ASTM A865/A865M-06(2017)
(Specification)Standard Specification for Threaded Couplings, Steel, Black or Zinc-Coated (Galvanized) Welded or Seamless, for Use in Steel Pipe Joints
Standard Specification for Threaded Couplings, Steel, Black or Zinc-Coated (Galvanized) Welded or Seamless, for Use in Steel Pipe Joints
ABSTRACT
This guide covers standard specification for black or galvanized welded or seamless threaded steel couplings for use with steel pipe joints in NPS 1/8 to NPS 20 [DN 6 to DN 500] inclusive. The steel for both welded and seamless couplings shall be made by one or more of the following processes: open-hearth, electric-furnace, or basic-oxygen. Welded couplings NPS 3½ [DN 90] and under may be butt-welded. Welded couplings over NPS 3½ [DN 90] shall be electric-welded. The steel shall conform to the required chemical composition for phosphorus and sulfur.
SCOPE
1.1 This specification covers black or galvanized welded or seamless threaded steel couplings for use with steel pipe in NPS 1/8 to NPS 20 [DN 6 to DN 500] inclusive (Note 1). Couplings ordered under this specification are intended for the uses outlined in the pipe specifications referencing this specification.
Note 1: The dimensionless designator NPS (nominal pipe size) and DN [diameter nominal] has been substituted in this standard for such traditional terms as nominal diameter, size, and nominal size.
1.2 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.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A865/A865M − 06 (Reapproved 2017)
Standard Specification for
Threaded Couplings, Steel, Black or Zinc-Coated
(Galvanized) Welded or Seamless, for Use in Steel Pipe
Joints
This standard is issued under the fixed designation A865/A865M; 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.
1. Scope Magnetic-Field or Eddy Current (Electromagnetic) Test-
ing Methods
1.1 This specification covers black or galvanized welded or
2.2 ANSI Standard:
seamless threaded steel couplings for use with steel pipe in
B 1.20.1 Pipe Threads
NPS ⁄8 to NPS 20 [DN 6 to DN 500] inclusive (Note 1).
2.3 API Standards:
Couplings ordered under this specification are intended for the
5B Specification for Threading, Gaging, and Thread Inspec-
uses outlined in the pipe specifications referencing this speci-
tion of Casing, Tubing, and Line Pipe Threads
fication.
5L Specification for Line Pipe
NOTE 1—The dimensionless designator NPS (nominal pipe size) and
DN [diameter nominal] has been substituted in this standard for such
3. Ordering Information
traditional terms as nominal diameter, size, and nominal size.
3.1 Orders for material under this specification should
1.2 The values stated in either SI units or inch-pound units
include the following, as required, to describe the desired
are to be regarded separately as standard. The values stated in
material adequately:
each system may not be exact equivalents; therefore, each
3.1.1 Specification number,
system shall be used independently of the other. Combining
3.1.2 Quantity (pieces),
values from the two systems may result in non-conformance
3.1.3 Name of material (steel pipe-couplings),
with the standard.
3.1.4 Method of manufacture (welded or seamless),
1.3 This international standard was developed in accor-
3.1.5 Finish (black or Type I or Type II) galvanized (see
dance with internationally recognized principles on standard-
8.1),
ization established in the Decision on Principles for the
3.1.6 Size (NPS designator [DN]),
Development of International Standards, Guides and Recom-
3.1.7 Standard or extra-strong classification,
mendations issued by the World Trade Organization Technical
3.1.8 Taper tapped-couplings for NPS 2 [DN 50] and
Barriers to Trade (TBT) Committee.
smaller, either recessed or non-recessed, if desired, and
3.1.9 Certification (see 11.3), if required.
2. Referenced Documents
2 4. Process
2.1 ASTM Standards:
4.1 The steel for both welded and seamless couplings shall
A700 Guide for Packaging, Marking, and Loading Methods
be made by one or more of the following processes: open-
for Steel Products for Shipment
hearth, electric-furnace, or basic-oxygen.
B6 Specification for Zinc
E376 Practice for Measuring Coating Thickness by 1
4.2 Welded couplings NPS 3 ⁄2 [DN 90] and under may be
butt-welded, unless otherwise specified. Welded couplings
over NPS 3 ⁄2 [DN 90] shall be electric-welded.
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
5. Chemical Composition
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.22 on Steel Forgings and Wrought Fittings for Piping Applications and Bolting
5.1 The steel shall conform to the chemical composition
Materials for Piping and Special Purpose Applications.
requirements as specified in Table 1.
