diff --git a/svc/routes/order_pdf.go b/svc/routes/order_pdf.go
index 24f6269..f8331b1 100644
--- a/svc/routes/order_pdf.go
+++ b/svc/routes/order_pdf.go
@@ -444,6 +444,20 @@ func contains(list []string, v string) bool {
 	return false
 }
 
+func formatPdfSizeLabel(cat, size string) string {
+	s := strings.TrimSpace(size)
+	if s == "" {
+		return s
+	}
+	if cat == catYas {
+		up := strings.ToUpper(s)
+		if _, err := strconv.Atoi(up); err == nil {
+			return up + "Y"
+		}
+	}
+	return s
+}
+
 /* ===========================================================
    2) PDF OLUŞTURUCU (A4 YATAY + FOOTER)
    =========================================================== */
@@ -987,8 +1001,9 @@ func drawGridHeader(pdf *gofpdf.Fpdf, layout pdfLayout, startY float64, catSizes
 		for i := 0; i < 16; i++ {
 			pdf.Rect(xx, cy, colW, layout.HeaderSizeH, "")
 			if i < len(sizes) {
+				label := formatPdfSizeLabel(cat, sizes[i])
 				pdf.SetXY(xx, cy+1)
-				pdf.CellFormat(colW, layout.HeaderSizeH-2, sizes[i], "", 0, "C", false, 0, "")
+				pdf.CellFormat(colW, layout.HeaderSizeH-2, label, "", 0, "C", false, 0, "")
 			}
 			xx += colW
 		}