Whitworth Coarse Thread BS 84
BSW (British Standard Whitworth)
British Standard Whitworth Coarse Thread Series (parallel, cylindrical)
In GB most common Thread. Corresponds to the Metric Thread in its
type of use.
THREAD DATA CHART:
British Thread (British
Standard Whitworth) -- Coarse Pitch
Nominal
Size
Ww
Thread
Form
Type
Major
Diameter
mm
d=D
Pitch
mm
p
Threads
per
inch
tpi
Pitch
Diameter
mm
d2=D2
Minor
Diameter
Male Thd.
d3
Thread
Height
H1
Tap
Drill
Diameter
mm
1/16"
BSW
1.587
0.423
60
1.315
1.050
0.270
1.15
3/32"
BSW
2.381
0.529
48
2.041
1.703
0.338
1.90
1/8"
BSW
3.175
0.635
40
2.768
2.362
0.406
2.50
5/32"
BSW
3.969
0.793
32
3.459
2.952
0.507
3.20
3/16"
BSW
4.762
1.058
24
4.084
3.407
0.677
3.70
7/32"
BSW
5.556
1.058
24
4.878
4.201
0.677
4.50
1/4"
BSW
6.350
1.270
20
5.537
4.724
0.813
5.10
5/16"
BSW
7.938
1.411
18
7.034
6.131
0.904
6.50
3/8"
BSW
9.525
1.588
16
8.509
7.492
1.017
7.90
7/16"
BSW
11.113
1.814
14
9.951
8.789
1.162
9.20
1/2"
BSW
12.700
2.117
12
11.345
9.990
1.355
10.40
5/8"
BSW
15.876
2.309
11
14.397
12.918
1.479
13.40
3/4"
BSW
19.051
2.540
10
17.424
15.798
1.627
16.25
7/8"
BSW
22.226
2.822
9
20.419
18.611
1.807
19.25
1"
BSW
25.400
3.175
8
23.368
21.335
2.033
22.00
1-1/8"
BSW
28.576
3.629
7
26.253
23.929
2.324
24.50
1-1/4"
BSW
31.751
3.629
7
29.428
27.104
2.324
27.25
1-3/8"
BSW
34.926
4.233
6
32.215
29.505
2.711
30.25
1-1/2"
BSW
38.100
4.233
6
35.391
32.680
2.711
33.50
1-5/8"
BSW
41.277
5.080
5
38.024
34.771
3.253
35.50
1-3/4"
BSW
44.452
5.080
5
41.199
37.946
3.253
38.50
1-7/8"
BSW
47.627
5.645
4 1/2
44.012
40.398
3.614
41.25
2"
BSW
50.802
5.645
4 1/2
47.187
43.573
3.614
44.50
2-1/4"
BSW
57.152
6.350
4
53.086
49.020
4.066
50.00
2-1/2"
BSW
63.502
6.350
4
59.436
55.370
4.066
56.00
2-3/4"
BSW
69.853
7.257
3 1/2
65.205
60.558
4.647
61.50
3"
BSW
76.203
7.257
3 1/2
71.556
66.909
4.647
68.00
3-1/4"
BSW
82.553
7.816
3 1/4
77.548
72.544
5.005
73.75
3-1/2"
BSW
88.903
7.816
3 1/4
83.899
78.894
5.005
80.00
3-3/4"
BSW
95.254
8.467
3
89.832
84.410
5.422
85.50
4"
BSW
101.604
8.467
3
96.182
90.760
5.422
92.00
4-1/4"
BSW
107.954
8.835
2 7/8
102.297
96.639
5.657
98.00
4-1/2"
BSW
114.304
8.835
2 7/8
108.647
102.990
5.657
104.20
4-3/4"
BSW
120.665
9.237
2 3/4
114.740
108.625
5.915
110.00
5"
BSW
127.005
9.237
2 3/4
121.090
115.176
5.915
116.50
5-1/4"
BSW
133.355
9.677
2 5/8
127.159
120.963
6.196
122.50
5-1/2"
BSW
139.705
9.677
2 5/8
133.509
127.313
6.196
128.50
5-3/4"
BSW
146.055
10.160
2 1/2
139.549
133.043
6.506
134.50
6"
BSW
152.406
10.160
2 1/2
145.900
139.394
6.506
141.00
Disclaimer
This data is provided for general information only. The intention is to provide accurate information; regardless; errors may exist in the supplied information. If accuracy is critical, base your final decisions on the data provided in the root document: BS 84; which is a copyrighted document. To purchase a copy visit an Authorized Reseller.
Comments:
Original Posting: 2/28/2008
Last Revision: 2/12/2013
Error corrections in, or comments about, the above data can be sent to: office@gagecrib.com
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6701 Old 28th St SE, Suite B
Grand Rapids, MI 49546-6937
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