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ROOF SUPPORT MATERIAL - A11 components of [he root bolt assembly shall comply <br />with the American National Standards Institute "Specifications for Roof Bolting <br />Materials in Coal Mines." (ASTM F432-78) <br />H. ROOF BOLTS <br />Manufacturer Dyw•idag Systems Inter- Manufacturer's Designation <br />national Combination Bolt <br />Minimian Length 72" Overall <br />Type Steel High Strength <br />Length of Thread Continuous <br />Diameter 3/4" <br />Type Thread Hot Rolled <br />Type Head Hexagonal or six-sided nut <br />(Standard, Self-centering, Cone Neck) <br />Dimensions of Bolt Head:l-3/16"orl-1/8" Flange <br />1. REARING PLATES <br />Manufacturer Listed on Page 4 Manufacturer's Designation <br />Dimensions Listed on Page 4 <br />[~ <br />Shape Donut Embossed, Bell Embossed, Center Hole Size <br />Flat <br />J, WASHERS <br />Manufacturer Frazier Jones, Syracuse, Manufacturer's Designation <br />New York <br />*Type Steel hardened Size 2" X 1/2" <br />*Washers shall be through hardened to a hardness of 35 to 45 as measured on the <br />Rockwell C Scale. <br />Shape Spherical Hole Size 7/8" <br /> <br />K. ANCHORAGE UNIT <br />Manufacturer Dywidag Systems Inter- <br />national <br />Type No. 6 Rebar <br />Installed Torque 200-300 ft./lbs. <br />Manufacturer's Designation <br />2' min. grouting <br />Size of Finished Hole 1" <br />Page Four C <br />Added 07/27/87 <br />Revised 08/31/87 <br />