Generally, the diameter of the bolt multiplied by 1.5 times is the size of the socket and plum blossom. Allen wrench is generally the diameter of the bolt minus 2. All wrenches, including open-ended wrench, Allen wrench, box wrench, socket wrench, etc., refer to the width of the opposite side of the bolt head, and the specification of the bolt refers to the nominal diameter of the thread. For example, if the width of opposite side of M10 outer hexagon bolt is 16mm (see GB / 5780-86, which is available in the design manual), 16 open-ended wrench or ring wrench shall be selected. Another example is GB / 70-85 hexagon socket bolt. If the opposite side size of M10 hexagon socket bolt is 8mm, 8mm hexagon socket wrench shall be selected.

隨著經(jīng)濟(jì)的發(fā)展，我國很多企業(yè)進(jìn)口了大量的通用機(jī)械（如：水泵、閥門等）和設(shè)備，而這些設(shè)備的制造多采用英制標(biāo)準(zhǔn)，給企業(yè)日常維護(hù)時(shí)工器具的配備和選用帶來了一定的麻煩，尤其是螺栓所對(duì)應(yīng)的扳手。在此，筆者整理提供了一份扳手計(jì)算的資料供大家參考。

With the development of economy, many Chinese enterprises have imported a large number of general machinery (such as water pumps, valves, etc.) and equipment, and the manufacturing of these equipment mostly adopts British standards, which brings some trouble to the allocation and selection of tools and instruments during daily maintenance, especially the wrench corresponding to the bolt. Here, the author arranges and provides a wrench calculation data for your reference.

1、計(jì)算標(biāo)準(zhǔn)螺栓螺母尺寸（扳手尺寸）的經(jīng)驗(yàn)公式（采用分?jǐn)?shù)形式）：

1. Empirical formula for calculating standard bolt and nut size (wrench size) (in fractional form):

標(biāo)準(zhǔn)螺栓螺母尺寸（扳手尺寸）=（螺栓螺紋尺寸分子×3）÷（螺栓螺紋尺寸分子×2）

Standard bolt and nut size (wrench size) = (bolt thread size) × 3) ÷ (numerator of bolt thread size) × 2）

例如：1/2英寸螺紋的標(biāo)準(zhǔn)螺栓對(duì)應(yīng)的扳手尺寸=（1×3）÷（2×2）英寸=3/4英寸

For example: wrench size corresponding to standard bolt with 1 / 2 inch thread = (1) × 3）÷（2 × 2) Inch = 3 / 4 inch

2、計(jì)算加重螺栓螺母尺寸（扳手尺寸）的經(jīng)驗(yàn)公式（采用分?jǐn)?shù)形式）：

2. Empirical formula for calculating the size of weighted bolt and nut (wrench size) (in fractional form):

加重螺栓螺母尺寸（扳手尺寸）=標(biāo)準(zhǔn)螺栓螺母尺寸1/8

Weighted bolt and nut size (wrench size) = standard bolt and nut size 1 / 8

例如：1/2英寸螺紋的加重螺栓對(duì)應(yīng)的扳手尺寸=（1×3）÷（2×2）英寸1/8=7/8英寸

For example: wrench size corresponding to weighting bolt with 1 / 2 inch thread = (1) × 3）÷（2 × 2) Inch 1 / 8 = 7 / 8 inch

以下給出了少部分螺栓對(duì)應(yīng)扳手的列表，敬請(qǐng)使用。螺栓螺紋

The list of wrenches corresponding to a few bolts is given below. Please use it. Bolt thread

尺寸標(biāo)準(zhǔn)螺栓螺母尺寸（扳手尺寸）加重螺栓螺母尺寸（扳手尺寸）內(nèi)六角螺栓螺紋

Size standard bolt nut size (wrench size) weighted bolt nut size (wrench size) hexagon socket bolt thread