EFC International
EFC International
1940 Craigshire St. Louis,
MO 63146-4008
Phone: 1 314.434.28881
Contact: www.efc-intl.com/contact
Website: www.efc-intl.com
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BigHead® Collars consist of an internally threaded collar welded to a large perforated head. Standard collar lengths range from 5-22 mm, and standard heads range in size from 19-58 mm across. They are available in several different standard head shapes, to suit your specific application needs, with or without a sighted center hole and customized shapes and sizes are readily available. Their large perforated "head" provides an invisible, molded-in fastener, fixed for life, with very high torque and shear resistance. These fasteners are made from mild steel or stainless steel.
BigHead® Round and Rounded Corner Head Bondable Collar Nuts
Unit of Measure
1 2 3 

Item #

Item Name

Thread Size

Length

Head Diameter

25BF2B19-M6x10 N/A BigHead® M6 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M6 N/A 10 mm N/A 19 mm
25BF2B19-M6x22 N/A BigHead® M6 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M6 N/A 22 mm N/A 19 mm
25BF2B19-M8x10 N/A BigHead® M8 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M8 N/A 10 mm N/A 19 mm
25BF2S19-M5x10 N/A BigHead® M5 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M5 N/A 10 mm N/A 19 mm
25BF2B20-M6x10 N/A BigHead® M6 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M6 N/A 10 mm N/A 20 mm
25BSF2B20-M5x10 N/A BigHead® M5 Thread Size Stainless Steel Round Head Bondable Collar Nut N/A M5 N/A 10 mm N/A 20 mm
25BF2S20-M4x5 N/A BigHead® M4 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M4 N/A 5 mm N/A 20 mm
25BF2S20-M6x10 N/A BigHead® M6 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M6 N/A 10 mm N/A 20 mm
25BF2S20-M6x22 N/A BigHead® M6 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M6 N/A 22 mm N/A 20 mm
25BF2B23-M6x10 N/A BigHead® M6 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M6 N/A 10 mm N/A 23 mm
25BF2B23-M6x14 N/A BigHead® M6 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M6 N/A 14 mm N/A 23 mm
25BF2B23-M6x16 N/A BigHead® M6 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M6 N/A 16 mm N/A 23 mm
25BF2B23-M8x10 N/A BigHead® M8 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M8 N/A 10 mm N/A 23 mm
25BF2B23-M8x14 N/A BigHead® M8 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M8 N/A 14 mm N/A 23 mm
25BF2B23-M10x14 N/A BigHead® M10 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M10 N/A 14 mm N/A 23 mm
25BSF2B23-M4x10 N/A BigHead® M4 Thread Size Stainless Steel Round Head Bondable Collar Nut N/A M4 N/A 10 mm N/A 23 mm
25BSF2B23-M6x15 N/A BigHead® M6 Thread Size Stainless Steel Round Head Bondable Collar Nut N/A M6 N/A 15 mm N/A 23 mm
25BSF2B23-M8x15 N/A BigHead® M8 Thread Size Stainless Steel Round Head Bondable Collar Nut N/A M8 N/A 15 mm N/A 23 mm
25BSF2B23-M8x20 N/A BigHead® M8 Thread Size Stainless Steel Round Head Bondable Collar Nut N/A M8 N/A 20 mm N/A 23 mm
25BSF2B23-M10x20 N/A BigHead® M10 Thread Size Stainless Steel Round Head Bondable Collar Nut N/A M10 N/A 20 mm N/A 23 mm
25BF2S23-M6x10 N/A BigHead® M6 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M6 N/A 10 mm N/A 23 mm
25BF2S23-M6x16 N/A BigHead® M6 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M6 N/A 16 mm N/A 23 mm
25BF2S23-M8x10 N/A BigHead® M8 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M8 N/A 10 mm N/A 23 mm
25BF2S23-M10x14 N/A BigHead® M10 Thread Size Galvanized Steel Round Head Bondable Collar Nut N/A M10 N/A 14 mm N/A 23 mm
25BSF2S23-M4x5 N/A BigHead® M4 Thread Size Stainless Steel Round Head Bondable Collar Nut N/A M4 N/A 5 mm N/A 23 mm
Unit of Measure
1 2 3