攻牙底孔参数.doc

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攻牙底孔的使用参数表
一、螺紋下孔徑表
1、公制粗牙螺紋 JIS B 0209-1982(單位：mm)
螺纹尺寸
钻头直径
螺纹下孔徑
內螺紋小徑
最小直径
最大直径
M 1 × 0.25
0.75
0.78 (80%)
0.729
0.785
1.1 × 0.25
0.85
0.88 (80%)
0.829
0.885
1.2 × 0.25
0.95
0.98 (80%)
0.929
0.985
1.4 × 0.3
1.1
1.14 (80%)
1.075
1.142
1.6 × 0.35
1.25
1.32 (75%)
1.221
1.321
1.8 × 0.35
1.45
1.52 (75%)
1.421
1.521
2 × 0.4
1.6
1.65 (80%)
1.567
1.679
2.2 × 0.45
1.75
1.83 (75%)
1.713
1.838
2.5 × 0.45
2.1
2.13 (75%)
2.013
2.138
3 × 0.5
2.5
2.59 (75%)
2.459
2.599
3.5 × 0.6
2.9
3.01 (75%)
2.850
3.010
4 × 0.7
3.3
3.39 (80%)
3.242
3.422
4.5 × 0.75
3.8
3.85 (80%)
3.688
3.878
5 × 0.8
4.2
4.31 (80%)
4.134
4.334
6 × 1
5
5.13 (80%)
4.917
5.153
7 × 1
6
6.13 (80%)
5.917
6.153
8 × 1.25
6.8
6.85 (85%)
6.647
6.912
9 × 1.25
7.8
7.85 (85%)
7.647
7.912
10 × 1.5
8.5
8.62 (85%)
8.376
8.676
11 × 1.5
9.5
9.62 (85%)
9.376
9.676
12 × 1.75
10.3
10.40 (85%)
10.106
10.441
14 × 2
12
12.2 (85%)
11.835
12.210
16 × 2
14
14.2 (85%)
13.835
14.210
18 × 2.5
15.5
15.7 (85%)
15.294
15.744
20 × 2.5
17.5
17.7 (85%)
17.294
17.744
22 × 2.5
19.5
19.2 (85%)
19.294
19.744
24 × 3
21
21.2 (85%)
20.752
21.252
27 × 3
24
24.2 (85%)
23.752
24.252
30 × 3.5
26.5
26.6 (90%)
26.211
26.771
33 × 3.5
29.5
29.6 (90%)
29.211
29.771
36 × 4
32
32.1 (90%)
31.670
32.270
39 × 4
35
35.1 (90%)
34.670
35.270
42 × 4.5
37.5
37.6 (90%)
37.129
37.799
45 × 4.5
40.5
40.6 (90%)
40.129
40.799
48 × 5
43
43.1 (90%)
42.587
43.297

