ASTM F704-81(2018)e1

Standard Practice for Selecting Bolting Lengths for Piping System Flanged Joints

ABSTRACT
This practice covers bolt and stud bolt lengths, quantities, and thread series for pipe to pipe and pipe to valve flanged joints. This specification presents tables of bolting lengths for different steel flanged joints.
SCOPE
1.1 This practice covers bolt and stud bolt lengths, quantities, and thread series for pipe to pipe and pipe to valve flanged joints (Note 1) in the nominal pipe size ranges of 1/2 through 48-in. (12.7 through 1219-mm) diameter and pressure range of 125 through 2500 psi (0.8 through 17 236 kPa).
Note 1: This is applicable when flange of valve has the same thickness as mating flange.  
1.2 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.  
1.3 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 appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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.

General Information

• Status: Historical
• Publication Date: 31-Aug-2018
• ICS: 21.060.10 - Bolts, screws, studs
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.11 - Machinery and Piping Systems

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
´1
Designation: F704 − 81 (Reapproved 2018) An American National Standard
Standard Practice for
Selecting Bolting Lengths for Piping System Flanged
Joints
ThisstandardisissuedunderthefixeddesignationF704;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
ε NOTE—Editorial corrections were made to Section 2 in September 2018.
1. Scope B16.5 Pipe Flanges and Flanged Fittings: NPS 1/2 through
NPS 24 Metric/Inch Standard
1.1 This practice covers bolt and stud bolt lengths,
B16.24 Cast Copper Alloy Pipe Flanges, Flanged Fittings,
quantities, and thread series for pipe to pipe and pipe to valve
and Valves: Classes 150, 300, 600, 900, 1500, and 2500
flanged joints (Note 1) in the nominal pipe size ranges of ⁄2
B18.2.1 Square, Hex, Heavy Hex, and Askew Head Bolts
through 48-in. (12.7 through 1219-mm) diameter and pressure
and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag
range of 125 through 2500 psi (0.8 through 17 236 kPa).
Screws (Inch Series)
NOTE1—Thisisapplicablewhenflangeofvalvehasthesamethickness
B18.2.2 Nuts for General Applications: Machine Screw
as mating flange.
Nuts, Hex, Square, Hex Flange, and Coupling Nuts (Inch
1.2 The values stated in inch-pound units are to be regarded
Series)
as standard. The values given in parentheses are mathematical
2.2 MSS Standards:
conversions to SI units that are provided for information only
MSS-SP-44 Steel Pipe Flanges
and are not considered standard.
3. Bolting Criteria
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1 Bolt and stud bolt lengths are computed using the
responsibility of the user of this standard to establish appro-
following (see Annex A1):
priate safety, health, and environmental practices and deter-
3.1.1 Includes maximum nut thickness in accordance with
mine the applicability of regulatory limitations prior to use.
ASME B18.2.2.
1.4 This international standard was developed in accor-
3.1.2 Does not include washer thickness.
dance with internationally recognized principles on standard-
3.1.3 Does not include bolt or stud bolt point height.
ization established in the Decision on Principles for the 1
3.1.4 Includes allowance for up to ⁄8-in. (3.2-mm) thick
Development of International Standards, Guides and Recom-
gaskets, except butterfly valves.
mendations issued by the World Trade Organization Technical 1
3.1.5 Includes ⁄4-in. (6.3-mm) raised face in addition to
Barriers to Trade (TBT) Committee.
flange thickness listed in tables for flanges rated at 400 psi (2.8
kPa) and above.
2. Referenced Documents
3.1.6 Includes use of heavy hex nut and bolt design.
2.1 ASME Standards:
3.1.7 Includes plus tolerance for flange thickness in accor-
B1.1 Unified Inch Screw Threads (UN and UNR Thread
dance with ASME B16.5.
Form)
3.2 All bolts and stud bolts have threads in accordance with
B16.1 Gray Iron Pipe Flanges and Flanged Fittings: Classes
ASME B1.1, Class 2A dimensioning and nuts Class 2B.
25, 125, and 250
3.3 The material requirements for bolts, stud bolts, and nuts
are obtained from the material specifications of individual
This practice is under the jurisdiction of ASTM Committee F25 on Ships and
system diagrams.
Marine Technology and is the direct responsibility of Subcommittee F25.11 on
Machinery and Piping Systems.
3.4 Alloy steel bolting 1-in. (25.4-mm) nominal diameter
Current edition approved Sept. 1, 2018. Published October 2018. Originally
and smaller and all carbon steel bolting has threads of the UNC
approved in 1981. Last previous edition approved in 2014 as F704 – 81 (2014).
DOI: 10.1520/F0704-81R18E01.
