Pipe joint pipe joint anchor bolt anchor MF43 1600 
 Seam of the bolt is also called "rock friction stabilizer", early seventies, Professor Scott developed by the United States by Ingersoll Rand as a patented product, the supply of mine supporting use. The early eighties, the Beijing Institute of well construction in the laboratory experiments to explore the joint pipe bolt achieved good results. Gradually after application in the coal industry. Seam of the bolt is a highly specialized support products, is the underground culvert roof and other engineering support use of advanced materials, with a manufacturing process is simple, easy to use shotcrete support in the underground anchor has strong, tensile strength big, strong expansion force so that the whole roof as one. 
 Seam of the meaning and bolt Type Size: Seam Model with MF bolt diameter (mm) Length (mm) that, where M means "anchor." F means "slit tube." Such as MF43, 1600, said slit tube bolt, the outer diameter of 43mm, 
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 Length is 1600mm. Slit tube size bolt specifications as follows: 
 Project Item MF33 MF43 
 Value Standard Value Standard Value Standard Value Standard Tolerance Tolerance Tolerance Tolerance 
 Pole 
 Body OD OD 33 ± 0.5 43 ± 0.5 
 Length Length 1400,1600,1800,2000 
 Aperture Aperture 10 ± 1.0 14 ± 1.5 
 Thickness Thickness 2.5-3.0 (Q235A-level cold-rolled steel) 
 Length of head and shoot Length of the first tip 40-50 
 Tip diameter of Head-end diameter 27 ± 0.5 37 ± 0.5 
 Care 
 Plate L × W Length × width 120 × 120 ± 2.0 150 × 150 ± 2.0 
 Height Height 15-25 ± 1.0 15-25 ± 1.0 
 Thickness Thickness 4-6 
 Aperture Aperture 35 ± 0.5 45 ± 0.5 
 Recommended diameter of drill blank Recommended Drill diameter 31 41 
 Distance from the end of the retaining ring The distance from the end of the retaining ring 4-6