Estimation

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Ball Grade Terms

  • Ball Diameter Variation - The difference between the largest and the smallest single diameter measurements of one ball.
  • Ball Grade - A specific combination of dimensional, form and surface roughness tolerances. A ball grade is designated by the grade number.
  • Basic Diameter - The size ordered which is the basis to which the "Diameter Tolerance" specification applies.
  • Basic Diameter Tolerance - The maximum allowable deviation of any ball mean diameter from the Basic Diameter, in any shipment to fill orders for that Basic Diameter.
  • Deviation from Speherical Form - The greatest radial distance in any radial plane between a sphere circumscribed around the ball surface and any point on the ball surface.
  • Hardness - The measure of resistance to penetration of the ball surface or truncated flat of the ball by a specified indenting shape as determined by specified methods.
  • Lot - A definite quantity of balls manufactured under conditions which are presumed uniform and which is considered and identified as an entirety.
  • Lot Diameter Variation - The difference between the mean diameter of the largest ball and that of the smallest ball in the lot.
  • Passivation - A chemical treatment to remove corrodible surface impurities and to provide a protective film. This term is applicable to corrosion resisting balls only.
  • Specific Diameter - The diameter marked on the unit container, expressed in the grade's standard marking increment nearest to the mean diameter of the balls in that container.
  • Surface Roughness - Surface roughness consists of all those irregularities which form surface relief and which are conventionally defined within the area where deviations of form and waviness are eliminated.

If you are not a "ball expert" please call us first!

Step1: Quantity

Please enter the quantity

Step2: Material

Aluminum
Brass/Bronze
Bronze
Low/Hi Carbon
Chrome Steel
Ceramics
Cobalt
Copper
Glass
Hastelloy
Monel
M-50
Plastic
302/304 SS
316 SS
316L Stainless
420/440 SS
Tungsten Carbide
Other

Step3: Grade

Grade *Sphericity Diam.Tol.
3 .000003" +/- .00003"
5 .000005“ +/- .00005"
10 .000010" +/- .0001"
25 .000025“ +/- .0001"
50 .000050“ +/- .0002"
100 .0001“ +/- .0005"
200 .002“ +/- .001"
500 .005“ +/- .002"
1000 .001“ +/- .005"
2000 ungraded“  


Hardness
reference table

Material Rockwell
Chromesteel 52100 Rc 60-70
440C/420 Steel Rc 52-65
302/304/316 SS Rc 25-39
Carbon Steel Rc 60min
Aluminum 2017 Rc 54-72
Aluminum Bronze Rc 94-98
Brass Rb 75-87
Bronze Rb 75-98
Monel 400 Rb 85-95
K-Monel Rc 27min
Tungsten Carbide Ra 84-91

Step4: Diameter & Weight (per 1000 balls)

Inches 440/420 C/S Carbon 302SS 316SS T/C
1/32 0.004 0.005 0.005 0.005 0.005 0.009
1/16 0.035 0.036 0.36 0.037 0.037 0.069
3/32 0.12 0.122 0.123 0.123 0.124 0.233
1/8 0.283 0.289 0.29 0.292 0.295 0.552
5/32 0.553 0.565 0.567 0.571 0.575 1.08
3/16 0.956 0.977 0.98 0.987 0.994 1.86
7/32 1.52 1.55 1.56 1.57 1.58 2.96
1/4 2.27 2.32 2.32 2.34 2.36 4.42
9/32 3.23 3.3 3.31 3.33 3.35 6029
5/16 4.43 4.52 4.54 4.57 4.6 8.63
11/32 5.89 6.02 6.04 6.08 6.13 11.5
3/8 7.65 7.81 7.84 7.9 7.95 14.9
13/32 9.72 9.93 9.97 10 10.1 19
7/16 12.1 12.4 12.5 12.5 12.6 23.7
15/32 14.9 15.3 15.3 15.4 15.5 29.1
1/2 18.1 18.5 18.6 18.7 18.8 35.3
17/32 21.7 22.2 22.3 22.5 22.6 42.4
9/16 25.8 26.4 26.5 26.7 26.8 50.3
19/32 30.4 31 31.1 31.3 31.6 59.2
5/8 35.4 36.2 36.3 36.6 36.8 69
21/32 41 41.9 42 42.3 42.6 79.9
11/16 47.1 48.1 48.3 48.7 49 91.9
23/32 53.9 55 55.2 55.6 56 105
3/4 61.2 62.5 62.7 63.2 63.6 119
25/32 69.2 70.7 70.9 71.4 71.9 135
13/16 77.8 79.5 79.8 80.3 80.9 152
27/32 87.7 89 89.3 89.9 90.6 170
7/8 97.2 99.3 99.6 100 101 189
29/32 108 110 111 111 112 210
15/16 120 122 123 123 124 233
31/32 132 135 135 136 137 257
1 145 148 149 150 151 283
1-1/8 207 211 212 213 215 403
1-1/4 283 289 290 292 295 552
1-3/8 377 385 387 389 392 735
1-1/2 489 500 502 505 509 954
1-5/8 622 636 638 643 647 1,210
1-3/4 777 794 797 803 808 1,520
1-7/8 956 977 980 987 994 1,860
2 1,160 1,190 1,190 1,200 1,210 2,260
2-1/8 1,390 1,420 1,430 1,440 1,450 2,710
2-1/4 1,650 1,690 1,690 1,710 1,720 3,220
2-3/8 1,940 1,990 1,990 2,010 2,020 3,790
2-1/2 2,270 2,320 2,320 2,340 2,360 4,420
2-5/8 2,620 2,680 2,690 2,710 2,730 5,110
2-3/4 3,020 3,080 3,090 3,110 3,140 5,880
2-7/8 3,450 3,520 3,530 3,560 3,580 6,720
3 3,920 4,000 4,010 4,040 4,070 7,630
3-1/8 4,430 4,520 4,540 5,570 4,600 5,630
3-1/4 4,980 5,090 5,100 5,140 5,180 9,710
3-3/8 5,580 5,700 5,720 5,760 5,800 10,900
3-1/2 6,220 6,350 6,380 6,420 6,470 12,100
3-5/8 6,910 7,060 7,080 7,130 7,180 13,500
3-3/4 7,650 7,810 7,840 7,900 7,950 14,900
3-7/8 8,440 8,620 8,650 8,710 8,770 16,500
4 9,280 9,480 9,520 9,580 9,650 18,100
4-1/8 10,200 10,400 10,400 10,500 10,600 19,800
4-1/4 11,100 11,400 11,400 11,500 12,600 21,700
4-3/8 12,100 12,400 12,500 12,500 12,600 23,700
4-1/2 13,200 13,500 13,600 13,600 13,700 25,800

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To Order or Enquire Call 905-475-3660
or Ask for Mr. Malcalm