -d '{"material":"steel","inputScale":"HV","value":200,"decimalPlaces":1}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/hardness-converter

Parameters

Name	Type	Required	Description
material	select	No	Material class — ASTM E140 provides separate conversion tables per material because hardness depends on work-hardening behaviour.
inputScale	select	No	—
value	number	Yes	Hardness value in the selected Input Scale. Must lie within the tabulated ASTM E140 range for the chosen material.
decimalPlaces	number	No	—

Response format

JSON result

JSON

{
  "key": {...},
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-hardness-converter": {
      "name": "hardness-converter",
      "description": "Convert between Brinell (HB), Vickers (HV), and Rockwell (HRC / HRB) hardness via ASTM E140 tabulated data with linear interpolation. Three material classes: carbon/alloy steel (HV 100–960), austenitic stainless (HV 100–600), and cartridge brass (HV 40–200). Any input scale produces all the others; a scale that does not apply in the current hardness band returns 'out of range'. Indicative only — not for acceptance testing per ASTM E140.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=hardness-converter",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "hardness-converter",
    "arguments": {
  "material": "steel",
  "inputScale": "HV",
  "value": 200,
  "decimalPlaces": 1
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

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Hardness Converter (HB / HV / HRC / HRB)

json· JSON resultOpen tool

Name

Type

Required

Description

material

select

Material class — ASTM E140 provides separate conversion tables per material because hardness depends on work-hardening behaviour.

inputScale

select

—

value

number

Yes

Hardness value in the selected Input Scale. Must lie within the tabulated ASTM E140 range for the chosen material.

decimalPlaces

number

—

{ "mcpServers": { "elysiatools-hardness-converter": { "name": "hardness-converter", "description": "Convert between Brinell (HB), Vickers (HV), and Rockwell (HRC / HRB) hardness via ASTM E140 tabulated data with linear interpolation. Three material classes: carbon/alloy steel (HV 100–960), austenitic stainless (HV 100–600), and cartridge brass (HV 40–200). Any input scale produces all the others; a scale that does not apply in the current hardness band returns 'out of range'. Indicative only — not for acceptance testing per ASTM E140.", "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=hardness-converter", "command": "", "args": [], "env": {}, "isActive": true, "type": "sse" } } }

{ "jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "hardness-converter", "arguments": { "material": "steel", "inputScale": "HV", "value": 200, "decimalPlaces": 1 } } }