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MJ內螺紋攻絲前底孔直徑

螺紋標記	MJ內螺紋攻絲前底孔直徑 D' (mm)		推薦鉆頭直徑 ds (mm)
螺紋標記	基本尺寸	極限偏差	推薦鉆頭直徑 ds (mm)
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 推薦鉆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鉆頭。 ② 推薦鉆頭直徑數值后帶"1）"者為符合 GB 1435~1438-85鉆頭標準數值。

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注：數據僅供參考！