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Two Park Ave., New York, NY 10016-5990, http:// AvailablefromManufacturersStandardizationSocietyoftheValveandFittings
www.asme.org. Industry (MSS), 127 Park St., NE, Vienna, VA22180-4602, http://www.mss-hq.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F704 − 81 (2018)
Series; alloy steel bolting above 1-in. nominal diameter has
Bolting Lengths for Tapped Lug-Type Butterfly Valve Table 18
and 150 lb Bronze Flanges to ASME B16.24
threads of the 8-UN Series.
3.5 For detailed descriptions of flange bolting assemblies,
butterfly valve bolting assemblies, and tapped lug-type butter-
fly valve bolting assemblies, refer to Figs. 1–7.
5. Keywords
5.1 bolting lengths; cover bolt; flange joint(s); marine tech-
4. List of Tables
nology; ships; stud bolts
4.1 The tables are arranged in the following sequence:
150-lb Steel Flanged Joints Table 1
300-lb Steel Flanged Joints Table 2
400-lb Steel Flanged Joints Table 3
600-lb Steel Flanged Joints Table 4
900-lb Steel Flanged Joints Table 5
1500-lb Steel Flanged Joints Table 6
2500-lb Steel Flanged Joints Table 7
150-lb Bronze Flanged Joints Table 8
300-lb Bronze Flanged Joints Table 9
150-lb Steel Flat Face to 150-lb Bronze Flanged Table 10
Joints
300-lb Steel Flat Face to 300-lb Bronze Flanged Table 11
Joints
125-lb Cast Iron to 150-lb Steel Flat Face Flanged Table 12
Joints
250-lb Cast Iron to 300-lb Steel Flat Face Flanged Table 13
Joints
800-lb Cast Iron to 600-lb Steel Flanged Joints Table 14
Wafer-Type Butterfly Valve and 150-lb Steel Flanges Table 15
Wafer-Type Butterfly Valve and 150-lb Bronze Flanges Table 16
Bolting Lengths for Tapped Lug-Type Butterfly Valve Table 17
and 150-lb Steel Flanges to ASME B16.5
TABLE 1 Bolting Lengths for 150-lb Steel Flanged Joints to ASME B16.5 and MSS-SP-44 (see Fig. 1 and Fig. 2)
Bolt Bolt Length Stud Bolt
Nominal Quantity Flange Bolt Stud
Diameter, Carbon Steel, Length
A
Pipe Size, in. per Joint Thickness, in. Bolt Thread
A A A
in. in. Carbon Steel, in.
1 1 7 1 3 1
⁄2 ⁄2 4 ⁄16 ⁄2-13 UNC-2A 1 ⁄4 2 ⁄4
3 1 1 1 1
⁄4 ⁄2 4 ⁄2 ⁄2-13 UNC-2A 2 2 ⁄2
1 9 1 1
1 ⁄2 4 ⁄16 ⁄2-13 UNC-2A 2 2 ⁄2
1 1 5 1 1 3
1 ⁄4 ⁄2 4 ⁄8 ⁄2-13 UNC-2A 2 ⁄4 2 ⁄4
1 1 11 1 1 3
1 ⁄2 ⁄2 4 ⁄16 ⁄2-13 UNC-2A 2 ⁄4 2 ⁄4
5 3 5 3 1
2 ⁄8 4 ⁄4 ⁄8-11 UNC-2A 2 ⁄4 3 ⁄4
1 5 7 5 1
2 ⁄2 ⁄8 4 ⁄8 ⁄8-11 UNC-2A 3 3 ⁄2
5 15 5 1
3 ⁄8 4 ⁄16 ⁄8-11 UNC-2A 3 3 ⁄2