Current edition approved Sept. 1, 2017. Published October 2017. Originally
approved in 1986. Last previous edition approved in 2012 as A865/A865M – 06
(2012). DOI: 10.1520/A0865_A0865M-06R17.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM 4th Floor, New York, NY 10036.
Standards volume information, refer to the standard’s Document Summary page on Available from American Petroleum Institute (API), 1220 L. St., NW,
the ASTM website. Washington, DC 20005.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A865/A865M − 06 (2017)
TABLE 1 Chemical Requirements
8.3.1 The weight of the zinc coating on the outside surface
Composition, max % of the electrogalvanized couplings shall be equivalent to 0.18
2 2
Phosphorus Sulfur oz/ft [55 g/m ] (see also 8.2.2)
All processes 0.14 0.35
8.4 Sampling—Samples of couplings sufficient to determine
their conformance with the requirements of this specification,
shall be taken at random for each lot of couplings of the same
size.
6. Dimensions
6.1 Coupling dimensions are listed in Tables 2-4 and Figs.
9. Threading
1-3.
9.1 The coupling threads shall be in accordance with ANSI
7. Permissible Variations in Dimensions
B 1.20.1. The couplings shall be applied handling tight, unless
1 power tight is specified on the order. Taper-tapped couplings
7.1 Diameter—For couplings NPS 1 ⁄2 [DN 40] and under,
shall be furnished on all weights of pipe NPS 2 ⁄2 [DN 65] and
the outside diameter at any point shall not vary more than
1 1 larger. For sizes NPS 2 [DN 50] and smaller, it is regular
⁄64 in. [0.4 mm] over nor more than ⁄32 in. [0.8 mm] under the
practice to furnish straight-tapped couplings for standard
standard specified. For couplings NPS 2 [DN 50] and over, the
weight pipe and taper-tapped couplings for extra-strong and
outside diameter shall not vary more than 61 % from the
double-extra-strong pipe. Taper-tapped couplings may be
standard specified.
specified for pipe sizes NPS 2 [DN 50] and under. Taper-tapped
7.2 Threads—The variation of the threads shall not exceed
couplings furnished for standard-weight pipe may be nonre-
61 ⁄2 turns for straight tapped and 61 turn for taper tapped
cessed (see Table 3) or recessed (see Table 4). Couplings
from nominal as determined using gages and the gaging
furnished for extra-strong and double-extra strong pipe are
practices in ANSI B 1.20.1.
recessed. Recessed couplings (Table 4) conform to API Speci-
fication 5L.
8. Galvanized Couplings
8.1 Galvanized couplings may be coated with zinc by either
10. Finish
the hot-dipped (Type 1) or by the electrogalvanizing process.
10.1 The finished couplings shall be free of defects.
(Type II) as specified by the purchaser. The zinc used for the
coating shall be any grade of zinc conforming to Specification
10.2 The zinc coating on galvanized couplings shall be free
B6.
of voids or excessive roughness.
8.2 Hot-dipped galvanized couplings are coated prior to
11. Inspection and Certification
threading.
8.2.1 The minimum weight of the zinc coating on the
11.1 The inspector representing the purchaser shall have
outside surface of the hot-dipped galvanized couplings shall be
entry, at all times while work on the contract of the purchaser
2 2
equivalent to 1.6 oz/ft [490 g/m ].
is being performed, to all parts of the manufacturer’s works
8.2.2 The weight of the zinc coating on the outside surface
that concern the manufacture of the material ordered. The
shall be determined by the use of a magnetic thickness gage,
manufacturer shall afford the inspector all reasonable facilities
using the procedure in Practice E376 or using another method
to satisfy him that the material is being furnished in accordance
that is mutually agreed upon between the purchaser and the
with this specification. All tests and inspection shall be made at
manufacturer.
the place of manufacture prior to shipment, unless otherwise
8.3 Electrogalvanized couplings
...
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A865/A865M − 06 (Reapproved 2017)
Standard Specification for
Threaded Couplings, Steel, Black or Zinc-Coated
(Galvanized) Welded or Seamless, for Use in Steel Pipe
Joints
This standard is issued under the fixed designation A865/A865M; 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.
1. Scope Magnetic-Field or Eddy Current (Electromagnetic) Test-
ing Methods
1.1 This specification covers black or galvanized welded or
2.2 ANSI Standard:
seamless threaded steel couplings for use with steel pipe in
B 1.20.1 Pipe Threads
NPS ⁄8 to NPS 20 [DN 6 to DN 500] inclusive (Note 1).