註(1)M1.4以下等級：5H、M1.6以上等級：6H (2)基於JIS B 0209-1982標準

2、公制細牙螺紋-01 JIS B 0211-1982(單位：mm)
螺纹尺寸
钻头直径
螺纹下孔徑
內螺紋小徑
最小直径
最大直径
M 2.5 × 0.35
2.2
2.22 (75%)
2.121
2.221
3 × 0.35
2.7
2.72 (75%)
2.621
2.721
3.5 × 0.35
3.2
3.22 (75%)
3.121
3.221
4 × 0.5
3.5
3.59 (75%)
3.459
3.599
4.5 × 0.5
4
4.09 (75%)
3.959
4.099
5 × 0.5
4.5
4.59 (75%)
4.459
4.599
5.5 × 0.5
5
5.09 (75%)
4.959
5.099
6 × 0.75
5.3
5.35 (80%)
5.188
5.378
7 × 0.75
6.3
6.35 (80%)
6.188
6.378
8 × 1
7
7.13 (80%)
6.917
7.153
8 × 0.75
7.3
7.35 (80%)
7.188
7.378
9 × 1
8
8.13 (80%)
7.917
8.153
9 × 0.75
8.3
8.35 (80%)
8.188
8.378
10 × 1.25
8.8
8.85 (85%)
8.647
8.912
10 × 1
9
9.13 (80%)
8.917
9.153
10 × 0.75
9.3
9.35 (80%)
9.188
9.378
11 × 1
10
10.13 (80%)
9.917
10.153
11 × 0.75
10.3
10.35 (80%)
10.188
10.378
12 × 1.5
10.5
10.62 (85%)
10.376
10.676
12 × 1.25
10.8
10.85 (85%)
10.647
10.912
12 × 1
11
11.13 (80%)
10.917
11.153
14 × 1.5
12.5
12.62 (85%)
12.376
12.676
14 × 1
13
13.13 (80%)
12.917
13.153
15 × 1.5
13.5
13.62 (85%)
13.376
13.676
15 × 1
14
14.13 (80%)
13.917
14.153
16 × 1.5
14.5
14.62 (85%)
14.376
14.676
16 × 1
15
15.13 (80%)
14.917
15.153
17 × 1.5
15.5
15.62 (85%)
15.376
15.676
17 × 1
16
16.13 (80%)
15.917
16.153
18 × 2
16
16.2 (85%)
15.835
16.210
18 × 1.5
16.5
16.62 (85%)
16.376
16.676
18 × 1
17
17.13 (80%)
16.917
17.153
20 × 2
18
18.2 (85%)
17.835
18.210
20 × 1.5
18.5
18.62 (85%)
18.376
18.676
20 × 1
19
19.13 (80%)
18.917
19.153
22 × 2
20
20.2 (85%)
19.835
20.210
22 × 1.5
20.5
20.62 (85%)
20.376
20.676
22 × 1
21
21.13 (80%)
20.917
21.153
24 × 2
22
22.2 (85%)
21.835
22.210
24 × 1.5
22.5
22.62 (85%)
22.376
22.676
24 × 1
23
23.13 (80%)
22.917
23.153
25 × 2
23
23.2 (85%)
22.835
23.210
25 × 1.5
23.5
23.62 (85%)
23.376
23.676
25 × 1
24
24.13 (80%)
23.917
24.153

公制細牙螺紋-02 JIS B 0211-1982(單位：mm)
螺纹尺寸
钻头直径
螺纹下孔徑
內螺紋小徑
最小直径
最大直径
M 26 × 1.5
24.5
24.62 (85%)
24.376
24.676
27 × 2
25
25.2 (85%)
24.835
25.210
27 × 1.5
25.5
25.62 (85%)
25.376
25.676
27 × 1
26
26.13 (80%)
25.917
26.153
28 × 2
26
26.2 (85%)
25.835
26.210
28 × 1.5
26.5
26.62 (85%)
26.376
26.676
28 × 1
27
27.13 (80%)
26.917
27.153
30 × 3
27
27.2 (85%)
26.752
27.252
30 × 2
28
28.2 (85%)
27.835
28.210
30 × 1.5
28.5
28.62 (85%)
28.376
28.676
30 × 1
29
29.13 (80%)
28.917
29.153
32 × 2
30
30.2 (85%)
29.835
30.210
32 × 1.5
30.5
30.62 (85%)
30.376
30.676
33 × 3
30
30.2 (85%)
29.752
30.252
33 × 2
31
31.2 (85%)
30.835
31.210
33 × 1.5
31.5
31.62 (85%)
31.376
31.676
35 × 1.5
33.5
33.62 (85%)
33.376
33.676
36 × 3
33
33.2 (85%)
32.752
33.252
36 × 2
34
34.2 (85%)
33.835
34.210
36 × 1.5
34.5
34.62 (85%)
34.376
34.676
38 × 1.5
36.5
36.62 (85%)
36.376
36.676
39 × 3
36
36.2 (85%)
35.752
36.252
39 × 2
37
37.2 (85%)
36.835
37.210
39 × 1.5
37.5
37.62 (85%)
37.376
37.676
40 × 3
37
37.2 (85%)
36.752
37.252
40 × 2
38
38.2 (85%)
37.835
38.210
40 × 1.5
38.5
38.62 (85%)
38.376
38.676
42 × 4
38
38.1 (90%)
37.670
38.270
42 × 3
39
39.2 (85%)
38.752
39.252
42 × 2
40
40.2 (85%)
39.835
40.210
42 × 1.5
40.5
40.62 (85%)
40.376
40.676
45 × 4
41
41.1 (90%)
40.670
41.270
45 × 3
42
42.2 (85%)
41.752
42.252
45 × 2
43
43.2 (85%)
42.835
43.210
45 × 1.5
43.5
43.62 (85%)
43.376
43.676
48 × 4
44
44.1 (90%)
43.670
44.270
48 × 3
45
45.2 (85%)
44.752
45.252
48 × 2
46
46.2 (85%)