1 5 15 5 1
3 ⁄2 ⁄8 8 ⁄16 ⁄8-11 UNC-2A 3 3 ⁄2
5 15 5 1
4 ⁄8 8 ⁄16 ⁄8-11 UNC-2A 3 3 ⁄2
3 15 3 1 3
5 ⁄4 8 ⁄16 3 ⁄4-11 UNC-2A 3 ⁄4 3 ⁄4
3 3 1
6 ⁄4 81 ⁄4-10 UNC-2A 3 ⁄4 4
3 1 3 1 1
8 ⁄4 81 ⁄8 ⁄4-10 UNC-2A 3 ⁄2 4 ⁄4
7 3 7 3 1
10 ⁄8 12 1 ⁄16 ⁄8-9 UNC-2A 3 ⁄4 4 ⁄2
7 1 7 3
12 ⁄8 12 1 ⁄4 ⁄8-9 UNC-2A 4 4 ⁄4
3 1 1
14 1 12 1 ⁄8 1-8 UNC-2A 4 ⁄4 5 ⁄4
7 1 1
16 1 16 1 ⁄16 1-8 UNC-2A 4 ⁄2 5 ⁄4
1 9 1 3
18 1 ⁄8 16 1 ⁄16 1 ⁄8-7 UNC-2A 5 ⁄4
1 11 1 1 1
20 1 ⁄8 20 1 ⁄16 1 ⁄8-7 UNC-2A 5 ⁄4 6 ⁄4
1 7 1 3 3
24 1 ⁄4 20 1 ⁄8 1 ⁄4-7 UNC-2A 5 ⁄4 6 ⁄4
1 11 11 1 1
26 1 ⁄4 24 2 ⁄16 1 ⁄16-7 UNC-2A 7 ⁄4 8 ⁄2
1 13 1 1 3
28 1 ⁄4 28 2 ⁄16 1 ⁄4-7 UNC-2A 7 ⁄2 8 ⁄4
1 15 1 3
30 1 ⁄4 28 2 ⁄16 1 ⁄4-7 UNC-2A 7 ⁄4 9
1 3 1 3
32 1 ⁄2 28 3 ⁄16 1 ⁄2-6 UNC-2A 8 ⁄4 10
1 1 1 3
34 1 ⁄2 32 3 ⁄4 1 ⁄2-6 UNC-2A 8 ⁄4 10
1 9 1 1 3
36 1 ⁄2 32 3 ⁄16 1 ⁄2-6 UNC-2A 9 ⁄2 10 ⁄4
1 7 1 1 1
38 1 ⁄2 32 3 ⁄16 1 ⁄2-6 UNC-2A 9 ⁄4 10 ⁄2
1 9 1 1 3
40 1 ⁄2 36 3 ⁄16 1 ⁄2-6 UNC-2A 9 ⁄2 10 ⁄4
1 13 1 1
42 1 ⁄2 36 3 ⁄16 1 ⁄2-6 UNC-2A 10 11 ⁄4
1 1 1 1
44 1 ⁄2 40 4 1 ⁄2-6 UNC-2A 10 ⁄4 11 ⁄2
1 1 1 1 3
46 1 ⁄2 40 4 ⁄16 1 ⁄2-6 UNC-2A 10 ⁄2 11 ⁄4
1 1 1 3 1
48 1 ⁄2 44 4 ⁄4 1 ⁄2-6 UNC-2A 10 ⁄4 12 ⁄4
A
1 in. = 25.4 mm.
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F704 − 81 (2018)
TABLE 2 Bolting Lengths for 300-lb Steel Flanged Joints to ASME B16.5 (see Fig. 1 and Fig. 2)
Nominal Bolt Bolt Length Stud Bolt
Quantity Flange Bolt Stud
Pipe Size, Diameter, Carbon Steel, Length
A
per Joint Thickness, in. Bolt Thread
A A A
in. in. in. Carbon Steel, in.
1 1 9 1 1
⁄2 ⁄2 4 ⁄16 ⁄2-13 UNC-2A 2 2 ⁄2
3 5 5 5 1
⁄4 ⁄8 4 ⁄8 ⁄8-11 UNC-2A 2 ⁄4 3
5 11 5 1
1 ⁄8 4 ⁄16 ⁄8-11 UNC-2A 2 ⁄2 3
1 5 3 5 1 1
1 ⁄4 ⁄8 4 ⁄4 ⁄8-11 UNC-2A 2 ⁄2 3 ⁄4
1 3 13 3 1
1 ⁄2 ⁄4 4 ⁄16 ⁄4-10 UNC-2A 3 3 ⁄2
5 7 5 1
2 ⁄8 8 ⁄8 ⁄8-11 UNC-2A 3 3 ⁄2
1 3 3 1
2 ⁄2 ⁄4 81 ⁄4-10 UNC-2A 3 ⁄4 4
3 1 3 1 1
3 ⁄4 81 ⁄8 ⁄4-10 UNC-2A 3 ⁄2 4 ⁄4
1 3 3 3 3 1
3 ⁄2 ⁄4 81 ⁄16 ⁄4-10 UNC-2A 3 ⁄4 4 ⁄4
3 1 3 3 1
4 ⁄4 81 ⁄4 ⁄4-10 UNC-2A 3 ⁄4 4 ⁄2
3 3 3 3
5 ⁄4 81 ⁄8 ⁄4-10 UNC-2A 4 4 ⁄4
3 7 3 1 3
6 ⁄4 12 1 ⁄16 ⁄4-10 UNC-2A 4 ⁄4 4 ⁄4
7 5 7 3 1
8 ⁄8 12 1 ⁄8 ⁄8-8 UNC-2A 4 ⁄4 5 ⁄2
7 1 1
10 1 16 1 ⁄8 1-8 UNC-2A 5 ⁄4 6 ⁄4
1 1 3 3
12 1 ⁄8 16 2 1 ⁄8-7 UNC-2A 5 ⁄4 6 ⁄4
1 1 1
14 1 ⁄8 20 2 ⁄8 1 ⁄8-7 UNC-2A 6 7
1 1 1 1
16 1 ⁄4 20 2 ⁄4 1 ⁄4-7 UNC-2A 6 ⁄4 7
1 3 1 1 3
18 1 ⁄4 24 2 ⁄8 1 ⁄4-7 UNC-2A 6 ⁄2 7 ⁄4
1 1 1
20 1 ⁄4 24 2 ⁄2 1 ⁄4-7 UNC-2A 7 8
1 3 1 3
24 1 ⁄2 24 2 ⁄4 1 ⁄2-6 UNC-2A 7 ⁄4 9
A
1 in. = 25.4 mm.
