{"uid":"cap_c_RbavN5RUafb-C0EtAi9","slug":"machining-fasteners-calc-tap-drill-size-lookup-005f2afc","name":"Machining & Fasteners Calc – Tap Drill Size Lookup","description":"Tap drill size for metric coarse (M3 to M24) and common inch threads (#4-40 to 1/2-20), with the formula check.","url":"https://machining-calc.x402tookit.com/tap-drill?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"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"]}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2Ov3N9RsVYOVE6YhSzJzb","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the recommended tap drill size (metric and inch) for a specified thread, along with formula verification and thread dimensional data.","exampleAgentPrompt":"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?","exampleUseCases":[{"title":"CNC shop tap drill selection","prompt":"I'm setting up a tapping operation for M6 metric coarse holes — what's the correct tap drill size in mm and does it match the standard formula?"},{"title":"Imperial thread hole prep","prompt":"What drill bit size do I need to pre-drill before tapping a 1/4-20 thread? Give me the size in both inches and mm."},{"title":"Engineering drawing verification","prompt":"I have a drawing that specifies a #10-32 tapped hole — can you confirm the correct tap drill size and verify the formula calculation?"}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T00:30:15.663Z","isFirstParty":false,"canonicalSlug":"machining-fasteners-calc-tap-drill-size-lookup-005f2afc"}