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Pen Balls: Available Grades and Sizes
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Size Range in Inches and Millimeters
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.015748 - .051181 0.4 - 1.3
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Pen Balls Download Product Sheet
Pen ball are manufactured of Tungsten Carbide (Type I and II), Stainless Steel, Ceramic, and other materials to produce flawless balls that meet exacting standards. Our Pen Ball product is specified by the writing instrument industry for use in ball points, rolling ball pens, and other writing instrument applications. Whatever, your pen ball requirements, we can supply a quality precision product for your needs.
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Balls per Jar
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.015748
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0.4
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200,000
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.000010
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.000020
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+/-.00005
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.019685
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0.5
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100,000
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.000010
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.000020
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+/-.00005
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.023622
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0.6
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100,000
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.000010
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.000020
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+/-.00005
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.025000
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0.636
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100,000
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.000010
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.000020
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+/-.00005
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.027559
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0.7
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75,000
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.000010
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.000020
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+/-.00005
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.029527
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0.75
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50,000
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.000010
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.000020
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+/-.00005
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.030905
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0.785
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50,000
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.000010
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.000020
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+/-.00005
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.031000
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-
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50,000
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.000010
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.000020
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+/-.00005
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.031250
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0.7938
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50,000
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.000010
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.000020
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+/-.00005
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.031496
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0.8
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50,000
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.000010
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.000020
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+/-.00005
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.039370
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1.0
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25,000
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.000010
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.000020
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+/-.00005
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.043307
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1.1
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20,000
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.000010
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.000020
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+/-.00005
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.051181
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1.3
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10,000
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.000010
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.000020
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+/-.00005
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Tungsten Carbide (Type I and II)
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Material Analysis
The wear resistant quality and the ability to withstand shock make tungsten carbide an excellent material for the ball point pen.
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Chemical Composition (by weight)
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Tungsten Carbide................................................
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94.0%
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Cobalt................................................................
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6.0%
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Mechanical Properties (by weight)
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Hardness (Rockwell A)........................................
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90.5 - 91.5
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Density..............................................................
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15.0 gm/cc
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Transverse Rupture Strength................................
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320,000 psi
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Stainless Steel Type 440-C AM
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Material Analysis
A cost-effective material with good writing characteristics. Corrosion resistant in normal domestic environments and mild industrial environments.
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Chemical Composition (by weight)
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Carbon..............................................................
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0.95% to 1.20%
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Manganese........................................................
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1.0% maximum
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Phosphorus.......................................................
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0.040% maximum
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Sulphur.............................................................
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0.030% maximum
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Silicon...............................................................
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1.0% maximum
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Chromium..........................................................
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16.00% maximum
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Molybdenum......................................................
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0.075% maximum
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Special Carbide
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Material Analysis
This material is primarily used in roller ball markets where additional corrosive protection is needed.
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Chemical Composition (by weight)
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Tungsten Carbide...............................................
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85.5%
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Cobalt...............................................................
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12.0%
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Chromium.........................................................
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2.5%
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Mechanical Properties (by weight)
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Hardness (Rockwell A).......................................
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91.1
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Density.............................................................
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14.15 gm/cc
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Transverse Rupture Strength...............................
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210,000 psi
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