TABLE 3 Bolting Lengths for 400-lb Steel Flanged Joints to ASME B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Quantity Bolt Stud Bolt Length Alloy
Pipe Size, Diameter, Thickness, Length Alloy
A
per Joint Bolt Thread Steel, in.
A A A
in. in. in. Steel, in.
B B BBB B
⁄2
B B BBB B
⁄4
B B BBB B
B B BBB B
1 ⁄4
B B BBB B
1 ⁄2
B B BBB B
B B BBB B
2 ⁄2
B B BBB B
1 B B BBB B
3 ⁄2
7 3 7 1
4 ⁄8 81 ⁄8 ⁄8-9 UNC-2A not used 5 ⁄2
7 1 7 3
5 ⁄8 81 ⁄2 ⁄8-9 UNC-2A not used 5 ⁄4
7 5 7
6 ⁄8 12 1 ⁄8 ⁄8-9 UNC-2A not used 6
7 3
81 12 1 ⁄8 1-8 UNC-2A not used 6 ⁄4
1 1 1 1
10 1 ⁄8 16 2 ⁄8 1 ⁄8-8 UN-2A not used 7 ⁄2
1 1 1
12 1 ⁄4 16 2 ⁄4 1 ⁄4-8 UN-2A not used 8
1 3 1 1
14 1 ⁄4 20 2 ⁄8 1 ⁄4-8 UN-2A not used 8 ⁄4
3 1 3 3
16 1 ⁄8 20 2 ⁄2 1 ⁄8-8 UN-2A not used 8 ⁄4
3 5 3
18 1 ⁄8 24 2 ⁄8 1 ⁄8-8 UN-2A not used 9
1 3 1 1
20 1 ⁄2 24 2 ⁄4 1 ⁄2-8 UN-2A not used 9 ⁄2
3 3 1
24 1 ⁄4 24 3 1 ⁄4-8 UN-2A not used 10 ⁄2
A
1 in. = 25.4 mm.
B
For dimensions of these pipe sizes, refer to Table 4.
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F704 − 81 (2018)
TABLE 4 Bolting Lengths for 600-lb Steel Flanged Joints to ASME B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Quantity Bolt Stud Bolt Length Alloy
Pipe Size, Diameter, Thickness, Length Alloy
A
per Joint Bolt Thread Steel, in.
A A A
in. in. in. Steel, in.
1 1 9 1
⁄2 ⁄2 4 ⁄16 ⁄2-13 UNC-2A not used 3
3 5 5 5 1
⁄4 ⁄8 4 ⁄8 ⁄8-11 UNC-2A not used 3 ⁄2
5 11 5 1
1 ⁄8 4 ⁄16 ⁄8-11 UNC-2A not used 3 ⁄2
1 5 13 5 3
1 ⁄4 ⁄8 4 ⁄16 ⁄8-11 UNC-2A not used 3 ⁄4
1 3 7 3 1
1 ⁄2 ⁄4 4 ⁄8 ⁄4-10 UNC-2A not used 4 ⁄4
5 5 1
2 ⁄8 81 ⁄8-11 UNC-2A not used 4 ⁄4
1 3 1 3 3
2 ⁄2 ⁄4 81 ⁄8 ⁄4-10 UNC-2A not used 4 ⁄4
3 1 3
3 ⁄4 81 ⁄4 ⁄4-10 UNC-2A not used 5
1 7 3 7 1
3 ⁄2 ⁄8 81 ⁄8 ⁄8-9 UNC-2A not used 5 ⁄2
7 1 7 3
4 ⁄8 81 ⁄2 ⁄8-9 UNC-2A not used 5 ⁄4
3 1
51 8 1 ⁄4 1-8 UNC-2A not used 6 ⁄2
7 3
61 12 1 ⁄8 1-8 UNC-2A not used 6 ⁄4
1 3 1 1
81 ⁄8 12 2 ⁄16 1 ⁄8-8 UN-2A not used 7 ⁄2
1 1 1 1
10 1 ⁄4 16 2 ⁄2 1 ⁄4-8 UN-2A not used 8 ⁄2
1 5 1 3
12 1 ⁄4 20 2 ⁄8 1 ⁄4-8 UN-2A not used 8 ⁄4
3 3 3 1
14 1 ⁄8 20 2 ⁄4 1 ⁄8-8 UN-2A not used 9 ⁄4
1 1
16 1 ⁄2 20 3 1 ⁄2-8 UN-2A not used 10
5 1 5 3
18 1 ⁄8 20 3 ⁄4 1 ⁄8-8 UN-2A not used 10 ⁄4
5 1 5 1
20 1 ⁄8 24 3 ⁄2 1 ⁄8-8 UN-2A not used 11 ⁄4
7 7
24 1 ⁄8 24 4 1 ⁄8-8 UN-2A not used 13
A
1 in. = 25.4 mm.
