Four pieces of expansion screws are also known as: four geckos.
The grades of expansion bolts are divided into: 45, 50, 60, 70, 80.
Expansion screw material: mainly divided into austenite A1, A2, A4,
Martensite and ferrite C1, C2, C4,
Its representation method is, for example, A2-70,
The "--" indicates the bolt material and strength grade before and after, respectively. The following is the complete expansion bolt specification table.
(1) Common materials for bolt materials: Q215, Q235, 25 and 45 steel. For important or special purpose threaded joints, alloy steel with high mechanical properties such as 15Cr, 20Cr, 40Cr, 15MnVB and 30CrMrSi can be used.
(2) The allowable stress and load properties (static and variable loads) of the allowable stress threaded couplings, whether the joints are tightened, whether the preloading force needs to be controlled, and the material and structural dimensions of the threaded couplings are related.
Different expansion screws are used according to the actual situation of the wall. Generally there are the following 6*60, 6*80, 6*120, 6*150.
6*60: total length 60 mm, casing length 45 mm, diameter 8 mm, wall thickness 0.7 mm, surface is zinc plated; screw length 60 mm, diameter 6 mm, threaded part 35 mm, bottom rod hammer 8 mm cone Shape, the surface is chrome-plated; the outer diameter of the nut is 10 mm octagonal, the thickness is 5 mm, the surface is white zinc plated; the outer diameter of the gasket is 13 mm, the thickness is 1 mm, the inner diameter is 6 mm, and the surface is white zinc; the elastic piece is the outer diameter. 9 mm, inner diameter 6 mm, thickness 1.6 mm ring.
6*80: total length 80 mm, casing length 65 mm, diameter 8 mm, wall thickness 0.7 mm, surface is plated with zinc; screw length, nut, gasket, shrapnel as above.
6*120: total length 120mm, casing length 105mm, diameter 8 mm, wall thickness 0.7 mm, surface is zinc plated; screw length, nut, gasket, shrapnel same as above.
6*150: total length 150mm, casing length 135mm, diameter 8 mm, wall thickness 0.7 mm, surface is zinc plating; screw length, nut, gasket, shrapnel same as above.
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