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Size Chart

Size Chart

Part # Borehole Sizes (in) Sizes (mm) Pieces / Box Box Weight*
BP-2 2" - 1 5/8" 51 - 40 mm 210 42 lbs [19.1 kg]
BP-2.5 2 ½" - 2 1/16" 64 - 52 mm 144 38 lbs [17.2 kg]
BP-3 3" - 2 9/16" 76 - 65 mm 160 45 lbs [20.4 kg]
BP-3.5 3 ½" - 3 1/16" 89 - 77 mm 96 32 lbs [14.5 kg]
BP-4 4" - 3 9/16" 101 - 90 mm 84 35 lbs [15.9 kg]
BP-4.5 4 ½" - 4 ¼" 114 - 100 mm 81 38 lbs [17.2 kg]
BP-5 5" - 4 ¾" 127 - 115 mm 48 28 lbs [12.7 kg]
BP-5.5 5 ½" - 5 ¼" 140 - 128 mm 48 29 lbs [13.2 kg]
BP-6 6" - 5 ¾" 152 - 141 mm 30 26 lbs [11.8 kg]
BP-6.5 6 ½" - 6 ¼" 165 - 153 mm 21 22 lbs [10.0 kg]
BP-7 7" - 6 ¾" 177 - 166 mm 18 25 lbs [11.3 kg]


* All box weights are approximate due to variations in wall thickness and length.


Available sizes of stemming plugs
We have partial tooling for smaller and larger sizes. Please contact us for information on VARISTEM sizes for 7-7/8″ (200mm) to 8.5″ (215mm) holes and other larger sizes, or for drill hole sizes smaller than 2″ (51mm).


VARI-STEM -- Size Chart

This size chart is only a guide. In many cases, undersized plugs prove effective, especially in cold weather. In cold weather the plugs do stiffen up. We recommend trying to keep the plugs in a warm environment (i.e., truck cab) prior to use, in order to keep them flexible. We can provide a low temperature formula, if needed.


Samples can be provided for hole size testing. (See our Sample Policy)