The straight edge or square is made in accordance with the GB/6318-85 manufacturing standard, and applies the HT250 materials. It adopts the scraping or precise grinding process for its working surface. Aside from the equipment installation, this straight edge and angle ruler is also mainly used for inspecting the straightness and flatness of the working piece.
This type of metal measuring tool can be made of cast iron, magnesium alloy and stainless steel. The straight edge could be angle type, bridge type, or knife edge type. Meanwhile, the angle ruler includes the steel type, cylindrical type, cast iron type, and wide-stand magnalium type.