As a common repair tool, the wrench is very powerful. The dual-use wrenches as an indispensable hardware tool in the industrial industry, especially in the machinery and equipment manufacturing industry, play a certain role in promoting the development of the modern industry and the hardware and electronic machinery industry. Today Xiao Bian came to talk about the type specifications, inspection standards, and uses of dual-purpose wrenches.
　 Combination wrench type specifications
The combination wrenches are available in 5 sets, 6 sets, 7 sets, 8 sets, 9 sets, 11 sets, and 14 sets.
　　 Dual-purpose wrench inspection standard
The inspection standards for combination spanners, wrenches and spanners are: GB4388 to 4393.
1, appearance quality inspection
Spanner should not have cracks, burrs and obvious cracks, cut marks, oxide scales and other defects, the handle should be straight. The surface of the wrench should be plated, boiled or otherwise surface treated. The electroplated wrench shall have a uniform color on its surface. There shall be no defects such as pores, leakage plating, scorching, and delamination. The plating shall not be less than 8 μm. After the cook black handle, the surface should have a uniform black oxide layer, there should be no yellow, green, red spots and exposed bottom phenomenon.
2, size inspection
The external dimensions of the wrench should meet the relevant requirements of GB4388 and GB4389. The tolerances of the spanner opening and spanner hole shall comply with the provisions of the GB 4390 standard.
3, hardness test
The hardness of the wrench should comply with the provisions of Table 6-10-9.
4, torque test
The wrench torque shall comply with the relevant provisions of the GB 4393 standard.
5, the symmetry test of opening and head width
The deviation of the symmetry between the opening of the wrench and the width of the head shall comply with the relevant provisions in the GB 4393 standard.
6, surface roughness test
The surface roughness Ra of both sides of the wrench opening shall not be greater than 12.5 μm, and the surface roughness Ra of the wrench hole shall not exceed 25 μm.
　　 Use of dual-purpose wrench
Large industrial dual-use wrenches are suitable for petroleum, chemical, metallurgy, power generation, oil refining, shipbuilding, petrochemical and other industries. It is an essential tool for equipment installation, equipment and equipment repair and maintenance work. Combination wrenches are divided into metric and imperial.
The type specifications, inspection standards, and uses of the dual-purpose wrenches are introduced here. The dual-purpose wrenches are widely welcomed by the market and consumers because they also have the functions of a wrench and a spanner. Testing the combination wrenches is the precondition for ensuring their quality. Only by passing the inspection can the quality of the dual-purpose wrench be guaranteed, so that it can better serve the industry and people's daily life.
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