diff --git a/app/Console/Commands/NormalizeItemDimensions.php b/app/Console/Commands/NormalizeItemDimensions.php
new file mode 100644
index 0000000..1d268a6
--- /dev/null
+++ b/app/Console/Commands/NormalizeItemDimensions.php
@@ -0,0 +1,218 @@
+<?php
+
+namespace App\Console\Commands;
+
+use Illuminate\Console\Attributes\AsCommand;
+use Illuminate\Console\Command;
+use Illuminate\Support\Facades\DB;
+
+#[AsCommand(name: 'items:normalize-dimensions', description: '품목 attributes에서 thickness/width/length 정규화')]
+class NormalizeItemDimensions extends Command
+{
+    protected $signature = 'items:normalize-dimensions
+                            {--tenant_id=287 : Target tenant ID (default: 287 경동기업)}
+                            {--dry-run : 기본 모드 - 변경 예정 목록만 출력}
+                            {--execute : 실제 DB 업데이트 수행}';
+
+    protected $description = '101_specification_1/2/3에서 thickness/width/length를 추출하여 attributes에 정규화';
+
+    private int $updatedCount = 0;
+
+    private int $skippedCount = 0;
+
+    private array $changes = [];
+
+    public function handle(): int
+    {
+        $tenantId = (int) $this->option('tenant_id');
+        $execute = $this->option('execute');
+        $dryRun = ! $execute;
+
+        $this->info('=== 품목 치수 정규화 ===');
+        $this->info("Tenant ID: {$tenantId}");
+        $this->info('Mode: '.($dryRun ? 'DRY-RUN (미리보기)' : 'EXECUTE (실행)'));
+        $this->newLine();
+
+        $items = DB::table('items')
+            ->where('tenant_id', $tenantId)
+            ->whereNull('deleted_at')
+            ->whereRaw("JSON_EXTRACT(attributes, '$.\"101_specification_1\"') IS NOT NULL")
+            ->get();
+
+        $this->info("대상 품목: {$items->count()}건 (101_specification_1 존재)");
+        $this->newLine();
+
+        $bar = $this->output->createProgressBar($items->count());
+        $bar->start();
+
+        foreach ($items as $item) {
+            $this->processItem($item, $dryRun);
+            $bar->advance();
+        }
+
+        $bar->finish();
+        $this->newLine(2);
+
+        $this->showResults($dryRun);
+
+        return self::SUCCESS;
+    }
+
+    private function processItem(object $item, bool $dryRun): void
+    {
+        $attributes = json_decode($item->attributes, true) ?? [];
+
+        $spec1 = $attributes['101_specification_1'] ?? null;
+        $spec2 = $attributes['102_specification_2'] ?? null;
+        $spec3 = $attributes['103_specification_3'] ?? null;
+
+        $existingThickness = $attributes['thickness'] ?? null;
+        $existingWidth = $attributes['width'] ?? null;
+        $existingLength = $attributes['length'] ?? null;
+
+        $changed = false;
+        $changeDetails = [];
+
+        // thickness 추출: spec1에서 숫자 추출 (t/T 제거)
+        if ($spec1 !== null && $spec1 !== '' && $existingThickness === null) {
+            $thickness = $this->extractThickness($spec1);
+            if ($thickness !== null) {
+                $attributes['thickness'] = $thickness;
+                $changeDetails[] = "thickness: {$spec1} → {$thickness}";
+                $changed = true;
+            }
+        }
+
+        // width 추출: spec2에서 순수 숫자만
+        if ($spec2 !== null && $spec2 !== '' && $existingWidth === null) {
+            $width = $this->extractNumeric($spec2);
+            if ($width !== null) {
+                $attributes['width'] = $width;
+                $changeDetails[] = "width: {$spec2} → {$width}";
+                $changed = true;
+            }
+        }
+
+        // length 추출: spec3에서 순수 숫자만 (c, P/L, 문자 포함 시 스킵)
