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Fiberglass Rock Bolts

Sigma DG Corporation has become known as the fiberglass rock bolt supplier of choice for North American mining companies of all types: coal, gold, moly, copper, potash, etc.
We have many different diameters and lengths to serve your needs. We are the ONLY manufacturer that sells DIRECT to mines saving them thousands of dollars per year in costs. If you want to work with people who KNOW and UNDERSTAND fiberglass (as opposed to it being just another SKU), you have come to the right place. Combined we have over 120 YEARS of fiberglass experience and often can solve your issues quickly and cost effectively.
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Fiberglass Rock Bolt


Using Sigma fiberglass bolts in situations where subsequent excavation will take place has long been a standard practice. The low shear strength and high tensile capacity (as compared to mild steel rock bolts) of the Sigma fiberglass bolts make it the ideal material for this application. The use of our bolts decreases machine down time because it is easily cutable and won't damage valuable mining equipment.
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  • Less down time due to torn belts

  • Less Prep plant magnet maintenance (empty 2x and 1x haul out per day)

  • Eliminates Prep plant plugged chutes

  • Less labor expense from cutting steel bolts from the cutter head 

  • Saved cutter jack hoses

  • Less damage to conveyor and Shuttle car conveyor chains

  • Corrosion resistant


  • Eliminates sparking

  • Eliminates belt rip potential

  • Reduction of Hot Work Permits - cutting/torching bolts from feeder pick breaker

  • Eliminates using torches under the cars and miner to remove hung bolts

  • No hang ups in belt discharge

  • No bolt retrieval by hand from CM or SC

Stack of Sigma DG Fiberglass Rock Bolts

Fiberglass ROck Bolt


Our standard rock bolt comes in either polyester or vinylester resins and diameters of:

  • 20mm Right Hand Thread

  • 22mm Right Hand Thread

  • 25mm Right and Left Hand Thread

  • 32mm Left Hand Thread

  • 32/12mm Hollow Left Hand Thread (20' length limit)

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2801 NW Lower River Road
Vancouver, WA 98660
Office: 360-859-3170
Fax: 360-891-0398
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