45.835
46.210
48 × 1.5
46.5
46.62 (85%)
46.376
46.676
50 × 3
47
47.2 (85%)
46.752
47.252
50 × 2
48
48.2 (85%)
47.835
48.210
50 × 1.5
48.5
48.62 (85%)
48.376
48.676
註(1)等級：6H
(2)基於JIS B 0211-1982標準
3、美制粗牙螺紋 (單位：mm)
螺纹尺寸
钻头直径
2B级螺纹下孔徑
內螺紋小徑
最小直径
最大直径
NO.1 -64UNC
1.55
1.57 (65%)
1.425
1.582
2 -56
1.8
1.86 (65%)
1.695
1.871
3 -48
2.1
2.14 (65%)
1.941
2.146
4 -40
2.3
2.36 (70%)
2.157
2.385
5 -40
2.6
2.69 (70%)
2.487
2.697
6 -32
2.8
2.86 (75%)
2.642
2.895
8 -32
3.4
3.52 (75%)
3.302
3.530
10 -24
3.9
3.91 (80%)
3.683
3.962
12 -24
4.5
4.57 (80%)
4.344
4.597
1/4 -20
5.1
5.25 (80%)
4.979
5.257
5/16 -18
6.6
6.72 (80%)
6.401
6.731
3/8 -16
8
8.15 (80%)
7.798
8.153
7/16 -14
9.4
9.50 (80%)
9.144
9.550
1/2 -13
10.8
11.0 (80%)
10.592
11.023
9/16 -12
12.2
12.3 (85%)
11.989
12.446
5/8 -11
13.6
13.8 (85%)
13.386
13.868
3/4 -10
16.5
16.8 (80%)
16.307
16.840
7/8 - 9
19.5
19.6 (85%)
19.177
19.761
1 - 8
22.2
22.5 (85%)
21.971
22.606
1 1/8 - 7
25
25.2 (85%)
24.638
25.349
1 1/4 - 7
28.2
28.4 (85%)
27.813
28.524
1 3/8 - 6
30.8
31.0 (85%)
30.353
31.115
1 1/2 - 6
34
34.2 (85%)
33.528
34.290
1 3/4 - 5
39.5
39.8 (85%)
38.964
39.827
2 - 4
45.2
45.3 (90%)
44.679
45.593

4、美制細牙螺紋 (單位：mm)
螺纹尺寸
钻头直径
2B级螺纹下孔徑
內螺紋小徑
最小直径
最大直径
NO. 0 -80UNF
1.25
1.30 (65%)
1.182
1.305
1 -72
1.55
1.61 (65%)
1.474
1.612
2 -64
1.85
1.90 (65%)
1.756
1.912
3 -56
2.1
2.17 (70%)
2.025
2.197
4 -48
2.4
2.44 (70%)
2.271
2.458
5 -44
2.7
2.74 (70%)
2.551
2.740
6 -40
2.9
3.02 (70%)
2.820
3.022
8 -36
3.5
3.59 (75%)
3.404
3.606
10 -32
4.1
4.14 (80%)
3.963
4.165
12 -28
4.6
4.70 (80%)
4.496
4.724
1/4 -28
5.5
5.56 (80%)
5.360
5.588
5/16 -24
6.9
7.02 (80%)
6.782
7.035
3/8 -24
8.5
8.61 (80%)
8.382
8.636
7/16 -20
9.9
10.01 (80%)
9.729
10.033
1/2 -20
11.5
11.60 (80%)
11.329
11.607
9/16 -18
12.9
13.07 (80%)
12.751
13.081
5/8 -18
14.5
14.65 (80%)
14.351
14.681
3/4 -16
17.5
17.59 (85%)
17.323
17.678
7/8 -14
20.5
20.6 (85%)
20.270
20.675
1 -12
23.2
23.5 (85%)
23.114
23.571
1 1/8 -12
26.5
26.7 (80%)
26.289
26.746
1 1/4 -12
29.5
29.9 (80%)
29.464
29.921
1 3/8 -12
32.8
33.0 (85%)
32.639
33.096
1 1/2 -12
36
36.2 (85%)
35.814
36.271

