McMaster-Carr logo
    Filter by
    System of Measurement
    Shape
    Tolerance Rating
    Hardness Rating
    Appearance
    Heat Treatment
    Magnetic Properties
    Precision Ball Grade
    Specifications Met
    Construction
    Mechanical Finish
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Elongation
    DFARS Specialty Metals
    Yield Strength
    Industrial Info Snippet
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Minimum Temperature
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    36 Products
    About Stainless Steel
    industrial info icon

    Compare over 25 types of stainless steel to find the right material for you—all with material certificates for traceability.

    Performance

    Performance

    Hardened Ultra-Wear-Resistant 440C Stainless Steel Balls

    Image of Product. Front orientation. Stainless Steel. Hardened Ultra-Wear-Resistant 440C Stainless Steel Balls.
    The best choice for high-performance bearings and valves, these 440C stainless steel balls are among the strongest, hardest, and most wear-resistant we offer. They’re passivated to wash away surface particles that cause rust, and they’re polished to a mirror-like finish that contaminants can’t stick to. The result is balls that stay smooth and stand the test of time—even at temperatures up to 800° F. They’re made to strict ISO 3290 standards for roundness and surface quality.
    These balls are magnetic, so you can use them in separators, sensors, and automated handling systems that use magnetic pickup or positioning.
    Grade 100—Great for mechanical applications where you don’t need the exacting tolerances of Grade 25.
    Grade 25—Precision-ground to tighter tolerances than Grade 100 balls. Use them in high-accuracy assemblies.
    Material Certificate Icon
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    Stainless
    Steel Balls
    5 lb. Packs of
    Stainless Steel Balls
    Dia.,
    mm
    Dia. Tolerance,
    mm
    Hardness
    Specs.
    Met
    Magnetic
    Properties
    Appearance
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    Grade 100
    1-0.0127 to 0.0127Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like2501598K1600000————0
    1.5-0.0127 to 0.0127Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like2501598K170000————0
    2-0.0127 to 0.0127Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like2501598K180000————0
    2.5-0.0127 to 0.0127Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like2501598K2200000————0
    3-0.0127 to 0.0127Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like2501598K2300000————0
    5-0.0127 to 0.0127Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like501598K260000————0
    10-0.0127 to 0.0127Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like101598K3200000————0
     
    Grade 25
    3.5-0.0025 to 0.0025Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like1001598K2400000————0
    4-0.0025 to 0.0025Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like501598K250000————0
    6-0.0025 to 0.0025Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like501598K27000002,5701598K2710000000
    7-0.0025 to 0.0025Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like251598K2800000————0
    8-0.0025 to 0.0025Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like251598K2900000————0
    12-0.0025 to 0.0025Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like101598K3300000————0
    13-0.0025 to 0.0025Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like51598K3400000————0
    14-0.0025 to 0.0025Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like51598K3500000————0
    15-0.0025 to 0.0025Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like51598K3600000————0
    16-0.0025 to 0.0025Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like31598K3700000————0
    18-0.0025 to 0.0025Rockwell C58 (Extra Hard)ISO 3290MagneticMirror Like31598K3800000951598K381000000
     

