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ROOF SUPPORT <br />shall comply <br />fications fo <br />.i. ROOF BOLTS <br />Manufacturer <br />MATERIALS - All components of the roof bolt assembly <br />with the American National Standards Institute "Speci- <br />r Roof Bolting Materials in Coal Mtnes." (ASTM F432-7B) <br />Manufacturer's <br />Birmingham Bolt Co. Designation Point Anchor Bolts <br />Plinimum Length 72" Overall - Diameter 3/4" <br />Type Steel Grade 40 Minimum Type Thread Rolled <br />Length of Thread <br />4" <br />Dimensions of Bolt Head: Nut <br />I. BEARING PLATES <br />Type Head lab Nut <br />(Standard, Self-centering, Cone Neck) <br />1 1/8" Flange N/A <br />Manufacturer Listed on Page 4 Manufacturer's Designation <br />Dimensions Listed on Page 4 <br />• Center <br />Shape Hole Size <br />(Donut Embossed, Bell Embossed, Flat) <br />J. WASHERS Manufacturer's <br />Manufacturer Same as Roof Bolts Designation <br />and Bearing Plates. <br />*Type Steel Hardened Size 2° X 1/8" <br />*Washers shall be through hardened to a hardness of 35 to 45 as <br />measured on the Rockwell C Scale. <br />Shape Round, Flat Hole Size 13/16" <br />K. ANCHORAGE UNIT Manufacturer's <br />Manufacturer Birmingham Bolt Co. Designation 2' min. grouting <br />Type No. 6 Rebar • <br />Size of Finished Hole 1" <br />• Installed Torque 200-240 ft./lbs. <br />Page Four A <br />Added 02/04/83 <br />