2.3 API Standards:
Couplings ordered under this specification are intended for the
5B Specification for Threading, Gaging, and Thread Inspec-
uses outlined in the pipe specifications referencing this speci-
tion of Casing, Tubing, and Line Pipe Threads
fication.
5L Specification for Line Pipe
NOTE 1—The dimensionless designator NPS (nominal pipe size) and
DN [diameter nominal] has been substituted in this standard for such
3. Ordering Information
traditional terms as nominal diameter, size, and nominal size.
3.1 Orders for material under this specification should
1.2 The values stated in either SI units or inch-pound units
include the following, as required, to describe the desired
are to be regarded separately as standard. The values stated in
material adequately:
each system may not be exact equivalents; therefore, each
3.1.1 Specification number,
system shall be used independently of the other. Combining
3.1.2 Quantity (pieces),
values from the two systems may result in non-conformance
3.1.3 Name of material (steel pipe-couplings),
with the standard.
3.1.4 Method of manufacture (welded or seamless),
1.3 This international standard was developed in accor-
3.1.5 Finish (black or Type I or Type II) galvanized (see
dance with internationally recognized principles on standard-
8.1),
ization established in the Decision on Principles for the
3.1.6 Size (NPS designator [DN]),
Development of International Standards, Guides and Recom-
3.1.7 Standard or extra-strong classification,
mendations issued by the World Trade Organization Technical
3.1.8 Taper tapped-couplings for NPS 2 [DN 50] and
Barriers to Trade (TBT) Committee.
smaller, either recessed or non-recessed, if desired, and
3.1.9 Certification (see 11.3), if required.
2. Referenced Documents
4. Process
2.1 ASTM Standards:
4.1 The steel for both welded and seamless couplings shall
A700 Guide for Packaging, Marking, and Loading Methods
be made by one or more of the following processes: open-
for Steel Products for Shipment
hearth, electric-furnace, or basic-oxygen.
B6 Specification for Zinc
E376 Practice for Measuring Coating Thickness by
4.2 Welded couplings NPS 3 ⁄2 [DN 90] and under may be
butt-welded, unless otherwise specified. Welded couplings
over NPS 3 ⁄2 [DN 90] shall be electric-welded.
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
5. Chemical Composition
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.22 on Steel Forgings and Wrought Fittings for Piping Applications and Bolting
5.1 The steel shall conform to the chemical composition
Materials for Piping and Special Purpose Applications.
requirements as specified in Table 1.
Current edition approved Sept. 1, 2017. Published October 2017. Originally
approved in 1986. Last previous edition approved in 2012 as A865/A865M – 06
(2012). DOI: 10.1520/A0865_A0865M-06R17.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM 4th Floor, New York, NY 10036.
Standards volume information, refer to the standard’s Document Summary page on Available from American Petroleum Institute (API), 1220 L. St., NW,
the ASTM website. Washington, DC 20005.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A865/A865M − 06 (2017)
TABLE 1 Chemical Requirements
8.3.1 The weight of the zinc coating on the outside surface
Composition, max % of the electrogalvanized couplings shall be equivalent to 0.18
2 2
Phosphorus Sulfur oz/ft [55 g/m ] (see also 8.2.2)
All processes 0.14 0.35
8.4 Sampling—Samples of couplings sufficient to determine
their conformance with the requirements of this specification,
shall be taken at random for each lot of couplings of the same
size.
6. Dimensions
6.1 Coupling dimensions are listed in Tables 2-4 and Figs.
9. Threading
1-3.
9.1 The coupling threads shall be in accordance with ANSI
7. Permissible Variations in Dimensions
B 1.20.1. The couplings shall be applied handling tight, unless
1 power tight is specified on the order. Taper-tapped couplings
7.1 Diameter—For couplings NPS 1 ⁄2 [DN 40] and under,
shall be furnished on all weights of pipe NPS 2 ⁄2 [DN 65] and
the outside diameter at any point shall not vary more than
1 1 larger. For sizes NPS 2 [DN 50] and smaller, it is regular
⁄64 in. [0.4 mm] over nor more than ⁄32 in. [0.8 mm] under the
practice to furnish straight-tapped couplings for standard
standard specified. For couplings NPS 2 [DN 50] and over, the
weight pipe and taper-tapped couplings for extra-strong and
outside diameter shall not vary more than 61 % from the
double-extra-strong pipe. Taper-tapped couplings may be
standard specified.
