How to choose the right wrench

The selection principle of wrenches :

HOAMR gives priority to box wrenches and socket wrenches, followed by mouth wrenches and adjustable wrenches.

Wrench what material is good: wrench material is generally carbon steel and alloy steel, alloy steel is generally chromium vanadium steel; Ming vanadium steel label a lot, generally speaking, the higher the label, the better the quality. Carbon steel material is generally used for low-grade products, chromium vanadium steel - generally used for high-grade products.

Appearance style:

There are many styles of dual-use wrenches, conventional convex shin, concave shin, flat shin three. Each kind of production process is not the same, the surface treatment is also very different. Convex tibia is mostly carbon steel, concave tibia is mostly alloy steel.

Appearance punching:

plum shape full, beautiful curve, wall thickness is even, more standard. In the punishment part, the glucoside is round, and the outside is excessively gentle and smooth. The inner wall of the hole is smooth and uniform, without burr and blade marks. Handshake, round, no flying edge.

Surface treatment:

There are many kinds of surface treatment, polishing, mirror, frosted mist, blackening, electrophoresis and so on. There are many subtle differences in the frosted mist.Among them, watermark fog is the most high-grade. Another very important is the quality of the above specifications and trademarks. The logo and specification should be clear and clear, and the font should be even and refined.

Thickness:

The smaller the thickness of the wrench of the same specification, the higher the requirements of torsion and other standards, the lighter the weight, the more comfortable the use of people, so the quality is about good.

Tolerance range:

For example, 14MM nut, corresponding 14MM opening; Punishment needs appropriate amplification, is conducive to rapid cooperation; However, it is not appropriate to enlarge too much, which will damage the nut and make it "slippery". So you need to be accurate in the opening or the quinceum.

Torsion and hardness: excellent quality is the need for a perfect combination of hardness and toughness, too hard toughness is not easy to break; Too soft and easy to shape.