diff --git a/app/Services/Production/BendingInfoBuilder.php b/app/Services/Production/BendingInfoBuilder.php
index 37ac551..a35677c 100644
--- a/app/Services/Production/BendingInfoBuilder.php
+++ b/app/Services/Production/BendingInfoBuilder.php
@@ -218,7 +218,6 @@ public function buildDynamicBomForItem(array $context, int $width, int $height,
 
         // ─── 3. 셔터박스 세부품목 ───
         if ($boxSize) {
-            $isStandard = $boxSize === '500*380';
             $dist = $this->shutterBoxDistribution($width);
             // 상부덮개(top_cover), 마구리(fin_cover)는 1219mm 기준으로 별도 생성 (아래 256행~)
             $shutterPartTypes = ['front', 'lintel', 'inspection', 'rear_corner'];
@@ -231,7 +230,7 @@ public function buildDynamicBomForItem(array $context, int $width, int $height,
                         continue;
                     }
 
-                    $prefix = $resolver->resolveShutterBoxPrefix($partType, $isStandard);
+                    $prefix = $resolver->resolveShutterBoxPrefix($partType);
                     $itemCode = $resolver->buildItemCode($prefix, $length);
                     if (! $itemCode) {
                         continue;
@@ -259,7 +258,7 @@ public function buildDynamicBomForItem(array $context, int $width, int $height,
             // 상부덮개 수량: ceil(width / 1219) × qty (1219mm 단위)
             $coverQty = (int) ceil($width / 1219) * $qty;
             if ($coverQty > 0) {
-                $coverPrefix = $resolver->resolveShutterBoxPrefix('top_cover', $isStandard);
+                $coverPrefix = $resolver->resolveShutterBoxPrefix('top_cover');
                 $coverCode = $resolver->buildItemCode($coverPrefix, 1219);
                 if ($coverCode) {
                     $coverId = $resolver->resolveItemId($coverCode, $tenantId);
@@ -281,7 +280,7 @@ public function buildDynamicBomForItem(array $context, int $width, int $height,
             // 마구리 수량: qty × 2
             $finQty = $qty * 2;
             if ($finQty > 0) {
-                $finPrefix = $resolver->resolveShutterBoxPrefix('fin_cover', $isStandard);
+                $finPrefix = $resolver->resolveShutterBoxPrefix('fin_cover');
                 // 마구리는 박스 높이 기준이므로 셔터박스 최소 단위 사용
                 $finCode = $resolver->buildItemCode($finPrefix, 1219);
                 if ($finCode) {
diff --git a/app/Services/Production/PrefixResolver.php b/app/Services/Production/PrefixResolver.php
index 772b995..75f915d 100644
--- a/app/Services/Production/PrefixResolver.php
+++ b/app/Services/Production/PrefixResolver.php
@@ -189,16 +189,14 @@ public function resolveBottomBarPrefix(string $partType, string $productCode, st
     /**
      * 셔터박스 세부품목의 prefix 결정
      *
+     * CF/CL/CP/CB 품목은 모든 길이에 등록되어 있으므로 boxSize 무관하게 적용.
+     * top_cover, fin_cover는 전용 품목 없이 XX(하부BASE/상부/마구리) 공용.
+     *
      * @param  string  $partType  'front', 'lintel', 'inspection', 'rear_corner', 'top_cover', 'fin_cover'
-     * @param  bool  $isStandardSize  500*380인지
      * @return string prefix
      */
-    public function resolveShutterBoxPrefix(string $partType, bool $isStandardSize): string
+    public function resolveShutterBoxPrefix(string $partType): string
     {
-        if (! $isStandardSize) {
-            return 'XX';
-        }
-
         return self::SHUTTER_STANDARD[$partType] ?? 'XX';
     }