TABLE 5 Bolting Lengths for 900-lb Steel Flanged Joints to ASME B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Quantity Bolt Stud Bolt Length Alloy
Pipe Size, Diameter, Thickness, Length Alloy
A
per Joint Bolt Thread Steel, in.
A A A
in. in. in. Steel, in.
B B BBB B
⁄2
B B BBB B
⁄4
B B BBB B
B B BBB B
1 ⁄4
B B BBB B
1 ⁄2
B B BBB B
B B BBB B
2 ⁄2
7 1 7 3
3 ⁄8 81 ⁄2 ⁄8-9 UNC-2A not used 5 ⁄4
1 3 1 3
41 ⁄8 81 ⁄4 1 ⁄8-8 UN-2A not used 6 ⁄4
1 1 1
51 ⁄4 82 1 ⁄4-8 UN-2A not used 7 ⁄2
1 3 1 1
61 ⁄8 12 2 ⁄16 1 ⁄8-8 UN-2A not used 7 ⁄2
3 1 3 3
81 ⁄8 12 2 ⁄2 1 ⁄8-8 UN-2A not used 8 ⁄4
3 3 3 1
10 1 ⁄8 16 2 ⁄4 1 ⁄8-8 UN-2A not used 9 ⁄4
3 1 3
12 1 ⁄8 20 3 ⁄8 1 ⁄8-8 UN-2A not used 10
1 3 1 3
14 1 ⁄2 20 3 ⁄8 1 ⁄2-8 UN-2A not used 10 ⁄4
5 1 5 1
16 1 ⁄8 20 3 ⁄2 1 ⁄8-8 UN-2A not used 11 ⁄4
7 7 3
18 1 ⁄8 20 4 1 ⁄8-8 UN-2A not used 12 ⁄4
1 3
20 2 20 4 ⁄4 2-8 UN-2A not used 13 ⁄4
1 1 1 1
24 2 ⁄2 20 5 ⁄2 2 ⁄2-8 UN-2A not used 17 ⁄4
A
1 in. = 25.4 mm.
B
For dimensions of these pipe sizes, refer to Table 6.
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F704 − 81 (2018)
TABLE 6 Bolting Lengths for 1500-lb Steel Flanged Joints to ASME B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Quantity Bolt Stud Bolt Length Alloy
Pipe Size, Diameter, Thickness, Length Alloy
A
per Joint Bolt Thread Steel, in.
A A A
in. in. in. Steel, in.
