Designation: A 53/A 53M – 00
An American National Standard
Standard Speciﬁcation for
Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and
This standard is issued under the ﬁxed designation A 53/A 53M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (
) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1.1 This speciﬁcation
covers seamless and welded black
and hot-dipped galvanized steel pipe in NPS
to NPS 26 [DN
6 to DN 650] (Note 1), inclusive, with nominal wall thickness
(Note 2) as given in Table X2.2 and Table X2.3. It shall be
permissible to furnish pipe having other dimensions (Note 2)
provided such pipe complies with all other requirements of this
1—The dimensionless designators NPS (nominal pipe size) [DN
(diameter nominal)] have been substituted in this speciﬁcation for such
traditional terms as “nominal diameter,” “size,” and “nominal size.”
2—The term nominal wall thickness has been assigned for the
purpose of convenient designation, existing in name only, and is used to
distinguish it from the actual wall thickness, which may vary over or
under the nominal wall thickness.
1.2 This speciﬁcation covers the following types and
—Furnace-butt welded, continuous welded
—Electric-resistance welded, Grades A and B,
—Seamless, Grades A and B.
3—See Appendix X1 for deﬁnitions of types of pipe.
1.3 Pipe ordered under this speciﬁcation is intended for
mechanical and pressure applications and is also acceptable for
ordinary uses in steam, water, gas, and air lines. It is suitable
for welding, and suitable for forming operations involving
coiling, bending, and ﬂanging, subject to the following quali-
1.3.1 Type F is not intended for ﬂanging.
1.3.2 When Types S and E are required for close coiling or
cold bending, Grade A is the preferred grade. This provision is
not intended to prohibit the cold bending of Grade B pipe.
1.3.3 Type E is furnished either nonexpanded or cold
expanded at the option of the manufacturer.
1.4 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance
with the standard.
1.5 The following precautionary caveat pertains only to the
test method portion, Sections 9, 10, 11, 15, 16, and 17 of this
This standard does not purport to address all of
the safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.