5、英制粗牙螺紋 (單位：mm)
螺紋尺寸
下 孔 徑
嵌 合 率
A列(硬材質)
B列(軟材質)
A列直徑
B列直徑
內螺紋最小徑
內螺紋最大徑
W 1/8
2.6
2.5
70.7
83.0
70.0
88.3
3/16
3.7
3.6
78.4
85.8
70.0
88.3
1/4
5.1
5.0
76.9
83.0
70.5
88.3
5/16
6.6
6.5
74.0
99.5
70.1
88.4
3/8
8.0
7.9
75.0
80.0
69.5
88.2
7/16
9.4
9.3
73.7
80.0
69.0
88.8
1/2
10.7
10.5
73.8
81.2
69.0
88.2
9/16
12.3
12.0
73.4
84.4
69.0
88.2
5/8
13.7
13.5
73.5
80.3
69.6
88.5
3/4
16.7
16.5
72.3
78.4
69.6
88.3
7/8
19.5
19.3
75.4
80.9
70.1
88.4
1
22.4
22.0
73.8
83.6
71.0
88.2
1 1/8
25.0
24.8
76.9
81.3
72.0
88.4
1 1/4
28.3
28.0
74.3
80.7
72.0
88.4
1 3/8
30.5
30.3
81.6
85.3
73.8
88.6
1 1/2
33.8
33.5
79.3
84.8
73.8
88.6
1 5/8
36.0
35.7
81.1
85.7
74.8
88.3
1 3/4
39.2
39.0
80.7
83.8
74.8
88.3
1 7/8
41.8
41.5
80.6
84.7
74.7
88.4
2
45.0
44.7
80.2
84.4
74.7
88.4

6、英制管用螺紋 (單位：mm)
管用螺紋尺寸
JIS B 0203
JIS B 2301
錐管內螺紋Rc(PT)
平行內螺紋Rp(PS)
錐管內螺紋
計 算 值
下 孔 徑
計 算 值
下 孔 徑
計 算 值
下 孔 徑
1/16
6.230
6.2
6.490
6.5
－
－
1/8
8.235
8.2
8.495
8.5
8.191
8.2
1/4
10.941
10.9
11.341
11.4
10.945
10.9
3/8
14.428
14.4
14.846
14.9
14.388
14.4
1/2
17.950
18
18.489
18.5
17.943
18
3/4
23.349
23
23.975
24
23.305
23
1
29.423
29
30.111
30
29.353
29
1 1/4
37.940
38
38.772
39
37.890
38
1 1/2
43.833
44
44.565
45
43.720
43
2
55.412
55
56.476
56
55.406
55
2 1/2
70.701
71
72.009
72
70.788
70
3
83.201
83
84.709
85
83.364
83
3 1/2
95.547
96
97.155
97
95.747
95
4
107.834
108
109.855
110
108.322
108
5
133.110
133
135.255
135
133.597
133
6
158.510
159
160.655
161
158.810
158
7
183.360
183
185.954
186

8
208.560
209
211.354
212

9
233.960
234
236.754
237

10
259.166
259
262.154
262

12
309.747
310
312.875
313

7、美制管用耐密斜行螺紋(NPTF‧NPSF) (單位：mm)
管用螺紋尺寸
斜行螺紋(NPTF)
平行螺紋(NPSF)
鑽頭直徑
鑽頭直徑
使用鉸刀場合
不使用鉸刀場合
1/16
－
0.234 ( 5.94)

0.246 ( 6.25)
1/4
0.250 ( 6.35)
1/8
21/64
0.328 ( 8.33)