1 3 7 3 1
⁄2 ⁄4 4 ⁄8 ⁄4-10 UNC-2A not used 4 ⁄4
3 3 3 1
⁄4 ⁄4 41 ⁄4-10 UNC-2A not used 4 ⁄2
7 1 7
1 ⁄8 41 ⁄8 ⁄8-9 UNC-2A not used 5
1 7 1 7
1 ⁄4 ⁄8 41 ⁄8 ⁄8-9 UNC-2A not used 5
1 1 1
1 ⁄2 14 1 ⁄4 1-8 UNC-2A not used 5 ⁄2
7 1 7 3
2 ⁄8 81 ⁄2 ⁄8-9 UNC-2A not used 5 ⁄4
1 5 1
2 ⁄2 18 1 ⁄8 1-8 UNC-2A not used 6 ⁄4
1 7 1
31 ⁄8 81 ⁄8 1 ⁄8-8 UN-2A not used 7
1 1 1 3
41 ⁄4 82 ⁄8 1 ⁄4-8 UN-2A not used 7 ⁄4
1 7 1 3
51 ⁄2 82 ⁄8 1 ⁄2-8 UN-2A not used 9 ⁄4
3 1 3 1
61 ⁄8 12 3 ⁄4 1 ⁄8-8 UN-2A not used 10 ⁄4
5 5 5 1
81 ⁄8 12 3 ⁄8 1 ⁄8-8 UN-2A not used 11 ⁄2
7 1 7 1
10 1 ⁄8 12 4 ⁄4 1 ⁄8-8 UN-2A not used 13 ⁄4
7 3
12 2 16 4 ⁄8 2-8 UN-2A not used 14 ⁄4
1 1 1
14 2 ⁄4 16 5 ⁄4 2 ⁄4-8 UN-2A not used 16
1 3 1 1
16 2 ⁄2 16 5 ⁄4 2 ⁄2-8 UN-2A not used 17 ⁄2
3 3 3 1
18 2 ⁄4 16 6 ⁄8 2 ⁄4-8 UN-2A not used 19 ⁄2
20 3 16 7 3-8 UN-2A not used 21 ⁄4
1 1 1
24 3 ⁄2 16 8 3 ⁄2-8 UN-2A not used 24 ⁄4
A
1 in. = 25.4 mm.
TABLE 7 Bolting Lengths for 2500-lb Steel Flanged Joints to ASME B16.5 (see Fig. 3 and Fig. 4)
Bolt Flange Stud Bolt
Nominal Quantity Bolt Stud Bolt Length Alloy
Diameter, Thickness, Length Alloy
A
Pipe Size, in. per Joint Bolt Thread Steel, in.
A A A
in. in. Steel, in.
1 3 3 3 3
⁄2 ⁄4 41 ⁄16 ⁄4-10 UNC-2A not used 4 ⁄4
3 3 1 3
⁄4 ⁄4 41 ⁄4 ⁄4-10 UNC-2A not used 5
7 3 7 1
1 ⁄8 41 ⁄8 ⁄8-9 UNC-2A not used 5 ⁄2
1 1
1 ⁄4 14 1 ⁄2 1-8 UNC-2A not used 6
1 1 3 1 3
1 ⁄2 1 ⁄8 41 ⁄4 1 ⁄8-8 UN-2A not used 6 ⁄4
2 1 8 2 1-8 UNC-2A not used 7
1 1 1 1 3
2 ⁄2 1 ⁄8 82 ⁄4 1 ⁄8-8 UN-2A not used 7 ⁄4
1 5 1 3
31 ⁄4 82 ⁄8 1 ⁄4-8 UN-2A not used 8 ⁄4
1 1
41 ⁄2 83 1 ⁄2-8 UN-2A not used 10
3 5 3 3
51 ⁄4 83 ⁄8 1 ⁄4-8 UN-2A not used 11 ⁄4
1 1
62 8 4 ⁄4 2-8 UN-2A not used 13 ⁄2
8 2 12 5 2-8 UN-2A not used 15
1 1 1 1
10 2 ⁄2 12 6 ⁄2 2 ⁄2-8 UN-2A not used 19 ⁄4
3 1 3 1
12 2 ⁄4 12 7 ⁄4 2 ⁄4-8 UN-2A not used 21 ⁄4
A
1 in. = 25.4 mm.
TABLE 8 Bolting Lengths for 150-lb Bronze Flanged Joints to ASME B16.24 (see Fig. 1 and Fig. 2)
Bolt Flange Bolt Length Stud Bolt
Nominal Quantity Bolt Stud
Diameter, Thickness, Carbon Steel, Length
Pipe Size, in. per Joint Bolt Thread
A A A A
in. in. in. Carbon Steel, in.
1 1 5 1 1
⁄2 ⁄2 4 ⁄16 ⁄2-13 UNC-2A 1 ⁄2 2
3 1 11 1 3 1
⁄4 ⁄2 4 ⁄32 ⁄2-13 UNC-2A 1 ⁄4 2 ⁄4
1 3 1 3 1
1 ⁄2 4 ⁄8 ⁄2-13 UNC-2A 1 ⁄4 2 ⁄4
1 1 13 1 3 1
1 ⁄4 ⁄2 4 ⁄32 ⁄2-13 UNC-2A 1 ⁄4 2 ⁄4
1 1 7 1 3 1
1 ⁄2 ⁄2 4 ⁄16 ⁄2-13 UNC
...

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.
´1
Designation: F704 − 81 (Reapproved 2014) F704 − 81 (Reapproved 2018)An American National Standard
Standard Practice for
Selecting Bolting Lengths for Piping System Flanged
Joints
This standard is issued under the fixed designation F704; 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 U.S. Department of Defense.
