2023-08-25
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Roller bit diameter
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Public errand
mm
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in
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mm
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3 1/2-13 3/4
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88.9-349.3
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+0.80
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14-17 1/2
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355.6-444.5
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+1.60
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≥17 5/8
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＞447.7
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+2.40
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Note: The required drill bit diameter is not within the range of this table, and the tolerance can be determined through negotiation.
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Roller bit diameter
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Connecting thread
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in
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mm
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Rotary shoulder type external thread connection code
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Chamfer diameter size
mm
（±0.4）
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3 1/2 - 4 1/2
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88.9 - 114.3
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2 3/8REG
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78.2
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4 5/8 - 5
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117.5 -127
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2 7/8REG
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92.5
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5 1/8 - 7 3/8
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130.2 - 187.3
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3 1/2REG
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105.2
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7 1/2 - 9 3/8
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190.5 - 238.1
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4 1/2REG |
136.1
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9 1/2 - 13 3/4
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241.3 - 349.3
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6 5/8REG |
187.7
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14 - 14 3/8
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355.6 - 365.1
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6 5/8REG |
187.7
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14 1/2 - 17 1/2
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368.3 - 444.5
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6 5/8REG ， 7 5/8REG |
187.7 ， 215.9
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17 5/8 - 18 1/2
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447.7 - 469.9
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6 5/8REG ， 7 5/8REG | 187.7 ， 215.9 |
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18 5/8 - 26
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473.1 - 660.4
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7 5/8REG ， 8 5/8REG | 215.9 ， 243.3 |
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≥27
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≥685.8
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8 5/8REG |
243.3
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Note: The required drill bit diameter is not within the range of this table, and the tolerance can be determined through negotiation.
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