    Highly Corrosion-Resistant 316 Stainless Steel Balls

    Image of Product. Front orientation. Stainless Steel. Highly Corrosion-Resistant 316 Stainless Steel Balls.
    Trusted in marine and chemical-processing valves, these balls stand up to some of the most highly corrosive environments. Made of 316 stainless steel, they hold up to sulfuric acid, chlorine, and other harsh chemicals in temperatures as high as 1500° F. They’re a step up from balls made of 304, which have similar strength and temperature performance. They’re passivated to wash away surface particles that cause rust, and they’re polished to a mirror-like finish that contaminants can’t stick to. The result is balls that stay smooth and stand the test of time. They’re made to strict ISO 3290 standards for roundness and surface quality.
    Although 316 balls aren’t as wear resistant as 440C balls, they’re easier to fabricate. They’re also nonmagnetic.
    Grade 100—Great for mechanical applications where you don’t need the exacting tolerances of Grade 25.
    Material Certificate Icon
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    Stainless
    Steel Balls
    Dia.,
    mm
    Dia. Tolerance,
    mm
    Mechanical
    Finish
    Hardness
    Specs.
    Met
    Magnetic
    Properties
    Appearance
    Pkg.
    Qty.
    Pkg.
    Grade 100
    2.5-0.013 to 0.013TumbledRockwell C25 (Hard)ISO 3290NonmagneticMirror Like25096415K26500000
    3-0.013 to 0.013TumbledRockwell C25 (Hard)ISO 3290NonmagneticMirror Like25096415K540000
    3.5-0.013 to 0.013TumbledRockwell C25 (Hard)ISO 3290NonmagneticMirror Like10096415K5410000
    4-0.013 to 0.013TumbledRockwell C25 (Hard)ISO 3290NonmagneticMirror Like5096415K570000
    5-0.013 to 0.013TumbledRockwell C25 (Hard)ISO 3290NonmagneticMirror Like5096415K5810000
    6-0.013 to 0.013TumbledRockwell C25 (Hard)ISO 3290NonmagneticMirror Like5096415K5880000
    7-0.013 to 0.013TumbledRockwell C25 (Hard)ISO 3290NonmagneticMirror Like2596415K6370000
    8-0.013 to 0.013TumbledRockwell C25 (Hard)ISO 3290NonmagneticMirror Like2596415K77300000
    10-0.013 to 0.013TumbledRockwell C25 (Hard)ISO 3290NonmagneticMirror Like1096415K77700000
    12-0.013 to 0.013TumbledRockwell C25 (Hard)ISO 3290NonmagneticMirror Like1096415K93800000
     

    Multipurpose 304 Stainless Steel Balls

    Image of Product. Front orientation. Stainless Steel. Multipurpose 304 Stainless Steel Balls.
    Whether inside pumps or furnace parts, these balls can be used in any mildly corrosive, high-temperature conditions. Made of 304 stainless steel, they won’t degrade when exposed to mild chemicals and water, even at temperatures up to 1500° F. They’re passivated to wash away surface particles that cause rust, and they’re polished to a mirror-like finish that contaminants can’t stick to. The result is balls that stay smooth and stand the test of time. These balls are made to strict ISO 3290 standards for roundness and surface quality.
    Although 304 balls aren’t as wear resistant as 440C balls, they’re easier to fabricate. They’re also nonmagnetic.
    Grade 100—Great for mechanical applications where you don’t need the exacting tolerances of Grade 25.
    Material Certificate Icon
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    Stainless
    Steel Balls
    Dia.,
    mm
    Dia. Tolerance,
    mm
    Fabrication
    Hardness
    Specs. Met
    Magnetic
    Properties
    Appearance
    Pkg.
    Qty.
    Pkg.
    Grade 100
    3-0.0127 to 0.0127Cold WorkedRockwell C25 (Hard)ASTM A240, ISO 3290, SAE J405NonmagneticMirror Like2509291K7300000
    4-0.0127 to 0.0127Cold WorkedRockwell C25 (Hard)ASTM A240, ISO 3290, SAE J405NonmagneticMirror Like509291K750000
    5-0.0127 to 0.0127Cold WorkedRockwell C25 (Hard)ASTM A240, ISO 3290, SAE J405NonmagneticMirror Like509291K760000
    6-0.0127 to 0.0127Cold WorkedRockwell C25 (Hard)ASTM A240, ISO 3290, SAE J405NonmagneticMirror Like509291K770000
    8-0.0127 to 0.0127Cold WorkedRockwell C25 (Hard)ASTM A240, ISO 3290, SAE J405NonmagneticMirror Like259291K7900000
    10-0.0127 to 0.0127Cold WorkedRockwell C25 (Hard)ASTM A240, ISO 3290, SAE J405NonmagneticMirror Like109291K810000
     
    back to top