ε NOTE—Editorial corrections were made to Section 2 in September 2018.
1. Scope
1.1 This practice covers bolt and stud bolt lengths, quantities, and thread series for pipe to pipe and pipe to valve flanged joints
(Note 1) in the nominal pipe size ranges of ⁄2- through through 48-in. (12.7-(12.7 through 1219-mm) diameter and pressure range
of 125 through 2500 psi (0.8 through 17 236 kPa).
NOTE 1—This is applicable when flange of valve has the same thickness as mating flange.
1.2 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.
1.3 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 appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 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 ANSIASME Standards:
B1.1 Unified Inch Screw Threads (UN and UNR Thread Form)
B16.1 CastGray Iron Pipe Flanges and Flanged Fittings (25, 125, 250, and 800 lb)Fittings: Classes 25, 125, and 250
B16.5 Steel Pipe Flanges and Flanged Fittings (150, 300, 400, 600, 900, 1500, and 2500 lb Including Reference to
Valves)Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
B16.24 Bronze Flanges and Flanged Fittings (150 and 300 lb)Cast Copper Alloy Pipe Flanges, Flanged Fittings, and Valves:
Classes 150, 300, 600, 900, 1500, and 2500
B18.2.1 Square and Hex Bolts and ScrewsSquare, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange,
Lobed Head, and Lag Screws (Inch Series)
B18.2.2 Square and Hex NutsNuts for General Applications: Machine Screw Nuts, Hex, Square, Hex Flange, and Coupling Nuts
(Inch Series)
2.2 MSS Standards:
MSS SP-44MSS-SP-44 Steel Pipe Flanges
3. Bolting Criteria
3.1 Bolt and stud bolt lengths are computed using the following (see Annex A1):
3.1.1 Includes maximum nut thickness in accordance with ANSIASME B18.2.2.
This practice is under the jurisdiction of ASTM Committee F25 on Ships and Marine Technology and is the direct responsibility of Subcommittee F25.11 on Machinery
and Piping Systems.
Current edition approved Nov. 1, 2014Sept. 1, 2018. Published November 2014October 2018. Originally approved in 1981. Last previous edition approved in 20092014
as F704 – 81 (2009).(2014). DOI: 10.1520/F0704-81R14.10.1520/F0704-81R18E01.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, Society of Mechanical Engineers (ASME), ASME International Headquarters,
Two Park Ave., New York, NY 10036, http://www.ansi.org.10016-5990, http://www.asme.org.
Available from Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-
hq.com.http://www.mss-hq.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F704 − 81 (2018)
3.1.2 Does not include washer thickness.
3.1.3 Does not include bolt or stud bolt point height.
3.1.4 Includes allowance for up to ⁄8-in. (3.2-mm) thick gaskets, except butterfly valves.
3.1.5 Includes ⁄4-in. (6.3-mm) raised face in addition to flange thickness listed in tables for flanges rated at 400 psi (2.8 kPa)
and above.
3.1.6 Includes use of heavy hex nut and bolt design.
3.1.7 Includes plus tolerance for flange thickness in accordance with ANSIASME B16.5.
3.2 All bolts and stud bolts have threads in accordance with ANSIASME B1.1, Class 2A dimensioning and nuts Class 2B.
3.3 The material requirements for bolts, stud bolts, and nuts are obtained from the material specifications of individual system
diagrams.
3.4 Alloy steel bolting 1-in. (25.4-mm) nominal diameter and smaller and all carbon steel bolting has threads of the UNC Series;
alloy steel bolting above 1-in. nominal diameter has threads of the 8-UN Series.
3.5 For detailed descriptions of flange bolting assemblies, butterfly valve bolting assemblies, and tapped lug-type butterfly valve
bolting assemblies, refer to Figs. 1–7.
