S e c t i o n 1 - P a g e 4 May 2013 Extension Bolt ( 7 / 8 " High T ensile) 2 Part with Coupler 7 / 8 " High T ensile Extension Bolt Body Diameter E ±0.88" (±22.3 mm) Thr ead Size (left and right) I1 7 / 8 " - 9 UNC Thr ead Size (left and right) I2 7 / 8 " - 14 UNF 7 / 8 " High T ensile Extension Bolt Minimum Y ield Str ength 57,200 (254 kN) T ypical Ultimate Str ength 74,500 (330 kN) Ultimate Axial Strain Minimum 1.85 T or quing Pinch (optional) Nominal 70 ft - lbs 1 5 / 16 " Hex Nutrunner x 7 / 8 " hex socket 7 / 8 " UNC Hex Nut 7 / 8 " Har dened Round W asher TSW-1 Spherical Seat W asher 7 / 8 " UNF Coupler D5-1 Shell Plug for r esin installation D5-1 Expansion Shell O 1 3 / 4 " Dimensions T echnical Data Har dwar e www .dsiundergr ound.com