Simpson HDU series: pre-engineered steel holdowns for shear wall anchorage per IBC/IRC. Models: HDU2 (3,075 lb allowable), HDU4 (4,565 lb), HDU5 (4,910 lb), HDU8 (6,930 lb), HDU11 (9,775 lb), HDU14 (14,930 lb). Installation: bolt through rim joist/mudsill, anchor bolt into concrete foundation. 5/8 in or 7/8 in anchor bolts. Deflection data published for engineering. IAPMO/ICC-ES evaluation report ESR-2182. Materials: 14 gauge (HDU2/4/5) or 10 gauge (HDU8+) ASTM A653 G90 galvanized steel. Cost: $15-$60 per connector. Required at ends of braced wall panels per IRC R602.10 or engineered shear wall design. Alternative to cast-in-place embedded straps. CSI 06 05 23. Also: PAHD (concealed), MSTC (embedded strap).