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Precision Miniature Ball Sizes

The product chart shows the standard size range of balls manufactured from specific materials. Visit our Products section for detailed technical specifications over a wide range of materials.

NEMB has an extensive inventory of standard and non-standard diameters available. Please contact our engineering or sales department for your specific needs, or fill out the quick RFQ form on our ordering page.

All gages are calibrated to Mil-STD-45662 and all master balls traceable to the National Institute of Standards and Technology (NIST).

Material Sizes

SIZE 440C 52100 316 302 2017-
T4 ALUM
BRASS TC44A TC55A COPPER TITANIUM NICKEL 420
4MM          
5/32"          
9/64"          
3.5MM          
1/8"    
3MM    
7/64"    
2.5MM    
3/32"    
2MM    
5/64"    
1/16"
1.5MM
3/64"
1MM
1/32"
0.025"
0.020"  
1/64"
INDIVIDUAL BALLS
Grade Allowable Ball Diameter Variation Allowable Deviation From Spherical Form Sphericity/Roundness Maximum Surface Roughness Arithmetical Average Ra
3 3 3 0.5
5 5 5 0.8
10 10 10 1
16 16 16 1
24 24 24 2
48 48 48 3
100 100 100 5
200 200 200 8
500 500 500 *
1000 1000 1000 *
BALLS BY LOT
Grade Allowable Lot Diameter Variation Basic Diameter Tolerance Allowable Ball Gauge Deviation Container Marking Increment
Hi Low
3 5 30 +30 -30 10
5 10 50 +50 -40 10
10 20 100 +50 -40 10
16 32 100 +50 -40 10
24 48 100 +100 -100 10
48 96 200 * 50
100 200 500 * *
200 400 1000 * *
500 1000 2000 * *
1000 2000 5000 * *

* Not applicable