BS 1740-1:1971

Co-operating organizations
Foreword
Specification
1 Scope
2 Materials
3 Screwed ends of fittings
4 Method of specifying outlets
5 Dimensions and tolerances
6 Tests
7 Hot dip galvanizing
8 Certificate of compliance
Appendix
A Method of testing the zinc coating on galvanized
     steel pipe fittings (copper sulphate test)
Tables
1 Screwed end of fittings (internal parallel thread
     and external taper thread)
2 Elbows, tees and crosses, equal
3 Elbows, equal 45 degrees
4 Elbows, reducing
5 Elbows, male and female, equal
6 Tees, increasing on the branch
7 Tees, reducing (on the run and branch, or on the
     run only)
8 Tees, reducing on the branch
9 Sockets and half sockets, equal
10 Sockets, reducing
11 Socket unions
12 Caps
13 Plugs
14 Hexagon backnuts
15 Hexagon bushes
16 Nipples, hexagon, equal
Figures
1 50 mm x 80 mm tee
2 40 mm x 25 mm x 25 mm tee
3 Internal parallel thread (Rp)
4 External parallel thread (R)
5 Elbow, equal
6 Tee, equal
7 Cross, equal
8 Elbow, equal 45 degrees
9 Elbow, reducing
10 Elbow, male and female, equal
11 Tee, increasing on the branch
12 Tee, reducing on the run and branch
13 Tee, reducing on the run only
14 Tee, reducing on the branch
15 Standard socket
15A Half socket
16 Faced socket for longscrews (used in conjunction
     with backnut shown in Fig. 22 and appropriate
     thread sealant)
17 Socket, reducing
18 Socket union
19 Cap, flat
20 Cap, dome
21 Plugs
22 Backnut (used with socket shown in Fig. 16)
23 Bush
24 Hexagon nipple, equal

Welded and seamless fittings 6 mm to 150 mm, for use with steel tubes to BS 1387, screwed BSP thread to BS 21.