The OTM-A105 (RED) and OTM-G105 (GREEN) are 4-inch grinding discs from the brand XO, manufactured in Thailand. They are designed for use with angle grinders and are a common choice for metalworking professionals and DIY enthusiasts in the region.
Here is a detailed description of these two abrasive discs:
Product Overview
Both discs share the same fundamental specifications:
Disc Type: Grinding Disc
Brand: XO
Origin: Thailand
Dimensions: 4 inches (100mm) in diameter, 6mm thick, with a 16mm bore (arbor size). This size is compatible with most standard 4-inch angle grinders.
Abrasive Grain: AWC 24R. This is a common marking for grinding discs, indicating:
AWC: A type of Aluminum Oxide (A) abrasive grain. This material is known for its durability and effectiveness in grinding and shaping ferrous metals.
24: The grit size. A low number signifies a coarse grit, which is highly effective for aggressive material removal, such as grinding down weld beads, beveling edges, or removing burrs.
R: The hardness grade of the bond. "R" typically denotes a medium-hard to hard bond, which allows the abrasive grains to be held securely, providing a long lifespan and consistent grinding performance on hard materials.
Maximum Speed: 13700 R.P.M. (revolutions per minute). It is critical to use these discs with an angle grinder that does not exceed this speed to ensure safety.
Key Difference: Red vs. Green
The main difference between the OTM-A105 (RED) and OTM-G105 (GREEN) discs is their intended application, which is distinguished by their color coding. This color distinction is a common practice in the abrasives industry.
OTM-A105 (RED) Grinding Disc
Color: Red
Primary Application: General purpose grinding of ferrous metals. This includes materials such as mild steel, carbon steel, and cast iron.
Performance: The red disc is a versatile workhorse designed for high stock removal rates on a wide range of common steel types. It's the go-to choice for everyday tasks in metal fabrication, construction, and repair, where the primary goal is to quickly and efficiently remove material.
OTM-G105 (GREEN) Grinding Disc
Color: Green
Primary Application: Grinding of stainless steel (INOX).
Performance: The green color signifies that this disc is specially formulated to be iron-free, sulfur-free, and chlorine-free (Fe/S/Cl-free). When grinding stainless steel, using a disc with these contaminants can cause "rust bloom" or corrosion on the workpiece, compromising its integrity and finish. The green OTM-G105 is designed to prevent this contamination, making it the correct and professional choice for any work on stainless steel, including grinding welds, shaping parts, or finishing surfaces. It can also be used on general metals without issue.
Summary
Feature OTM-A105 (RED) OTM-G105 (GREEN)
Primary Use General Metal Grinding Stainless Steel (INOX) Grinding
Materials Mild steel, carbon steel, cast iron, etc. Stainless steel (INOX) and general metal
Key Advantage Hi
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