Ball Grades

Ball Grades

Grades and Tolerances - Inches
Grade	Size Range	Deviation from Spherical Form	Lot Diameter Variation	Allowable Ball Gage Variation	Nominal Ball Diameter Tolerance	Marking Increments	*Maximum Surface Roughness in Micro-Inches "Ra"**
3	0.006-1/2	0.000003	±0.00000	±0.00003	-	0.000010	0.5
5	0.006-1/2	0.000005	±0.00000	±0.00005	-	0.000010	0.8
10	0.006-7/8	0.000010	±0.000010	±0.00005	-	0.000010	1.0
25	0.006-1	0.000025	±0.000025	±0.00010	-	0.000010	2.0
50	0.006-1	0.000050	±0.000050	-	±0.0002	0.000050	3.0
100	0.006-1	0.000100	±0.000100	-	±0.0005	-	5.0
200	0.006-1	0.000200	±0.000200	-	±0.0010	-	8.0
1000	0.006-1	0.001000	±0.001000	-	±0.0050	-	-
*Maximum surface roughness arithmetic average.

Grades and Tolerances - Metric (Millimeters)
DIN Grade	ABMA Grade	Deviation from Spherical Form	Lot Diameter Variation	Allowable Ball Gage Variation	Nominal Ball Diameter Tolerance	Marking Increments	*Maximum Surface Roughness in Micro-Inches "Ra"**
-	3	0.00008	±0.00008	±0.0008	-	0.00025	0.012
-	5	0.00013	±0.00013	±0.0013	-	0.00025	0.020
I	10	0.00025	±0.00025	±0.0013	-	0.00025	0.025
II	25	0.00060	±0.00060	±0.0025	-	0.00025	0.051
III	50	0.00120	±0.00120	-	±0.0051	0.00127	0.076
IV	100	0.00250	±0.00250	-	±0.0381	-	0.127
-	200	0.00500	±0.00500	-	±0.0250	-	0.203
V	1000	0.02500	±0.02500	-	±0.1270	-	-
*Maximum surface roughness arithmetic average.

Other Ball Types that TRD Provides:
302 Stainless Steel Balls 304 Stainless Steel Balls 316 Stainless Steel Balls 440C Stainless Steel Balls Aluminum Balls Beryllium Copper Balls Brass Balls Ceramic Balls Copper Balls Chrome Steel Balls	Hastelloy Balls Inconel Balls Monel 400 Balls K-Monel Balls Niobium Balls Optical Glass Balls Tantalum Balls Titanium Balls Tungsten Carbide Balls Tool Steel Balls