G-SERIES PIPE THREAD (BRITISH
STANDARD PIPE PARALLEL was BSPP & BSPF)
PF-SERIES PIPE THREAD (JAPANESE PIPE PARALLEL)
British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF)
Thread
Designation
Nominal
Size
Thread
Form
Type
Major
Diameter
mm
d=D
Pitch
mm
p
Threads
per
inch
Pitch
Diameter
mm
d2=D2
Minor
Diameter
Male Thd.
d3
Thread
Height
H1
Tap
Drill
Diameter
mm
G1/8
1/8"
BSPP
9.728
0.907
28
9.147
8.566
0.581
8.70
G1/4
1/4"
BSPP
13.157
1.337
19
12.301
11.445
0.856
11.60
G3/8
3/8"
BSPP
16.662
1.337
19
15.806
14.950
0.856
15.00
G1/2
1/2"
BSPP
20.955
1.814
14
19.793
18.631
1.162
19.00
G5/8
5/8"
BSPP
22.911
1.814
14
21.749
20.587
1.162
20.75
G3/4
3/4"
BSPP
26.441
1.814
14
25.279
24.117
1.162
24.50
G7/8
7/8"
BSPP
30.201
1.814
14
29.039
27.877
1.162
28.00
G1
1"
BSPP
33.249
2.309
11
31.770
30.291
1.479
30.50
G1-1/8
1-1/8"
BSPP
37.897
2.309
11
36.418
34.939
1.479
35.00
G1-1/4
1-1/4"
BSPP
41.910
2.309
11
40.431
38.952
1.479
39.50
G1-3/8
1-3/8"
BSPP
44.323
2.309
11
42.844
41.365
1.479
41.50
G1-1/2
1-1/2"
BSPP
47.803
2.309
11
46.324
44.845
1.479
45.00
G1-3/4
1-3/4"
BSPP
53.746
2.309
11
52.267
50.788
1.479
51.00
G2
2"
BSPP
59.614
2.309
11
58.135
56.656
1.479
57.00
G2-1/4
2-1/4"
BSPP
65.71
2.309
11
64.231
62.752
1.479
63.00
G2-1/2
2-1/2"
BSPP
75.184
2.309
11
73.705
72.226
1.479
72.50
G2-3/4
2-3/4"
BSPP
81.534
2.309
11
80.055
78.576
1.479
79.00
3
3"
BSPP
87.884
2.309
11
86.405
84.926
1.479
85.50
G3-1/4
3-1/4"
BSPP
93.98
2.309
11
92.501
91.022
1.479
91.00
G3-1/2
3-1/2"
BSPP
100.33
2.309
11
98.351
97.372
1.479
97.75
G3-3/4
3-3/4"
BSPP
106.68
2.309
11
105.201
103.722
1.479
104.00
G4
4"
BSPP
113.03
2.309
11
111.55
110.072
1.479
110.50
G4-1/2
4-1/2"
BSPP
125.73
2.309
11
124.251
122.772
1.479
123.00
G5
5"
BSPP
138.43
2.309
11
136.951
135.472
1.479
136.00
G5-1/2
5-1/2"
BSPP
151.13
2.309
11
149.651
148.172
1.479
148.50
G6
6"
BSPP
163.83
2.309
11
162.351
160.872
1.479
161.50
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: ISO 228; 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
Gage Crib Worldwide, Inc.
6701 Old 28th St SE, Suite B
Grand Rapids, MI 49546-6937
Phone: 001-616-954-6581 • Fax: 001-616-954-6583 CONTACT FORMS & INFO
