API 6A Casing Head Assembly for wellhead equipment: lower wellhead component providing pressure seal and suspension point for casing strings. Includes casing head housing with studded/flanged/threaded outlets, slip or mandrel type hangers, FS secondary seal, elastomeric pack-off, and VR thread connections. Designed for vertical, horizontal, FRAC, thru-tubing, sidetrack and multi-lateral completions.