Size and Compatibility: 1/4"-20 UNC thread (accepts 1/4" machine screws/bolts); drill hole size 5/8" (for wing deployment); overall length 4 inches; grip range 3/8"–3-5/8" for various wall thicknesses.
Design Elements: Spring-loaded steel wings that fold flat for insertion and spring open behind the wall; round or mushroom head (Phillips/slotted drive) for flush seating; includes machine screw for immediate use.
Material and Finish: Low-carbon steel with zinc plating (ASTM B633 compliant) for moderate corrosion resistance in indoor/dry environments; wings distribute load evenly to prevent pull-through.
Load Capacity: Ultimate tensile strength ~200–300 lbs per bolt (in 1/2" drywall; up to 265 lbs with heavy-duty variants; test to 4x safe working load; suitable for medium loads like shelves or mirrors).
Standards Compliance: Meets ASTM E488 for hollow wall anchors; easy installation with drill and screwdriver; wings open to brace against cavity for vibration resistance.