+        if ($spec3 !== null && $spec3 !== '' && $existingLength === null) {
+            $length = $this->extractLength($spec3);
+            if ($length !== null) {
+                $attributes['length'] = $length;
+                $changeDetails[] = "length: {$spec3} → {$length}";
+                $changed = true;
+            }
+        }
+
+        if ($changed) {
+            $this->changes[] = [
+                'id' => $item->id,
+                'name' => $item->name,
+                'changes' => implode(', ', $changeDetails),
+            ];
+
+            if (! $dryRun) {
+                DB::table('items')
+                    ->where('id', $item->id)
+                    ->update(['attributes' => json_encode($attributes, JSON_UNESCAPED_UNICODE)]);
+            }
+
+            $this->updatedCount++;
+        } else {
+            $this->skippedCount++;
+        }
+    }
+
+    /**
+     * thickness 추출: "t1.2", "T1.2", "1.2", "egi1.17" → 숫자
+     * 패턴: 선행 문자(t/T/영문) 제거 후 숫자 추출
+     */
+    private function extractThickness(?string $value): ?string
+    {
+        if ($value === null || trim($value) === '') {
+            return null;
+        }
+
+        $cleaned = trim($value);
+
+        // "t1.2", "T1.2" → "1.2"
+        $cleaned = preg_replace('/^[tT]/', '', $cleaned);
+
+        // "egi1.17", "sus1.2" → 영문자 제거 후 숫자 추출
+        if (preg_match('/(\d+(?:\.\d+)?)/', $cleaned, $matches)) {
+            return $matches[1];
+        }
+
+        return null;
+    }
+
+    /**
+     * 순수 숫자만 추출 (정수/소수)
+     * "1219" → "1219", "1219.5" → "1219.5"
+     * "c" → null, "" → null, "P/L" → null
+     */
+    private function extractNumeric(?string $value): ?string
+    {
+        if ($value === null || trim($value) === '') {
+            return null;
+        }
+
+        $cleaned = trim($value);
+
+        // 순수 숫자 (정수/소수)만 허용
+        if (preg_match('/^\d+(?:\.\d+)?$/', $cleaned)) {
+            return $cleaned;
+        }
+
+        return null;
+    }
+
+    /**
+     * length 추출: "3000" → "3000", "3000 P/L" → "3000", "c" → null
+     * 선행 숫자가 있고 뒤에 공백+문자(P/L 등)가 붙는 경우 숫자만 추출
+     */
+    private function extractLength(?string $value): ?string
+    {
+        if ($value === null || trim($value) === '') {
+            return null;
+        }
+
+        $cleaned = trim($value);
+
+        // 순수 숫자
+        if (preg_match('/^\d+(?:\.\d+)?$/', $cleaned)) {
+            return $cleaned;
+        }
+
+        // "3000 P/L" → "3000" (숫자로 시작하고 뒤에 공백+문자)
+        if (preg_match('/^(\d+(?:\.\d+)?)\s+/', $cleaned, $matches)) {
+            return $matches[1];
+        }
+
+        // "c", "P/L" 등 숫자 없는 경우
+        return null;
+    }
+
+    private function showResults(bool $dryRun): void
+    {
+        $this->info('=== 결과 ===');
+        $this->info("변경 대상: {$this->updatedCount}건");
+        $this->info("스킵 (변경 불필요): {$this->skippedCount}건");
+        $this->newLine();
+
+        if (! empty($this->changes)) {
+            $this->table(
+                ['ID', '품목명', '변경 내용'],
+                array_map(fn ($c) => [$c['id'], mb_substr($c['name'], 0, 30), $c['changes']], $this->changes)
+            );
+        }
+
+        if ($dryRun) {
+            $this->newLine();
+            $this->warn('DRY-RUN 모드입니다. 실제 적용하려면 --execute 옵션을 사용하세요:');
+            $this->line('  php artisan items:normalize-dimensions --execute');
+        } else {
+            $this->newLine();
+            $this->info("총 {$this->updatedCount}건 업데이트 완료");
+        }
+    }
+}