Wood's Powr-Grip 91152 3 Concave Vacuum Cup with 1/4-20 x 5/8 Threaded Stud Wood's Powr-Grip 91152 3 Concave Vacuum Cup with 1/4-20 x 5/8 Threaded Stud UPC 718127911528 Brand Wood's Powr-Grip Color black Model 91152 Size Name 3 1/4-20 Unit Count 1 Count Item Weight 0.5 Pounds Part Number 91152 Thread Size 1/4-20 Thread Type 1/4-20 X 5/8 Threaded Stud Finish Types Unfinished Manufacturer Wood's Powr-Grip Thread Style Unified National Coarse (UNC) Fastener Type Threaded Stud Item Diameter 3 Inches Item Hardness B70 (Rockwell B) Material Type rubber pad Condition Type Grade B7 Exterior Finish Unfinished Item Dimensions 3 x 3.15 x 3.15 inches Thread Coverage Fully Threaded Number of Pieces 1 Screw Head Style Standard Hardware Material Alloy Steel Warranty Description 12 months Set Screw Thread Type Metric Coarse Maximum Shear Strength 35-60 ksi (kilopounds per square inch) or 241-414 MPa (megapascals) Compatible Groove Diameter 0.63 Inches