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Two 30¡ã Helix Coolant Ducts Type 2H-30¡ã
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| unground | ground H6 | TK mm | Tol. | D | Tol. | pitch | Tol. | a mm | |
| ODmm | Tol. | ||||||||
| 6.3 | +1.0/+0.4 | 6.0 | 2.40 | ¡À0.20 | 0.70 | ¡À0.15 | 32.65 | +0.67/-0.65 | 0.15 |
| 7.3 | 7.0 | 3.50 | ¡À0.20 | 1.00 | ¡À0.15 | 38.09 | +0.78/-0.76 | 0.15 | |
| 8.3 | 8.0 | 3.80 | ¡À0.20 | 1.00 | ¡À0.15 | 43.53 | +0.89/-0.86 | 0.15 | |
| 9.3 | 9.0 | 4.50 | ¡À0.30 | 1.40 | ¡À0.15 | 48.97 | +1.00/-0.97 | 0.20 | |
| 10.3 | 10.0 | 4.50 | ¡À0.30 | 1.40 | ¡À0.15 | 54.41 | +1.11/-1.08 | 0.20 | |
| 11.3 | 11.0 | 4.90 | ¡À0.40 | 1.40 | ¡À0.15 | 59.86 | +1.22/-1.19 | 0.28 | |
| 12.3 | +1.1/+0.4 | 12.0 | 5.85 | ¡À0.40 | 1.40 | ¡À0.15 | 65.30 | +1.34/-1.30 | 0.30 |
| 13.3 | 13.0 | 6.10 | ¡À0.40 | 1.75 | ¡À0.20 | 70.74 | +1.45/-1.40 | 0.34 | |
| 14.3 | 14.0 | 6.70 | ¡À0.40 | 1.75 | ¡À0.20 | 76.18 | +1.56/-1.51 | 0.37 | |
| 15.3 | +1.2/+0.4 | 15.0 | 7.30 | ¡À0.40 | 1.75 | ¡À0.20 | 81.62 | +1.67/-1.62 | 0.40 |
| 16.3 | 16.0 | 7.90 | ¡À0.40 | 1.75 | ¡À0.20 | 87.06 | +1.78/1.73 | 0.40 | |
| 17.3 | 17.0 | 8.50 | ¡À0.40 | 1.75 | ¡À0.25 | 92.50 | +1.89/1.84 | 0.47 | |
| 18.3 | 18.0 | 9.15 | ¡À0.40 | 2.00 | ¡À0.25 | 97.95 | +2.00/1.94 | 0.50 | |
| 19.3 | +1.4/+0.4 | 19.0 | 9.70 | ¡À0.40 | 2.00 | ¡À0.25 | 103.39 | +2.12/-2.05 | 0.50 |
| 20.3 | 20.0 | 9.90 | ¡À0.50 | 2.00 | ¡À0.25 | 108.83 | +2.23/-2.16 | 0.50 | |
| Grade Chart | ||||||||
| grade | binder | grain size | density | hardness | T.R.S | USA | ISO | referenced grades |
| MH6 | 6.0 | Sub-micron | 14.9 | 93.6 | 2600 | C3 | K10 | KCR06/K6UF |
| MH8 | 8.0 | Sub-micron | 14.8 | 93.0 | 3000 | C2 | K20 | K20F |
| MH10 | 10.0 | Sub-micron | 14.5 | 92.1 | 3800 | C2 | K30 | MG18/H10F/K40UF |
| MH10F | 10.0 | Sub-micron | 14.5 | 92.0 | 3500 | C2 | K30 | K40XF |
| MH12 | 12.0 | Sub-micron | 14.3 | 92.4 | 4000 | C2 | K30 | TSF44/TF25/K44UF |
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