Quilting Dictionary Y-SeamPiecingShare this Facebook Pinterest X WhatsApp Email Copy linkA set-in seam where three pieces meet at a single point, forming a Y shape. Common in blocks like Tumbling Blocks. Scant 1/4" Seam Nesting Seams Y-Seam / Set-in Chain Piecing Y-Seam / Set-In Seam Point Three angled fabric patches meeting at a single central point. Stitching stops exactly 1/4" before the edge. Stop 1/4" from pivot point Also see Block