Expansion bolt specifications and points for attention in construction

1. Product specifications of expansion screws:

Four-piece expansion screw is also known as: four-piece gecko. Also called expansion bolts and explosive screws, they are generally used in engineering construction, bridges, ships, automobiles, etc.

The grades of expansion bolts are divided into: 45, 50, 60, 70, 80,

The material of the expansion screw: mainly divided into austenite A1, A2, A4,

Martensite and Ferrite C1, C2, C4,

Its representation method such as A2-70,

--The front and rear respectively indicate the bolt material and strength grade. The following is the complete expansion bolt specification table.

45 steel, for important or special-purpose threaded joints, alloy steels with higher mechanical properties such as 15Cr, 20Cr, 40Cr, 15MnVB, 30CrMrSi, etc. can be used.

Choose different expansion screws according to the actual situation of the wall. Generally there are the following types: 6*60, 6*80, 6*120, 6*150. (Guide: Fasteners and screws are prone to bad phenomena)

6*60: total length 60 mm, casing length 45 mm, diameter 8 mm, wall thickness 0.7 mm, surface is color-plated zinc; screw length 60 mm, diameter 6 mm, threaded part 35 mm, bottom rod hammer 8mm cone, the surface is colored zinc plated; the nut has an octagonal shape with an outer diameter of 10 mm, a thickness of 5 mm, and the surface is white zinc plated; the gasket outer diameter is 13 mm, thickness 1mm, inner diameter 6 mm, and the surface is white zinc plated; shrapnel It is a circular ring with an outer diameter of 9 mm, an inner diameter of 6 mm, and a thickness of 1.6 mm.

6*80: The total length is 80 mm, the casing length is 65 mm, the diameter is 8 mm, the wall thickness is 0.7 mm, and the surface is color-plated zinc; the screw length, nut, gasket, and shrapnel are the same as above.

6*120: The total length is 120mm, the casing length is 105mm, the diameter is 8mm, the wall thickness is 0.7mm, and the surface is color-plated zinc; the screw length, nut, gasket, and shrapnel are the same as above.

6*150: The total length is 150mm, the casing length is 135mm, the diameter is 8mm, the wall thickness is 0.7mm, and the surface is color-plated zinc; the screw length, nut, gasket, and shrapnel are the same as above.

Two. Points to note during expansion screw construction:

1. Punching depth: The relevant information describes the length of the expansion tube, but I found that this depth is not enough during the specific construction, which may be related to the amount of debris in the hole, so you'd better be more than the length of the expansion tube About 5 mm deep. As long as you are greater than or equal to the length of the expansion pipe, the length of the expansion bolts left in the ground is equal to or less than the length of the expansion pipe.

2. The requirement of expansion bolts on the ground is of course the harder the better, it also depends on the force of the object you need to fix. Installed in concrete (C13-15), the force strength is five times that of bricks.

3. After a M6/8/10/12 expansion bolt is correctly installed in the concrete, its most undesirable maximum static force is 120/170/320/510 kg respectively.

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