S ec t i o n 1 -P a g e5 May 2013 Stelpipe Bolts (Gr outable Rock Bolts) Nominal " and 1" sizes Dimensions Roll Thr eading T echnical Data 3 / 4 " (19 mm) Stelpipe 1" (25 mm) Stelpipe Body Diameter E 0.68" (17.3 mm) 0.92" (23.4 mm) Gr out Hole Diameter F 0.34" (8.6 mm) 0.40" (10.2 mm) Thr ead Size (left and right) I 3 / 4 ”- 10 UNC 1" - 8 UNC 3 / 4 " (19 mm) Stelpipe 1" (25 mm) Stelpipe Steel Grade 1022M Minimum T ensile Str ength 27,000 lbs (120 kN) 50,000 lbs (222 kN) Recommended Hole Diameter 1 1 / 4 " to 1 3 / 8 " (31.8 mm to 35 mm) 1 3 / 4 " (44.5 mm) Recommended Expansion Shell Frazer Jones Model 3 / 4 " F 1 / 4 " with bail center hole Frazer Jones Model 1" F9F with bail center hole Ultimate Axial Strain 15typical Thr ead Size / T ype Pitch Diameter Major Diameter 3 / 4 " - 10 UNC 0.6773" to 0.6832" (17.20 mm to 17.35 mm) 0.7353" to 0.7482" (18.68 mm to 19.00 mm) 1" - 8 UNC 0.9100" to 0.9168" (32.11 mm to 23.29 mm) 0.9830" to 0.9980" (24.97 mm to 25.35 mm) Standard UNC 2A V alues Left Hand (LH) Right Hand (RH) thr eads available Specication for the tube bolt steel is selected by Stelpipe's met allurgical department www .dsiundergr ound.com