ASTM A74 standard specification

– 09 Standard Specification for and Fittings

ASTM A74 standard covers cast gray iron soil pipe and fittings for use in gravity flow plumbing, drain, waste and vent sanitary, and storm water applications. These pipe and fittings are not intended for pressure applications. The cast iron shall be produced by an established commercial method that provides control over chemical and physical properties. Castings shall be sound, true to pattern, and of compact close grain that permits drilling and cutting by ordinary methods and its interior surface shall be reasonably smooth and free from defects. Ferrous scrap, pig iron, and any recycled ferrous material to be used in the melting operation shall be screened for radioactivity. Tension test shall include breaking load, machined diameter, and tensile strength. Chemical test shall conform to the chemical composition requirements prescribed for phosphorous, sulfur, chromium, titanium, aluminum, lead, and carbon equivalent. Dimension requirements for hub, spigot, barrel, grooves, water seal and trap, and threads of the pipe and fittings are detailed. The pipe and fittings shall be uniformly coated with a material suitable for the purpose.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.


1. This specification covers cast iron soil pipe and fittings for use in gravity flow plumbing, drain, waste and vent sanitary, and storm water applications. It establishes standards covering material, manufacture, mechanical and chemical properties, coating, test methods, inspection, certification, product markings, dimensions, and dimensional tolerances for extra heavy and service cast iron soil pipe and fittings. These pipe and fittings are not intended for pressure applications as the selection of the proper size for sanitary drain, waste, vent, and storm drain systems allows free air space for gravity drainage.

2. This specification covers pipe and fittings of the following patterns and, when so designated, shall apply to any other patterns that conform with the applicable requirements given in this specification.

2.1 Pipe:

Extra heavy, 2½ ft (0.75 m), 3½ft (1.0 m), 5 ft (1.5 m), 10 ft (3.0 m) lengths 1, 2
Service, 2½ ft (0.75 m), 3½ft (1.0 m), 5 ft (1.5 m), 10 ft (3.0 m) 1, 2
Outside dimensions (for detailing) X1.1

2.2 Fittings

¼ bends; long ¼ bends 3, 4
¼ bends, long low-hub 5
¼ bends, low heel; high heel 6, 7
¼ bends, short sweep; long sweep 8
¼ bends, reducing long sweep 9
1/5 bends 10
1/6 bends 10
1/8 bends; long 1/8 bends 11
1/16 bends 11
Y branches 12, 13
Y branches, combination 1/8 bends, single 14
Y branches, combination 1/8 bends, double 14
Sanitary T branches, single 15
Sanitary T branches, double 15
Sanitary T branches, cleanout 16
Tapped sanitary T branches, single 17
Tapped sanitary T branches, double 17
T branches, single and double 18
Tapped T branches, single 19
Tapped T branches, double 19
T branches, cleanout 20
-45° offset fitting 21
Double hubs 22
Long double hubs 22
Reducers 23
Increasers 24, 25
P traps 26, 27
Deep seal P traps 28
Running traps 29
Screw plugs (brass) 30
Blind plugs 31
Iron-body ferrules 32
Side inlets Fig. 3
Closet bends 33
Tapping bosses 34
Reducing ¼ bend SV 35
Combination Y and 1/8 bend 36
‘H’ branch fitting 37

3. The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

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