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IMPERIAL SIZES - BS GRADES
BS Grade A
28 tsi (432 Mpa)
BS Grade S
50 tsi (772 Mpa)
Unified Coarse (UNC) - Torques in Nm.
Size
1/4"
Threads/inch
20
2
T/Stress area (mm )
20.5 33.8
BS Grade A
BS Grade S
12
BS Grade T
12
BS Grade V
16
Unified Fine (UNF) up to 1", and UN-8 TPI for dia 1 1/8" and above. Torques in Nm.
Size
1/4"
Threads/inch
28
2
T/Stress area (mm )
23.5
BS Grade A
5
BS Grade S
13
BS Grade T
14
BS Grade V
17
IMPERIAL SIZES - SAE GRADES
SAE Grade 1
26.8 tsi (414 Mpa)
SAE Grade 5 (1 1/8" - 1 1/2")
46.9 tsi (724 Mpa)
Unified Coarse (UNC) - Torques in Nm.
Size
1/4"
Threads/inch
20
2
T/Stress area (mm )
20.5 33.8
SAE Grade 1
4
SAE Grade 5
11
SAE Grade 8
16
Unified Fine (UNF) up to 1", and UN-8 TPI for dia 1 1/8" and above. Torques in Nm.
Size
1/4"
Threads/inch
28
2
T/Stress area (mm )
23.5
SAE Grade 1
5
SAE Grade 5
12
SAE Grade 8
17
RESEARCH AND DEVELOPMENT
6
Manufacturer's
Mark
Coarse
C A
Grade
or Fine
Manufacturer's
Mark
Coarse
F A
Grade
or Fine
5/16"
3/8"
7/16"
18
16
14
50
68.6 91.5
4
9
16
25
24
43
66
26
45
72
31
55
90
5/16"
3/8" 7/16"
24
24
20
37.4
56.6 76.6
10
18
29
26
48
78
29
51
84
35
60
96
Manufacturer's
Mark
Manufacturer's
Mark
5/16"
3/8"
7/16"
18
16
14
50
68.6 91.5
9
16
25
22
40
62
32
57
92
5/16" 3/8"
7/16"
24
24
20
37.4
56.6 76.6
10
18
29
25
45
73
36
62
99
Drawing Number 700999/2 rev A
24/6/96
BS Grade T
55 tsi (849 Mpa)
BS Grade V
65 tsi (1004 Mpa)
1/2"
9/16" 5/8"
3/4"
13
12
11
10
117.4 146
215
38
56
78
138
108
150
209
371
114
162
221
383
138
191
263
479
1/2"
9/16"
5/8"
3/4"
20
18
18
16
103
131
165
241
43
60
90
150
114
167
233
407
126
179
239
431
150
215
299
526
SAE Grade 5 (1/4" - 1")
53.6 tsi (828 Mpa)
SAE Grade 8
67 tsi (1035 Mpa)
1/2"
9/16"
5/8"
3/4"
13
12
11
10
117.4 146
215
38
56
78
138
101
140
196
348
142
197
271
493
1/2"
9/16"
5/8"
3/4"
20
18
18
16
103
131
165
241
43
60
90
150
107
157
219
382
154
222
308
543
Coarse
C T
or Fine
Coarse
F V
or Fine
7/8"
1"
1 1/8" 1 1/4" 1 3/8" 1 1/2"
9
8
7
7
298
391
492
625
221
335
467
670
586
885
1256
1735
646
957
1376
1914
766
1148
1615
2273
7/8"
1"
1 1/8" 1 1/4" 1 3/8" 1 1/2"
14
12
8
8
328
428
510
645
239
359
490
670
646
957
1316
1794
694
1029
1376
1974
837
1256
1675
2393
Manufacturer's
Mark
Manufacturer's
Mark
7/8"
1"
1 1/8" 1 1/4" 1 3/8" 1 1/2"
9
8
7
7
298
391
492
625
335
221
467
670
550
830
1347
1860 2501 3270
789
1184
1665
2343 3083 4131
7/8"
1"
1 1/8" 1 1/4" 1 3/8" 1 1/2"
14
12
8
8
328
428
510
645
239
359
490
670
606
898
1411
1924
863
1295
1726
2466
June 1, 1999
Manufacturer's
Mark
Grade
Manufacturer's
Mark
Grade
6
6
745
906
861
1148
2333
3051
2512
3290
2991
4008
8
8
795
963
933
1196
2452
3230
2632
3529
3230
4247
6
6
745
906
861 1148
8
8
795
963
933
1196
2629
3463
3329
4378
X000385
870984-01
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