specified for pipe sizes NPS 2 [DN 50] and under. Taper-tapped
7.2 Threads—The variation of the threads shall not exceed
couplings furnished for standard-weight pipe may be nonre-
61 ⁄2 turns for straight tapped and 61 turn for taper tapped
cessed (see Table 3) or recessed (see Table 4). Couplings
from nominal as determined using gages and the gaging
furnished for extra-strong and double-extra strong pipe are
practices in ANSI B 1.20.1.
recessed. Recessed couplings (Table 4) conform to API Speci-
fication 5L.
8. Galvanized Couplings
8.1 Galvanized couplings may be coated with zinc by either
10. Finish
the hot-dipped (Type 1) or by the electrogalvanizing process.
10.1 The finished couplings shall be free of defects.
(Type II) as specified by the purchaser. The zinc used for the
coating shall be any grade of zinc conforming to Specification
10.2 The zinc coating on galvanized couplings shall be free
B6.
of voids or excessive roughness.
8.2 Hot-dipped galvanized couplings are coated prior to
11. Inspection and Certification
threading.
8.2.1 The minimum weight of the zinc coating on the
11.1 The inspector representing the purchaser shall have
outside surface of the hot-dipped galvanized couplings shall be
entry, at all times while work on the contract of the purchaser
2 2
equivalent to 1.6 oz/ft [490 g/m ].
is being performed, to all parts of the manufacturer’s works
8.2.2 The weight of the zinc coating on the outside surface
that concern the manufacture of the material ordered. The
shall be determined by the use of a magnetic thickness gage,
manufacturer shall afford the inspector all reasonable facilities
using the procedure in Practice E376 or using another method
to satisfy him that the material is being furnished in accordance
that is mutually agreed upon between the purchaser and the
with this specification. All tests and inspection shall be made at
manufacturer.
the place of manufacture prior to shipment, unless otherwise
8.3 Electrogalvanized couplings are coated either before or specified, and shall be so conducted as not
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A865/A865M − 06 (Reapproved 2012) A865/A865M − 06 (Reapproved 2017)
Standard Specification for
Threaded Couplings, Steel, Black or Zinc-Coated
(Galvanized) Welded or Seamless, for Use in Steel Pipe
Joints
This standard is issued under the fixed designation A865/A865M; 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.
1. Scope*Scope
1.1 This specification covers black or galvanized welded or seamless threaded steel couplings for use with steel pipe in NPS
⁄8 to NPS 20 [DN 6 to DN 500] inclusive (Note 1). Couplings ordered under this specification are intended for the uses outlined
in the pipe specifications referencing this specification.
NOTE 1—The dimensionless designator NPS (nominal pipe size) and DN [diameter nominal] has been substituted in this standard for such traditional
terms as nominal diameter, size, and nominal size.
1.2 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.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
A700 Guide for Packaging, Marking, and Loading Methods for Steel Products for Shipment
B6 Specification for Zinc
E376 Practice for Measuring Coating Thickness by Magnetic-Field or Eddy-Current (Electromagnetic) Testing Methods
2.2 ANSI Standard:
B 1.20.1 Pipe Threads
2.3 API Standards:
5B Specification for Threading, Gaging, and Thread Inspection of Casing, Tubing, and Line Pipe Threads
5L Specification for Line Pipe
3. Ordering Information
3.1 Orders for material under this specification should include the following, as required, to describe the desired material
adequately:
3.1.1 Specification number,
3.1.2 Quantity (pieces),
3.1.3 Name of material (steel pipe-couplings),
3.1.4 Method of manufacture (welded or seamless),
3.1.5 Finish (black or Type I or Type II) galvanized (see 8.1),
3.1.6 Size (NPS designator [DN]),
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.09
on Carbon Steel Tubular Products.
Current edition approved March 1, 2012Sept. 1, 2017. Published November 2012October 2017. Originally approved in 1986. Last previous edition approved in 20062012
as A865A865/A865M – 06 (2012).-06. DOI: 10.1520/A0865_A0865M-12.10.1520/A0865_A0865M-06R17.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.
