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52100 Chromium Steel Sphere, Grade G25, Mirror-Like Finish, Precision Tolerance, ASTM A295, 0.219" Diameter, 0.000024" Sphericity (Pack of 100)

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Product Specifications
Brand Name
Small Parts
Indentation Hardness
60-67 rockwell_c
Manufacturer Grade
Number of Items
Outside Diameter
0.219  inches
Outside Diameter Tolerance
+/-0.0001  inches
Part Number
Tensile Strength Max
325000  PSI
Specification for this product family (See all  products)
Exterior Finish
Item Shape
Solid Sphere
0.000024  inches
Specification Met
Material Composition
Material Type
Alloy Steel
System of Measurement

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Key Features

  • 52100 alloy steel provides high strength, high resistance to corrosion and wear, and good machinability
  • Meets ASTM A295 specifications
  • Meets grade 25 sphere tolerance
  • Reflective finish provides a bright, mirror-like appearance
  • Precision tolerance

Package Details

Shipping Weight: 0.16 pounds
Package Size: 4 x 3 x 0.25 inches

Product Description

The 52100 chromium steel sphere has a reflective finish, meets American Society for Testing and Materials International ASTM A295 specifications, meets grade 25 sphere tolerance standards, and has a precision tolerance. The 52100 alloy steel grade has a high carbon and chromium content for high strength, high resistance to corrosion and wear, and good machinability. This material can be heat treated for higher hardness. The reflective finish provides a bright, mirror-like appearance.

Steel is an iron alloy with carbon and other elements that modify the steel to achieve specific properties. In general, steels with higher carbon content have greater strength, hardness, and wear resistance, while those with lower carbon content have more formability, weldability, and toughness. Carbon steels, which include most AISI-SAE grades in the 1000 range, are classified by their level of carbon content as low (below 0.3%), medium (0.3% to 0.6%) and high (0.6% and above). Alloy steels, which include AISI-SAE grades in the 1300 and 4000 ranges and above, incorporate elements such as chromium, molybdenum, and nickel to modify properties like machinability and corrosion resistance. Tool steels, which include most grades with a letter and number grade designation, have high carbide content for wear resistance, high hardness, and the ability to hold a cutting edge. Some tool steels are designed to resist deformation when used in elevated temperatures.

Tensile strength, used to indicate a material’s overall strength, is the peak stress it can withstand before it breaks. Wear resistance indicates the ability to prevent surface damage caused by contact with other surfaces. Toughness describes the material's ability to absorb energy before breaking, while hardness (commonly measured as indentation hardness) describes its resistance to permanent surface deformation. Formability indicates how easily the material can be permanently shaped. Machinability describes how easily it can be cut, shaped, finished, or otherwise machined, while weldability characterizes the ability to be welded.

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