0.339 ( 8.61)
11/32
0.344 ( 8.74)
1/4
27/64
0.422 (10.72)
7/16
0.438 (11.13)
－
0.444 (11.28)
3/8
9/16
0.562 (14.27)
37/64
0.578 (14.68)
37/64
0.578 (14.68)
1/2
11/16
0.688 (17.48)
45/64
0.703 (17.86)
23/32
0.719 (18.26)
3/4
57/64
0.891 (22.63)
59/64
0.922 (23.42)
－
0.922 (23.42)
1
1 1/8
1.125 (28.58)
1 5/32
1.156 (29.36)
1 5/32
1.156 (29.36)
1 1/4
1 15/32
1.469 (37.31)
1 1/2
1.500 (38.10)
－
－
1 1/2
1 45/64
1.703 (43.26)
1 47/64
1.734 (44.04)
－
－
2
2 3/16
2.188 (55.58)
2 7/32
2.219 (56.36)
－
－
2 1/2
2 19/32
2.594 (65.89)
2 41/64
2.641 (67.08)
－
－
上述鑽頭直徑來源於美制管用耐密斜行螺紋ANSI B1.20.3—1957 Dryseal Pipe Threads (Inch)標準
8、公制螺紋(NRT) (單位：mm)
螺紋尺寸
1級螺紋用下孔徑
2級螺紋用下孔徑
RH
精度
最小～最大
(嵌合率％)
RH
精度
最小～最大
(嵌合率％)
M 1 ×0.25
2
0.87 ~ 0.89 (100~85)
4
0.90 ~0.92 (100~80)
1.1×0.25
2
0.97 ~ 0.99 (100~85)
4
1.00 ~1.02 (100~80)
1.2×0.25
2
1.07 ~ 1.09 (100~85)
4
1.10 ~1.12 (100~80)
1.4×0.3
2
1.244~ 1.263 (100~85)
4
1.270~ 1.294 (100~80)
1.7×0.35
2
1.51 ~ 1.54 (100~80)
4
1.54 ~ 1.58 (100~75)
2 ×0.4
2
1.78 ~ 1.82 (100~80)
4
1.81 ~ 1.85 (100~75)
2.3×0.4
2
2.08 ~ 2.12 (100~80)
4
2.11 ~ 2.15 (100~75)
2.5×0.45
2
2.25 ~ 2.29 (100~80)
4
2.28 ~ 2.33 (100~75)
2.6×0.45
2
2.35 ~ 2.39 (100~80)
4
2.38 ~ 2.43 (100~75)
3 ×0.5
3
2.74 ~ 2.78 (100~80)
5
2.76 ~ 2.81 (100~75)
3.5×0.6
3
3.18 ~ 3.21 (100~85)
5
3.20 ~ 3.26 (100~75)
4 ×0.7
4
3.63 ~ 3.67 (100~85)
6
3.65 ~ 3.70 (100~85)
5 ×0.8
4
4.57 ~ 4.62 (100~85)
6
4.59 ~ 4.66 (100~80)
6 ×1
4
5.45 ~ 5.51 (100~85)
7
5.48 ~ 5.57 (100~80)
7 ×1
4
6.45 ~ 6.51 (100~85)
7
6.48 ~ 6.57 (100~80)
8 ×1.25
5
7.31 ~ 7.38 (100~85)
7
7.34 ~ 7.41 (100~85)
8 ×1
4
7.45 ~ 7.51 (100~85)
7
7.48 ~ 7.57 (100~80)
10 ×1.5
5
9.16 ~ 9.22 (100~90)
7
9.18 ~ 9.28 (100~85)
10 ×1.25
5
9.31 ~ 9.38 (100~85)
7
9.34 ~ 9.41 (100~85)
10 ×1
5
9.46 ~ 9.52 (100~85)
7
9.48 ~ 9.57 (100~80)
12 ×1.75
5
11.01 ~11.08 (100~90)
8
11.05 ~11.15 (100~85)
12 ×1.5
5
11.16 ~11.22 (100~90)
7
11.18 ~11.28 (100~85)
12 ×1.25
5
11.31 ~11.38 (100~85)
7
11.34 ~11.41 (100~85)
12 ×1
5
11.46 ~11.52 (100~85)
7
11.48 ~11.57 (100~80)
14 ×2
6
12.83 ~12.95 (100~90)
10
12.92 ~13.04 (100~85)
14 ×1.5
5
13.16 ~13.22 (100~90)
9
13.21 ~13.30 (100~85)
16 ×2
6
14.87 ~14.95 (100~90)
10
14.92 ~15.04 (100~85)
16 ×1.5
5
15.16 ~15.22 (100~90)
9
15.21 ~15.30 (100~80)
18 ×2.5
6
16.57 ~16.67 (100~90)
11
16.63 ~16.78 (100~85)
18 ×1.5
6
17.17 ~17.23 (100~90)
10
17.22 ~17.31 (100~85)
20 ×2.5
6
18.57 ~18.67 (100~90)
11
18.63 ~18.78 (100~85)
20 ×1.5
6
19.17 ~19.23 (100~90)
10
19.22 ~19.31 (100~85)
9、美制粗牙螺紋(NRT) (單位：mm)
螺紋尺寸
2B級螺紋用下孔徑
3B級螺紋用下孔徑
RH
精 度
最小～最大
(嵌合率％)
RH
精 度
最小～最大
(嵌合率％)
NO. 2-56UNC
4
1.96 ~ 2.02 (100~65)
3
1.95 ~ 2.01 (100~65)
3-48
4
2.25 ~ 2.32 (100~65)
3
2.23 ~ 2.31 (100~65)
4-40
5
2.52 ~ 2.60 (100~70)
3
2.50 ~ 2.58 (100~70)
5-40
5
2.86 ~ 2.93 (100~70)
3
2.83 ~ 2.91 (100~70)
6-32
5
3.09 ~ 3.17 (100~75)
3
3.06 ~ 3.14 (100~75)
8-32
6
3.75 ~ 3.83 (100~75)
4
3.74 ~ 3.82 (100~75)
10-24
6
4.26 ~ 4.35 (100~80)
4
4.24 ~ 4.32 (100~80)
12-24
6
4.92 ~ 5.01 (100~80)
4
4.90 ~ 4.96 (100~85)
1/4 -20
6
5.66 ~ 5.76 (100~80)
4
5.64 ~ 5.74 (100~80)
5/16 -18
7
7.18 ~ 7.29 (100~80)
5
7.15 ~ 7.24 (100~85)
3/8 -16
7
8.66 ~ 8.78 (100~80)
5
8.63 ~ 8.73 (100~85)
7/16 -14
7
10.11 ~10.25 (100~80)
5
10.08 ~10.19 (100~85)
1/2 -13
8
10.62 ~11.78 (100~80)
6
11.60 ~11.68 (100~90)
9/16 -12
10
13.14 ~13.27 (100~85)
8
13.11 ~13.24 (100~85)
5/8 -11
11
14.62 ~14.76 (100~85)
8
14.58 ~14.67 (100~90)
3/4 -10
12
17.67 ~17.88 (100~80)
9
17.63 ~17.74 (100~90)
7/8 - 9
12
20.68 ~20.85 (100~85)
9
20.64 ~20.75 (100~90)
1 - 8
13
23.65 ~23.84 (100~85)
10
23.61 ~23.74 (100~90)

