MJ内螺紋攻絲前底孔直徑 QJ 2920 - 1997

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  螺紋标記	MJ内螺紋攻絲前底孔直徑 D' (mm)		推薦鑽頭直徑 ds (mm)
  	基本尺寸	極限偏差
  MJ1.6×0.2-4H6H	1.41	+0.05	1.4
  MJ1.6×0.35-4H6H	1.27	+0.09	1.31)
  MJ1.8×0.2-4H6H	1.61	+0.05	1.6
  MJ1.8×0.35-4H6H	1.47	+0.09	1.51)
  MJ2×0.25-4H6H	1.77	+0.06	1.81)
  MJ2×0.4-4H6H	1.63	+0.09	1.65
  MJ2.2×0.25-4H6H	1.97	+0.06	21)
  MJ2.2×0.45-4H6H	1.78	+0.11	1.81)
  MJ2.5×0.35-4H6H	2.17	+0.09	2.21)
  MJ2.5×0.45-4H6H	2.08	+0.11	2.11)
  MJ3×0.35-4H6H	2.67	+0.09	2.71)
  MJ3×0.5-4H6H	2.53	+0.12	2.55
  MJ3.5×0.35-4H6H	3.17	+0.09	3.21)
  MJ3.5×0.6-4H6H	2.94	+0.14	31)
  MJ4×0.5-4H6H	3.53	+0.12	3.61)
  MJ4×0.7-4H6H	3.35	+0.15	3.41)
  MJ4.5×0.5-4H6H	4.03	+0.12	4.11)
  MJ4.5×0.75-4H6H	3.8	+0.16	3.81)
  MJ5×0.5-4H6H	4.53	+0.12	4.51)
  MJ5×0.8-4H6H	4.26	+0.16	4.31)
  MJ5.5×0.5-4H5H	5.03	+0.1	51)
  MJ6×0.75-4H5H	5.3	+0.12	5.31)
  MJ6×1-4H5H	5.07	+0.15	5.11)
  MJ7×0.75-4H5H	6.3	+0.12	6.31)
  MJ7×1-4H5H	6.07	+0.15	6.11)
  MJ8×0.75-4H5H	7.3	+0.12	7.31)
  MJ8×1-4H5H	7.07	+0.15	7.11)
  MJ8×1.25-4H5H	6.84	+0.15	6.91)
  MJ9×0.75-4H5H	8.3	+0.12	8.3
  MJ9×1-4H5H	8.07	+0.12	8.11)
  MJ9×1.25-4H5H	7.84	+0.15	7.91)
  MJ10×0.75-4H5H	9.3	+0.12	9.3
  MJ10×1-4H5H	9.07	+0.15	9.11)
  MJ10×1.25-4H5H	8.84	+0.15	8.91)
  MJ10×1.5-4H5H	8.6	+0.18	8.6
  MJ11×0.75-4H5H	10.3	+0.12	10.3
  MJ11×1-4H5H	10.07	+0.15	10.11)
  MJ11×1.25-4H5H	9.84	+0.15	9.91)
  MJ11×1.5-4H5H	9.6	+0.18	9.6
  MJ12×1-4H5H	11.07	+0.15	11.11)
  MJ12×1.25-4H5H	10.84	+0.15	10.91)
  MJ12×1.5-4H5H	10.6	+0.18	10.6
  MJ12×1.75-4H5H	10.36	+0.2	10.41)
  MJ14×1-4H5H	13.07	+0.15	13.11)
  MJ14×1.25-4H5H	12.84	+0.15	12.91)
  MJ14×1.5-4H5H	12.6	+0.18	12.6
  MJ14×2-4H5H	12.12	+0.23	12.2
  MJ15×1-4H5H	14.07	+0.15	14.1
  MJ15×1.5-4H5H	13.6	+0.18	13.6
  MJ16×1-4H5H	15.07	+0.15	15.1
  MJ16×1.5-4H5H	14.6	+0.18	14.6
  MJ16×2-4H5H	14.12	+0.23	14.2
  MJ17×1-4H5H	16.07	+0.15	16.1
  MJ17×1.5-4H5H	15.6	+0.18	15.6
  MJ18×1-4H5H	17.07	+0.15	17.1
  MJ18×1.5-4H5H	16.6	+0.18	16.6
  MJ18×2-4H5H	16.12	+0.23	16.1
  MJ18×2.5-4H5H	15.64	+0.28	15.7
  MJ20×1-4H5H	19.07	+0.15	19.1
  MJ20×1.5-4H5H	18.6	+0.18	18.6
  MJ20×2-4H5H	18.12	+0.23	18.2
  MJ20×2.5-4H5H	17.64	+0.28	17.7
  MJ22×1-4H5H	21.07	+0.15	21.1
