Mechanical Rock Bolts

Nominal 5/8" and 3/4" sizes and 7/8"
DimensionsHead Type5/8" Bolt3/4" Bolt7/8" Bolt
Body Diameter  EAll bolts±0.56" (±14.2mm)±0.68" (±17.3mm)±0.79" (±20.1mm)
Head Across Flats  F1-1/8" Square
T-Dome
1.088" - 1.125" (27.64 - 28.58 mm)
0.906" - 0.938" (23.01 - 23.83 mm)
Head Across Corners  G1-1/8" Square
T-Dome
1.425" - 1.591" (36.19 - 40.41 mm)
1.244" - 1.326" (31.60 - 33.68 mm)
Head Height  H1-1/8" Square & T-Dome0.40" (10.16 mm)
Thread Size (left and right)  IAll Bolts5/8”- 11 UNC3/4”- 10 UNC7/8”- 9 UNC

 All dimensions in accordance with ASTM F432 & CSA M430-90 specifications

Technical Data 
C1060 SteelC1070C1070M
5/8" Bolt3/4" Bolt 5/8" Bolt 5/8" TBE Bolt
Yield Strength, min.13,600 lbs
(60 kN)
20,000 lbs
(89 kN)
17,100 lbs
(76 kN)
28,400 lbs
(126 kN)
Tensile Strength, min.22,600 lbs
(100 kN)
33,400 lbs
(148 kN)
31,200 lbs
(139 kN)
35,000 lbs
(156 kN)
Ultimate Axial StrainMinimum 12%Minimum 8%Minimum 2.2%
C1055 (A29)A29 (gr75 for USA)
5/8" Bolt5/8" Bolt3/4" Bolt7/8" Bolt
Yield Strength, min.15,600 lbs
(69 kN)
17,000 lbs
(75 kN)
25,100 lbs
(111 kN)
34,700 lbs
(154.3 kN)
Tensile Strength, min.24,000 lbs
(106 kN)
22,600 lbs
(100 kN)
33,400 lbs
(149 kN)
46,200 lbs
(205.5 kN)
Ultimate Axial StrainMinimum 10%Minimum 8%

 All mechanical & physical properties in accordance with ASTM F432, ASTM A29 & CSA M430-90 specifications
5/8" steel special order