Steel Shield 12-piece combination wrench combination
A wrench is a common mounting and removal tool. Use the principle of leverage to twist bolts, screws, nuts, and other hand tools that hold the opening or socket firmware of the bolt or nut. The wrench usually has an external force applied to the one end or both ends of the handle to apply an external force to the external force of the handle, so that the bolt or nut can be screwed to the opening or sleeve hole of the bolt or nut. When using, apply an external force to the shank in the direction of thread rotation to twist the bolt or nut.
Wrenches are usually made of carbon structural steel or alloy structural steel.
The purpose of the combination wrench: large-scale industrial dual-purpose wrench is suitable for petroleum, chemical, metallurgy, power generation, oil refining, shipbuilding, petrochemical and other industries. It is an essential tool in equipment installation, installation and equipment maintenance and repair work. The combination wrench is divided into two types: metric and imperial.
The material of the combination wrench: the combination wrench is made by integral forging of 45 medium carbon steel or 40Cr alloy steel.
Manufacturing standard for combination wrench: GB/T4392-1995 (tap wrench and tap wrench).
The characteristics of the combination wrench: The combination wrench is forged from high-quality medium carbon steel or high-quality alloy steel. It has reasonable design, stable structure, high material density, strong anti-strike ability, no folding, continuous, no bending, product dimensional accuracy. High and durable.
Combination wrench: One end is the same as single-head wrench, the other end is the same as the wrench, and the bolts or nuts of the same specification are screwed at both ends. Explosion-proof combination wrench, using beryllium bronze and aluminum bronze alloy. Scope of application: Widely used Petroleum, petrochemical, petrol stations, oil depots, gas production, chemical industry, military, electric power, mining, electronics, railways, and other dangerous environments and explosions are also essential tools for machinery manufacturing and mechanical maintenance. Explosion-proof two The tensile strength of the beryllium bronze product processed by the wrench can reach 35 degrees or more, and the product of this material can be anti-magnetic, so the product is both explosion-proof and anti-magnetic, especially suitable for higher requirements. The use of aluminum bronze explosion-proof combination wrench can reach more than 25 degrees in the workplace. Explosion-proof combination wrench is a commonly used wrench. After processing in the machine shop, a series of tests will be carried out. Appearance quality inspection: There should be no cracks, burrs and obvious cracks, cuts, scales and other defects on the surface of the wrench. The handle should be straight. Dimensional inspection: The external dimensions of the wrench should meet the relevant requirements of GB4388 and GB4389. The tolerance of the opening of the wrench and the hole of the wrench shall comply with the provisions of the GB4390 standard.



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