diff --git a/furniture-3d-system/src/server/services/bom-costing/bom-costing-structure-blueprint.test.ts b/furniture-3d-system/src/server/services/bom-costing/bom-costing-structure-blueprint.test.ts
index 69eef8ee..6cf91860 100644
--- a/furniture-3d-system/src/server/services/bom-costing/bom-costing-structure-blueprint.test.ts
+++ b/furniture-3d-system/src/server/services/bom-costing/bom-costing-structure-blueprint.test.ts
@@ -227,6 +227,14 @@ describe('BOM v6 结构蓝图与 SKU 展开', () => {
               relatedSkuIds: [],
               basis: 'IMAGE',
               confidence: 0.9,
+            }, {
+              factId: 'fact-inner-depth',
+              kind: 'DIMENSION',
+              subject: '柜体内部深度',
+              value: '内深48',
+              relatedSkuIds: [],
+              basis: 'SOURCE_TEXT',
+              confidence: 0.96,
             }, {
               factId: 'fact-top',
               kind: 'PART',
@@ -329,8 +337,8 @@ describe('BOM v6 结构蓝图与 SKU 展开', () => {
     const lastTop = output.result.skus.at(-1)?.bomLines.find(
       (line) => line.externalLineId === 'enclosure-top',
     )
-    expect(firstTop).toMatchObject({ lengthMm: 1_400, widthMm: 620 })
-    expect(lastTop).toMatchObject({ lengthMm: 2_000, widthMm: 620 })
+    expect(firstTop).toMatchObject({ lengthMm: 1_400, widthMm: 480 })
+    expect(lastTop).toMatchObject({ lengthMm: 2_000, widthMm: 480 })
     expect(instantiationRequests).toHaveLength(7)
     for (const request of instantiationRequests) {
       expect(request.sku).toHaveLength(1)
diff --git a/furniture-3d-system/src/server/services/bom-costing/bom-costing-structure-blueprint.ts b/furniture-3d-system/src/server/services/bom-costing/bom-costing-structure-blueprint.ts
index 6583ef9b..2d883edc 100644
--- a/furniture-3d-system/src/server/services/bom-costing/bom-costing-structure-blueprint.ts
+++ b/furniture-3d-system/src/server/services/bom-costing/bom-costing-structure-blueprint.ts
@@ -694,7 +694,14 @@ function resolveInternalDepthMm(input: {
     if (!factAppliesToSku(record, input.sku.externalSkuId)) continue
     const context = `${record.fact.subject} ${record.fact.value}`
     if (!/内深|内部深|有效深/.test(context)) continue
-    const value = factMillimeters(record)
+    const unitlessValue = context.match(
+      /(?:内深|内部深|有效深)[^0-9]{0,8}([0-9]+(?:\.[0-9]+)?)/,
+    )?.[1]
+    const value = factMillimeters(record) ?? (
+      unitlessValue
+        ? toMillimeters(Number(unitlessValue), record.fact.unit)
+        : undefined
+    )
     if (value && (!input.outerDepthMm || value <= input.outerDepthMm)) return value
   }
   return input.outerDepthMm