Mechanical Engineering

Flip through detailed drawings or standard bolt documentation, and the designation 6H/6g appears very frequently. The external thread is machined slightly smaller than the nominal size, while the internal thread maintains its correct tolerance range.

What are the differences between coarse and fine threads? Learn about their characteristics, load-bearing capacity, vibration resistance, practical applications, and how to choose the right type of thread in mechanical engineering, machine manufacturing, and industrial production.

How do metric and inch thread gauges differ? Learn how to distinguish M10×1.5 from 1/2"-13 UNC, thread pitch, thread crest angle, and how to choose the correct GO/NOGO gauge to avoid damaging parts.

What is the HRC hardness of heat-treated steel? Learn about the hardness of S45C, SCM440, and SKD11, how to evaluate HRC measurement rsults, and the reasons why steel may achieve incorrect hardness after heat treatment.

Rockwell, Brinell, and Vickers are three of the most common hardness testing methods currently used. Learn about the differences in measurement principles, application ranges, and how to choose the right method for each type of material.

HRC, HRB, and HRA all belong to the Rockwell hardness system but are applied to different material groups. Understanding the differences between HRC, HRB, and HRA helps in selecting the correct testing method, accurately reading specifications, and avoiding unnecessary errors in material quality assessment.

Bearings are critical components in most industrial power transmission systems. Their service life is typically determined by factors such as load, rotational speed, lubrication conditions, and the operating environment. In addition to these well-known factors, the surface quality of the mating interfaces between the bearing and the shaft or housing also has a direct impact on the durability and reliability of the entire drive assembly.

Perpendicularity inspection is a routine task in machining, machine assembly, and quality control. Two of the most commonly used tools for this purpose are steel engineer's squares and granite squares.

Machine vibration after assembly is not always related to the motor, bearings or drive system. In many cases, the root cause can be traced to very small geometric deviations introduced during the machining and assembly processes.

When selecting an square, you will often encounter two widely recognized standards: DIN 875 and JIS B7526. So, what are the differences between these standards, and where are they applied?