Available from American Petroleum Institute (API), 1220 L. St., NW, Washington, DC 20005.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A865/A865M − 06 (2017)
3.1.7 Standard or extra-strong classification,
3.1.8 Taper tapped-couplings for NPS 2 [DN 50] and smaller, either recessed or non-recessed, if desired, and
3.1.9 Certification (see 11.3), if required.
4. Process
4.1 The steel for both welded and seamless couplings shall be made by one or more of the following processes: open-hearth,
electric-furnace, or basic-oxygen.
4.2 Welded couplings NPS 3 ⁄2 [DN 90] and under may be butt-welded, unless otherwise specified. Welded couplings over NPS
3 ⁄2 [DN 90] shall be electric-welded.
5. Chemical Composition
5.1 The steel shall conform to the chemical composition requirements as specified in Table 1.
6. Dimensions
6.1 Coupling dimensions are listed in Tables 2-4 and Figs. 1-3.
7. Permissible Variations in Dimensions
1 1
7.1 Diameter—For couplings NPS 1 ⁄2 [DN 40] and under, the outside diameter at any point shall not vary more than ⁄64 in.
[0.4 mm] over nor more than ⁄32 in. [0.8 mm] under the standard specified. For couplings NPS 2 [DN 50] and over, the outside
diameter shall not vary more than 61 % from the standard specified.
7.2 Threads—The variation of the threads shall not exceed 61 ⁄2 turns for straight tapped and 61 turn for taper tapped from
nominal as determined using gages and the gaging practices in ANSI B 1.20.1.
8. Galvanized Couplings
8.1 Galvanized couplings may be coated with zinc by either the hot-dipped (Type 1) or by the electrogalvanizing process. (Type
II) as specified by the purchaser. The zinc used for the coating shall be any grade of zinc conforming to Specification B6.
8.2 Hot-dipped galvanized couplings are coated prior to threading.
8.2.1 The minimum weight of the zinc coating on the outside surface of the hot-dipped galvanized couplings shall be equivalent
2 2
to 1.6 oz/ft [490 g/m ].
8.2.2 The weight of the zinc coating on the outside surface shall be determined by the use of a magnetic thickness gage, using
the procedure in Practice E376 or using another method that is mutually agreed upon between the purchaser and the manufacturer.
8.3 Electrogalvanized couplings are coated either before or after threading.
8.3.1 The weight of the zinc coating on the outside surface of the electrogalvanized couplings shall be equivalent to 0.18
2 2
oz/ft [55 g/m ] (see also 8.2.2)
8.4 Sampling—Samples of couplings sufficient to determine their conformance with the requirements of this specification, shall
be taken at random for each lot of couplings of the same size.
9. Threading
9.1 The coupling threads shall be in accordance with ANSI B 1.20.1. The couplings shall be applied handling tight, unless
power tight is specified on the order. Taper-tapped couplings shall be furnished on all weights of pipe NPS 2 ⁄2 [DN 65] and larger.
For sizes NPS 2 [DN 50] and smaller, it is regular practice to furnish straight-tapped couplings for standard weight pipe and
taper-tapped couplings for extra-strong and double-extra-strong pipe. Taper-tapped couplings may be specified for pipe sizes NPS
2 [DN 50] and under. Taper-tapped couplings furnished for standard-weight pipe may be nonrecessed (see Table 3) or recessed (see
Table 4). Couplings furnished for extra-strong and double-extra strong pipe are recessed. Recessed couplings (Table 4) conform
to API Specification 5L.
10. Finish
10.1 The finished couplings shall be free of defects.
10.2 The zinc coating on galvanized couplings shall be free of voids or excessive roughness.
TABLE 1 Chemical Requirements
Composition, max %
Phosphorus Sulfur
All processes 0.14 0.35
A865/A865M − 06 (2017)
TABLE 2 Coupling Thread Dimension—Straight-Tapped (NPSC) for Standard Weight Pipe
Pitch diameter,
Outside diameter, Coupling min length,
NPS DN
in. [mm]
Threads/in. in. [mm] in. [mm]
Designator Designator
W N
L min max
1 3
⁄8 6 27 0.563 [14.3] ⁄4 [19] 0.370 [9.4] 0.377 [9.6]
1 1
⁄4 8 18 0.719 [18.3] 1 ⁄8 [29] 0.486 [12.3] 0.497 [12.6]
3 1
⁄8 10 18 0.875 [22.2] 1 ⁄8 [29] 0.622 [15.8] 0.632 [16.1]
1 1
⁄2 15 14 1.063 [27.0] 1 ⁄2 [38] 0.772 [19.6] 0.785 [19.9]
3 9
...
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