  MJ22×1.5-4H5H	20.6	+0.18	20.6
  MJ22×2-4H5H	20.12	+0.23	20.2
  MJ22×2.5-4H5H	19.64	+0.28	19.7
  MJ24×1-4H5H	23.07	+0.15	23.1
  MJ24×1.5-4H5H	22.6	+0.18	22.6
  MJ24×2-4H5H	22.12	+0.23	22.2
  MJ24×3-4H5H	21.16	+0.32	21.2
  MJ25×1-4H5H	24.07	+0.15	24.1
  MJ25×1.5-4H5H	23.6	+0.18	23.6
  MJ25×2-4H5H	23.12	+0.23	23.2
  MJ26×1.5-4H5H	24.6	+0.18	24.6
  MJ27×1-4H5H	26.07	+0.15	26.1
  MJ27×1.5-4H5H	25.6	+0.18	25.6
  MJ27×2-4H5H	25.12	+0.23	25.2
  MJ27×3-4H5H	24.16	+0.32	24.2
  MJ28×1-4H5H	27.07	+0.15	27.1
  MJ28×1.5-4H5H	26.6	+0.18	26.6
  MJ28×2-4H5H	26.12	+0.23	26.6
  MJ30×1-4H5H	29.07	+0.15	29.1
  MJ30×1.5-4H5H	28.6	+0.18	28.6
  MJ30×2-4H5H	28.12	+0.23	28.2
  MJ30×3-4H5H	27.16	+0.23	27.2
  MJ30×3.5-4H5H	26.67	+0.37	26.7
  MJ32×1.5-4H5H	30.6	+0.18	30.6
  MJ32×2-4H5H	30.12	+0.23	30.2
  MJ33×1.5-4H5H	31.6	+0.18	31.6
  MJ33×2-4H5H	31.12	+0.23	31.2
  MJ33×3-4H5H	30.16	+0.32	30.2
  MJ33×3.5-4H5H	29.67	+0.37	39.7
  MJ35×1.5-4H5H	33.6	+0.18	33.6
  MJ35×2-4H5H	33.12	+0.23	33.2
  MJ36×1.5-4H5H	34.6	+0.18	34.6
  MJ36×2-4H5H	34.12	+0.23	34.2
  MJ36×3-4H5H	33.16	+0.32	33.2
  MJ36×4-4H5H	32.19	+0.39	32.2
  MJ38×1.5-4H5H	36.6	+0.18	36.6
  MJ39×1.5-4H5H	37.6	+0.18	37.6
  MJ39×2-4H5H	37.12	+0.23	37.2
  MJ39×3-4H5H	36.16	+0.32	36.2
  MJ39×4-4H5H	35.19	+0.39	35.2
  MJ40×1.5-4H5H	38.6	+0.18	38.6
  MJ40×2-4H5H	38.12	+0.23	38.2
  MJ40×3-4H5H	37.16	+0.32	37.2
  MJ42×1.5-4H5H	40.6	+0.18	40.6
  MJ42×2-4H5H	40.12	+0.23	40.2
  MJ42×3-4H5H	39.16	+0.32	39.2
  MJ42×4-4H5H	38.19	+0.39	38.2
  MJ42×4.5-4H5H	37.71	+0.44	37.7
  MJ45×1.5-4H5H	43.6	+0.18	43.6
  MJ45×2-4H5H	43.12	+0.23	43.2
  MJ45×3-4H5H	42.16	+0.32	42.2
  MJ45×4-4H5H	41.19	+0.39	41.2
  MJ45×4.5-4H5H	40.71	+0.44	40.7
  MJ48×1.5-4H5H	46.6	+0.18	46.2
  MJ48×2-4H5H	46.12	+0.23	46.1
  MJ48×3-4H5H	45.16	+0.32	45.2
  MJ48×4-4H5H	44.19	+0.39	44.2
  MJ48×5-4H5H	43.23	+0.46	43.3
  MJ50×1.5-4H5H	48.6	+0.18	48.6
  MJ50×2-4H5H	48.12	+0.23	48.2
  MJ50×3-4H5H	47.16	+0.32	47.2
  MJ52×1.5-4H5H	50.6	+0.18	50.6
  MJ52×2-4H5H	50.12	+0.23	50.2
  MJ52×3-4H5H	49.16	+0.32	49.2
  MJ52×4-4H5H	48.19	+0.39	48.2
  MJ52×5-4H5H	47.23	+0.46	47.3
  ① 推薦鑽頭直徑數值僅供參考，必要時可用較大尺寸改善或采用專用鑽頭。   ② 推薦鑽頭直徑數值後帶"1）"者為符合 GB 1435~1438-85鑽頭标準數值。