英制粗牙螺紋絲攻VS鑽頭下孔徑表

型號 : 英制粗牙螺紋

○ 英制粗牙螺紋 Whitworth Coarse Screw Thread

標稱 Nominalsize	鉆頭直徑 Drill dia		JIS 2級內螺紋內徑 JIS class 2 internal thread minor dia		BSW 內螺紋內徑 BSW internal thread minor dia
標稱 Nominalsize	A列(硬質材) Line A (Hard materials)	B列(軟質材) Line B (Soft materials)	最小尺寸 Min	最大尺寸 Max	最小尺寸 Min	最大尺寸 Max
※W1/8-40	2.55	2.45	-	-	2.362	2.591
※W3/16-24	3.7	3.6	-	-	3.406	3.774
※W1/4-20	5.1	5.0	4.914	5.204	4.724	5.156
W5/16-18	6.6	6.5	6.340	6.670	6.129	6.588
W3/8-16	8.0	7.9	7.733	8.113	7.493	7.988
W7/16-14	9.4	9.3	9.048	9.508	8.791	9.332
W1/2-12	10.7	10.5	10.310	10.830	9.990	10.589
W9/16-12	12.3	12.0	11.898	12.418	11.575	12.176
W5/8-11	13.7	13.5	13.257	13.817	12.918	13.558
W3/4-10	16.6	16.5	16.178	16.778	15.800	16.484
W7/8-9	19.5	19.3	19.031	19.691	18.613	19.354
W1-8	22.4	22.0	21.814	22.514	21.336	22.148
W1 1/8-7	25.0	24.8	24.469	25.229	23.927	24.831
W1 1/4-7	28.3	28.0	27.644	28.404	27.102	28.006
W1 3/8-6	30.5	30.3	30.123	30.923	-	-
W1 1/2-6	33.8	33.5	33.298	34.098	32.680	33.703
W1 5/8-5	36.0	35.7	35.529	36.409	-	-
W1 3/4-5	39.2	39.0	38.704	39.584	37.943	39.136
W1 7/8-4 1/2	41.8	41.5	41.237	42.227	-	-
W2-4 1/2	45.0	44.7	44.412	45.402	43.571	44.876