BS 143 & 1256:1986

Foreword
Committees responsible
Specification
1 Scope
2 Definitions
3 Types of fittings and symbols
4 Designation of fitting size
5 Size range
6 Pressure/temperature ratings
7 Dimensions and tolerances
8 Threads
9 Materials
10 Design
11 Testing and inspection
12 Test certificate
13 Marking
Appendices
A Information to be supplied by the purchaser
B Relationship between fitting size and nominal size
    (DN)
C Effect of non-metallic materials on water quality
Tables
1 Index of fitting types, symbols and index to tables
2 Pressure/temperature ratings
3 Minimum wall thickness
4 Minimum dimensions of reinforcement
5 Minimum depth of spanner flats
6 Tolerance on length
7 Jointing threads
8 Design test pressures
9 Elbows A1, male and female elbows A4, tees B1 and
    crosses C1
10 Elbows, reducing A1, male and female elbows,
    reducing A4
11 45 deg elbows A1/45 deg, 45 deg male and female
    elbows A4/45 deg
12 Tees, reducing on the branch B1, tees, increasing
    on the branch B1
13 Tees, reducing on the run and the branch B1, tees,
    reducing on the run and equal on the branch B1
14 Bends D1, male and female bends D4, male bends D8,
    pitcher tees E1, twin elbows E2
15 45 deg male and female bends D4/45 deg
16 Pitcher tees, reducing on the branch E1, pitcher
    tees, reducing on the run E1, pitcher tees,
    reducing on the branch and run E1
17 Long sweep bends G1, male and female long sweep
    bends G4
18 Return bends Kb1
19 Sockets M2, sockets, reducing M2, sockets,
    eccentric, reducing M3, male and female sockets,
    reducing M4
20 Bushes N4
21 Hexagon nipples N8, hexagon nipples reducing N8
22 Backnuts P4
23 Hexagon caps T1, round caps T2, plain plugs T8,
    beaded plugs T9, countersunk plugs T11, and
    alternative slotted head plugs for sizes 5 and 6
24 Unions flat seat U1, unions, taper seat U11, male
    and female unions, taper seat U12
25 Elbow unions, taper seat UA11, male and female
    elbow unions, taper seat UA12
26 Gaskets for unions flat seat U1
27 Thread designation and nominal size (DN)
Figures
1 Method of specifying outlets of fittings having more
    than two outlets
2 Forms of reinforcement

Requirements for design and performance of pipe fittings for designs to: (a) BS 143 having taper external and taper internal threads; and (b) BS 1256 having taper external and parallel internal threads.