| Established in 1952 | |
Page: 3570 |
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This inexpensive ball kit contains a wide variety of 98 non standard precision balls. It consists of groups of special ball sizes centered around commonly used fractional inch balls. These ball sizes reflect the most frequently requested balls for inspection applications. Each group of seven balls contain a standard nominal fractional size ball as well as one each of a +.002", +.001", +.0005", +.0002", and - .001", - .002". The balls are precision lapped to meet the A.F.B.M.A. standard Grade 25. They are spherical within 25 millionths of an inch (635 nm). The surface finish is below 1.5 micro inches (38.1 nm) Ra and the exact ball size is within + or - .0001" of an inch (.00254 mm). |
Part # BK-14,
98 Sizes Very Hard Chrome Steel |
The balls are manufactured from chrome alloy steel that is hardened to 62 Rockwell C for wear resistance. This material has a thermal coefficient of expansion equal to 6.3 micro inches per inch per degree Fahrenheit or 11.4 micro meters per meter Centigrade. This matches steel gage blocks and is the same as most iron and steel products.
This ball kit includes the 14 most popular fractional inch sizes from 3/32" ( 2.381 mm ) to 1.00 inch to ( 25.4 mm ), see Summary / Prices Page.
Each of the 14 fractional groups of balls is packaged together in an individual plastic vial. These plastic vials are housed in a very rugged plastic tray. This tray is placed inside a robust steel shipping and storage case. This large steel case is 12 inches wide by 18 inches long by 3 inches deep.
| Part # | Nominal Size | Price | Purchase | |
| BK-14 | Ball Kit, | 14 Sizes | $345.15 |  |
| 093-BK | 3/32" | 2.381 mm | $29.97 | |
| 125-BK | 1/8" | 3.175 mm | $29.97 | |
| 156-BK | 5/32" | 3.969 mm | $29.97 | |
| 187-BK | 3/16" | 4.763 mm | $29.97 | |
| 218-BK | 7/32" | 5.556 mm | $29.97 | |
| 250-BK | 1/4" | 6.35 mm | $29.97 | |
| 312-BK | 5/16" | 7.938 mm | $31.15 | |
| 375-BK | 3/8" | 9.525 mm | $31.15 | |
| 437-BK | 7/16" | 11.113 mm | $31.15 | |
| 500-BK | 1/2" | 12.7 mm | $31.15 | |
| 625-BK | 5/8" | 15.875 mm | $31.15 | |
| 750-BK | 3/4" | 19.05 | $35.73 | |
| 875-BK | 7/8" | 22.225 mm | $42.77 | |
| 100-BK | 1" | 25.4 mm | $42.77 | |
| SA-OIL-PT | 1 Pint Sapphire Oil | 473.18 ml | $15.00 | |
| SA-OIL-GA | 1 Gallon Sapphire Oil | 3.785 Liters | $52.00 | |
| <Ball Gage 6, The Balwand™ |