二、螺紋下孔徑表(無屑絲攻用)
1、美制細牙螺紋(NRT) (單位：mm)
螺紋尺寸
2B級螺紋用下孔徑
3B級螺紋用下孔徑
RH
精 度
最小～最大
(嵌合率％)
RH
精 度
最小～最大
(嵌合率％)
NO. 2-64UNF
3
1.98 ~ 2.04 (100~65)
2
1.97 ~ 2.03 (100~65)
3-56
4
2.29 ~ 2.35 (100~65)
3
2.28 ~ 2.34 (100~65)
4-48
4
2.57 ~ 2.64 (100~70)
3
2.56 ~ 2.63 (100~70)
5-44
4
2.88 ~ 2.95 (100~70)
3
2.87 ~ 2.94 (100~70)
6-40
5
3.19 ~ 3.26 (100~70)
3
3.16 ~ 3.22 (100~75)
8-36
5
3.80 ~ 3.88 (100~75)
4
3.79 ~ 3.86 (100~75)
10-32
5
4.41 ~ 4.48 (100~80)
4
4.40 ~ 4.46 (100~80)
12-28
5
5.00 ~ 5.08 (100~80)
4
4.99 ~ 5.06 (100~80)
1/4 -28
5
5.86 ~ 5.93 (100~80)
4
5.85 ~ 5.92 (100~80)
5/16-24
6
7.38 ~ 7.46 (100~80)
5
7.36 ~ 7.43 (100~85)
3/8 -24
6
8.96 ~ 9.05 (100~80)
5
8.95 ~ 9.02 (100~85)
7/16-20
7
10.44 ~10.54 (100~80)
5
10.41 ~10.49 (100~85)
1/2 -20
7
12.02 ~12.12 (100~80)
5
12.00 ~12.05 (100~90)
9/16-18
9
13.55 ~13.66 (100~80)
7
13.