英制尺寸換算 — 吋、分

公制對一般人較易理解,但因為英、美兩國還是用英制,而且像套筒、螺絲批批頭接口等規格都是用英文,學會看英制還是很有用的。

很多時都五金零件行買螺絲,除了要求公制規格外,也有英制的 “分”,例如 1 分螺絲、2 分螺絲, 1 分大約等如 3.175mm;1 吋等如 2.54cm, 這個還可以很容量理解,但一些套筒或螺絲批批頭,會用分數表示,例如 1/8, 3/8, 1/4 等。

1/8, 這個分數的意思是 1/8 寸,即 1 分。那麼就是說 1 分等如 1/8 寸,如果是 2 分,會用 1/4 代表。

以下是英制尺寸常用換算表:

1 尺 = 12 吋 = 30.48cm
1 吋 = 8 分 = 2.54cm
1 分 = 3.175mm


1/64″ = 0.3969mm
1/32″ = 0.7938mm
3/64″ = 1.1906mm
1/16″ = 1.5875mm = 半分
5/64″ = 1.9844mm
3/32″ = 2.3813mm
7/64″ = 2.7781mm
1/8″ = 3.175mm = 1 分
9/64″ = 3.5719mm
5/32″ = 3.9688mm
11/64″ = 4.3656mm
3/16″ = 4.7625mm = 1 分半
13/64″ = 5.1594mm
7/32″ = 5.5563mm
15/64″ = 5.9531mm
1/4″ = 6.35mm = 2分
17/64″ = 6.7469mm
9/32″ = 7.1438mm
19/64″ = 7.5406mm
5/16″ = 7.9375mm = 2 分半
21/64″ = 8.3344mm
11/32″ = 8.7313mm
23/64″ = 9.1281mm
3/8″ = 9.525mm = 3 分
25/64″ = 9.9219mm
13/32″ = 10.3188mm
27/64″ = 10.7156mm
7/16″ = 11.1125mm = 3 分半
29/64″ = 11.5094mm
15/32″ = 11.9063mm
31/64″ = 12.3031mm
1/2″ = 12.7mm = 4分
33/64″ = 13.0969mm
17/32″ = 13.4938mm
35/64″ = 13.8906mm
9/16″ = 14.2875mm = 4 分半
37/64″ = 14.6844mm
19/32″ = 15.0813mm
39/64″ = 15.4781mm
5/8″ = 15.875mm = 5 分
41/64″ = 16.2719mm
21/32″ = 16.6688mm
43/64″ = 17.0656mm
11/16″ = 17.4625mm = 5 分半
45/64″ = 17.8594mm
23/32″ = 18.2563mm
47/64″ = 18.6531mm
3/4″ = 19.05mm = 6 分
49/64″ = 19.4469mm
25/32″ = 19.8438mm
51/64″ = 20.2406mm
13/16″ = 20.6375mm = 6 分半
53/64″ = 21.0344mm
27/32″ = 21.4313mm
55/64″ = 21.8281mm
7/8″ = 22.225mm = 7 分
57/64″ = 22.6219mm
29/32″ = 23.0188mm
59/64″ = 23.4156mm
15/16″ = 23.8125mm = 7 分半
61/64″ = 24.2094mm
31/32″ = 24.6063mm
63/64″ = 25.0031mm
1” = 25.4mm = 8 分 = 1 吋


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