# Machining & Fasteners Calc – Tap Drill Size Lookup

> Machining & Fasteners Calc – Tap Drill Size Lookup is a paid API for AI agents from machining-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).

Returns the recommended tap drill size (metric and inch) for a specified thread, along with formula verification and thread dimensional data.

## Facts

- Endpoint: GET https://machining-calc.x402tookit.com/tap-drill?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/machining-fasteners-calc-tap-drill-size-lookup-005f2afc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_c_RbavN5RUafb-C0EtAi9

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability machining-fasteners-calc-tap-drill-size-lookup-005f2afc
```

Example prompt: What tap drill size should I use for an M10 metric coarse thread — give me the diameter in both mm and inches and check it against the formula?

## When to prefer this

Choose this endpoint when you need a fast, formula-verified tap drill size lookup for standard metric coarse (M3–M24) or common inch threads (#4-40 to 1/2-20). It is ideal for CNC programming, manual machining setup, and engineering verification workflows where you want both the recommended drill size and a formula cross-check in a single call. Prefer it over generic reference tables when you need machine-readable output with units in both mm and inches.

## Known failure modes

- Unsupported thread designation returns an error or null fields — only M3–M24 metric coarse and listed inch sizes (#4-40 to 1/2-20) are supported
- Malformed thread string (e.g. typos, wrong format) may result in a null response or degraded output
- Missing 'thread' query parameter causes a validation error
- Extremely unusual thread designations outside the supported list are not covered

## How this service works

Tap drill size for metric coarse (M3 to M24) and common inch threads (#4-40 to 1/2-20), with the formula check.

## Output

Returns the thread name, pitch in mm, major diameter in mm, recommended tap drill size in both mm and inches, the formula-derived drill diameter for cross-check, a verdict on whether the standard drill matches the formula, a plain-language summary, and optional warnings or disclaimer text. May include a 'degraded' flag if data is partially unavailable.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "thread"
     ],
     "properties": {
      "thread": {
       "type": "string",
       "description": "Thread name, for example M8, M10, #10-24 or 1/4-20. Metric: M3, M4, M5, M6, M8, M10, M12, M14, M16, M20, M24. Inch: #4-40, #6-32, #8-32, #10-24, #10-32, 1/4-20, 1/4-28, 5/16-18, 3/8-16, 1/2-13, 1/2-20"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "system": {
       "type": [
        "null",
        "string"
       ]
      },
      "thread": {
       "type": [
        "null",
        "string"
       ]
      },
      "pitchMm": {
       "type": [
        "null",
        "number"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "tapDrillMm": {
       "type": [
        "null",
        "number"
       ]
      },
      "formulaDrillMm": {
       "type": [
        "null",
        "number"
       ]
      },
      "tapDrillInches": {
       "type": [
        "null",
        "number"
       ]
      },
      "majorDiameterMm": {
       "type": [
        "null",
        "number"
       ]
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/machining-fasteners-calc-tap-drill-size-lookup-005f2afc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from machining-calc.x402tookit.com](https://www.zero.xyz/host/machining-calc.x402tookit.com/llms.txt)