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GB/T 5356-2008
Standard hexagon socket screw keys
Nom
s max
s min
e max
e min
L1 max
L1 min
L2 max
L2 min
0.7
0.71
0.70
0.79
0.76
33
31
7
5
0.9
0.89
0.88
0.99
0.96
33
31
11
9
1.3
1.27
1.24
1.42
1.37
41
39
13
11
1.5
1.50
1.48
1.68
1.63
46.5
44.5
15.5
13.5
2
2.00
1.96
2.25
2.18
52
50
18
16
2.5
2.50
2.46
2.82
2.75
58.5
54.5
20.5
18.5
3
3.00
2.96
3.39
3.31
66
62
23
21
3.5
3.50
3.45
3.96
3.91
69.5
65.5
25.5
23.5
4
4.00
3.95
4.53
4.44
74
70
29
27
4.5
4.50
4.45
5.10
5.04
80
76
30.5
28.5
5
5.00
4.95
5.67
5.58
85
81
33
31
6
6.00
5.95
6.81
6.71
96
92
38
36
7
7.00
6.94
7.94
7.85
102
96
41
39
8
8.00
7.94
9.09
8.97
108
102
44
42
9
9.00
8.94
10.23
10.10
114
108
47
45
10
10.00
9.94
11.37
11.23
122
116
50
48
11
11.00
10.89
12.51
12.31
129
123
53
51
12
12.00
11.89
13.65
13.44
137
131
57
55
13
13.00
12.89
14.79
14.56
145
138
63
60
14
14.00
13.89
15.93
15.70
154
147
70
67
15
15.00
14.89
17.07
16.83
161
154
73
70
16
16.00
15.89
18.21
17.97
168
161
76
73
17
17.00
16.89
19.35
19.09
177
170
80
77
18
18.00
17.89
20.49
20.21
188
181
84
81
19
19.00
18.87
21.63
21.32
199
192
89
86
21
21.00
20.87
23.91
23.58
211
199
96
91
22
22.00
21.87
25.05
24.71
222
210
102
97
23
23.00
22.87
26.16
25.86
233
221
108
103
24
24.00
23.87
27.33
26.97
248
236
114
109
27
27.00
26.87
30.75
30.36
277
265
127
122
29
29.00
28.87
33.03
32.59
311
299
141
136
30
30.00
29.87
34.17
33.75
315
303
142
137
32
32.00
31.84
36.45
35.98
347
335
157
152
36
36.00
35.84
41.01
40.50
391
379
176
171
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