Graded - Precision Steel Balls

Sphere Engineers Pvt. Ltd. manufactures Precision Steel balls in various Grades form different Raw Material under stringent quality control from raw material stage to finish product stage to achieve desired Dimensional Control and very fine Surface Finish.

Precision Steel balls are manufactured for the application in Automotive Industries, Bearing Industries, Furniture Industries, Castor Wheel Industries, Cosmetic Industry for Spray Pump & Agitating in nail polish, foundation bottles etc. for mixing and for many other applications.

Tolerance by grade - AFBMA standard

TOLERANCE IN MICROMETERS

GRADE INDIVIDUAL BALLS LOTS OF BALLS
Allowable
Ball Diameter
Tolerance


µm
Allowable
Deviation from Spherical
form

µm
Maximum
Surface
Roughness
Arithmetical
average
µm
Allowable
lot Diameter
Variation


µm
Basic Diameter
Tolerance



µm
Allowable Ball
Gage Deviation

HIGH     LOW

µm

Container marking increment


µm
3 0.08 0.08 0.012 0.13 ±0.78 +0.75  -0.75 0.25
5 0.13 0.13 0.02 0.25 ±1.25 +1.25  -1.00 0.25
10 0.25 0.25 0.025 0.5 ±2.5 +1.25  -1.00 0.25
16 0.40 0.40 0.025 0.8 ±2.5 +1.25  -1.00 0.25
24 0.60 0.60 0.05 1.2 ±2.5 +2.5  -2.5 0.25
48 1.20 1.20 0.08 2.4 ±5 Not
Applicable
 
1.25
100 2.50 2.50 0.125 5 ±12.5 Not
Applicable
200 5.00 5.00 0.20 10 ±25
500 13.00 13.00 Not
Applicable
25 ±50
1000 25.00 25.00 50 ±125

Note : Steel Balls in accordance with DIN 5401 & ISO 3290 are also possible.

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