{"uid":"cap_ZW7ZkGAfWD8CHegjw3eNi","slug":"sheet-metal-bend-allowance-calculator-00159a92","name":"Sheet Metal Bend Allowance Calculator","description":"Sheet-metal bend allowance, outside setback, bend deduction and flat length from angle, radius, thickness and K-factor.","url":"https://machining-calc.x402tookit.com/bend-allowance?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":["angle","insideRadius","thickness"],"properties":{"angle":{"type":"number","description":"Bend angle in degrees through which the metal turns, 0 to 180 (90 for a right-angle flange)"},"kFactor":{"type":"number","description":"K-factor 0.2 to 0.6 (default 0.33; about 0.4 to 0.5 for larger radii)"},"thickness":{"type":"number","description":"Material thickness, same unit"},"insideRadius":{"type":"number","description":"Inside bend radius (any unit; results use the same unit)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"source":{"type":["null","string"]},"kFactor":{"type":["null","number"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"thickness":{"type":["null","number"]},"disclaimer":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"angleDegrees":{"type":["null","number"]},"insideRadius":{"type":["null","number"]},"bendAllowance":{"type":["null","number"]},"bendDeduction":{"type":["null","number"]},"outsideSetback":{"type":["null","number"]},"neutralAxisRadius":{"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_VhTp2guotqS_m5KOeJ43w","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":"Calculates bend allowance, outside setback, bend deduction, and flat pattern length for sheet metal bends given angle, inside radius, material thickness, and K-factor.","exampleAgentPrompt":"Calculate the bend allowance, outside setback, and bend deduction for a 90-degree bend in 3mm thick mild steel with an inside radius of 5mm and a K-factor of 0.44.","exampleUseCases":[{"title":"Press brake flat pattern layout","prompt":"I need the flat blank length for a 90-degree right-angle flange in 16-gauge steel (about 1.5mm thick) with a 3mm inside radius — use a K-factor of 0.33 and give me the bend allowance and bend deduction too."},{"title":"Aluminum enclosure design check","prompt":"Can you work out the bend allowance and outside setback for bending 2mm aluminum at 120 degrees with a 4mm inside radius and a K-factor of 0.4?"},{"title":"Custom bracket fabrication planning","prompt":"I'm making a U-shaped bracket with two 90-degree bends in 3mm steel, inside radius 6mm and K-factor 0.45 — what's the bend deduction and neutral axis radius for each bend so I can calculate my flat pattern?"}],"resultDescription":"Returns a JSON object with: bendAllowance (arc length along the neutral axis), outsideSetback (distance from bend tangent to apex), bendDeduction (amount to subtract from total flange lengths for flat layout), neutralAxisRadius (radius to the neutral axis), plus the echoed inputs (angleDegrees, insideRadius, thickness, kFactor) and a summary string. Values are in the same unit as the input radius and thickness.","failureModes":["Missing required parameters (angle, insideRadius, or thickness) returns an error","Angle outside 0–180 degrees may return a validation error or unexpected result","K-factor outside 0.2–0.6 range may yield physically unrealistic results","Non-numeric parameter values return a parse or validation error","Network or payment (x402) failure returns HTTP 402 or connection error"],"whenToPreferThis":"Use this endpoint when you need precise sheet metal flat pattern calculations based on standard bend allowance formulas (BA = π/180 × angle × (insideRadius + K × thickness)). Ideal for automating press brake setups, CNC punching flat patterns, or any workflow that requires programmatic bend geometry without a full CAD system. Prefer this over manual lookup tables when the bend angle, radius, or material varies dynamically.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T00:34:27.455Z","isFirstParty":false,"canonicalSlug":"sheet-metal-bend-allowance-calculator-00159a92"}