4. List of Tables
4.1 The tables are arranged in the following sequence:
150-lb Steel Flanged Joints Table 1
300-lb Steel Flanged Joints Table 2
400-lb Steel Flanged Joints Table 3
600-lb Steel Flanged Joints Table 4
900-lb Steel Flanged Joints Table 5
1500-lb Steel Flanged Joints Table 6
2500-lb Steel Flanged Joints Table 7
150-lb Bronze Flanged Joints Table 8
300-lb Bronze Flanged Joints Table 9
150-lb Steel Flat Face to 150-lb Table 10
Bronze Flanged Joints
150-lb Steel Flat Face to 150-lb Table 10
Bronze Flanged Joints
300-lb Steel Flat Face to 300-lb Table 11
Bronze Flanged Joints
300-lb Steel Flat Face to 300-lb Table 11
Bronze Flanged Joints
125-lb Cast Iron to 150-lb Steel Flat Table 12
Face Flanged Joints
125-lb Cast Iron to 150-lb Steel Flat Table 12
Face Flanged Joints
250-lb Cast Iron to 300-lb Steel Flat Table 13
Face Flanged Joints
250-lb Cast Iron to 300-lb Steel Flat Table 13
Face Flanged Joints
800-lb Cast Iron to 600-lb Steel Table 14
Flanged Joints
800-lb Cast Iron to 600-lb Steel Table 14
Flanged Joints
Wafer-Type Butterfly Valve and Table 15
150-lb Steel Flanges
Wafer-Type Butterfly Valve and Table 15
150-lb Steel Flanges
Wafer-Type Butterfly Valve and Table 16
150-lb Bronze Flanges
Wafer-Type Butterfly Valve and Table 16
150-lb Bronze Flanges
Bolting Lengths for Tapped Lug- Table 17
Type Butterfly Valve and 150-lb
Steel Flanges to ANSI B16.5
Bolting Lengths for Tapped Lug-Type Table 17
Butterfly Valve and 150-lb
Steel Flanges to ASME B16.5
Bolting Lengths for Tapped Lug- Table 18
Type Butterfly Valve and 150 lb
Bronze Flanges to ANSI B16.24
Bolting Lengths for Tapped Lug-Type Table 18
Butterfly Valve and 150 lb
Bronze Flanges to ASME B16.24
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F704 − 81 (2018)
TABLE 1 Bolting Lengths for 150-lb Steel Flanged Joints to ANSIASME B16.5 and MSS SP-44 MSS-SP-44 (see Fig. 1 and Fig. 2)
Stud Bolt
Bolt Bolt Length
Nominal Quantity Flange Bolt Stud Length Car-
Diameter, Carbon Steel,
A
Pipe Size, in. per Joint Thickness, in. Bolt Thread bonCarbon Steel,
A A
in. in.
A
in.
1 1 7 1 3 1
⁄2 ⁄2 4 ⁄16 ⁄2-13 UNC-2A 1 ⁄4 2 ⁄4
3 1 1 1 1
⁄4 ⁄2 4 ⁄2 ⁄2-13 UNC-2A 2 2 ⁄2
1 9 1 1
1 ⁄2 4 ⁄16 ⁄2-13 UNC-2A 2 2 ⁄2
1 1 5 1 1 3
1 ⁄4 ⁄2 4 ⁄8 ⁄2-13 UNC-2A 2 ⁄4 2 ⁄4
1 1 11 1 1 3
1 ⁄2 ⁄2 4 ⁄16 ⁄2-13 UNC-2A 2 ⁄4 2 ⁄4
5 3 5 3 1
2 ⁄8 4 ⁄4 ⁄8-11 UNC-2A 2 ⁄4 3 ⁄4
1 5 7 5 1
2 ⁄2 ⁄8 4 ⁄8 ⁄8-11 UNC-2A 3 3 ⁄2
5 15 5 1
3 ⁄8 4 ⁄16 ⁄8-11 UNC-2A 3 3 ⁄2
1 5 15 5 1
3 ⁄2 ⁄8 8 ⁄16 ⁄8-11 UNC-2A 3 3 ⁄2
5 15 5 1
4 ⁄8 8 ⁄16 ⁄8-11 UNC-2A 3 3 ⁄2
3 15 3 1 3
5 ⁄4 8 ⁄16 3 ⁄4-11 UNC-2A 3 ⁄4 3 ⁄4
3 3 1
6 ⁄4 8 1 ⁄4-10 UNC-2A 3 ⁄4 4
3 1 3 1 1
8 ⁄4 8 1 ⁄8 ⁄4-10 UNC-2A 3 ⁄2 4 ⁄4
7 3 7 3 1
10 ⁄8 12 1 ⁄16 ⁄8-9 UNC-2A 3 ⁄4 4 ⁄2
7 1 7 3
12 ⁄8 12 1 ⁄4 ⁄8-9 UNC-2A 4 4 ⁄4
3 1 1
14 1 12 1 ⁄8 1-8 UNC-2A 4 ⁄4 5 ⁄4
7 1 1
16 1 16 1 ⁄16 1-8 UNC-2A 4 ⁄2 5 ⁄4
1 9 1 3
18 1 ⁄8 16 1 ⁄16 1 ⁄8-7 UNC-2A 5 ⁄4
1 11 1 1 1
20 1 ⁄8 20 1 ⁄16 1 ⁄8-7 UNC-2A 5 ⁄4 6 ⁄4
1 7 1 3 3
24 1 ⁄4 20 1 ⁄8 1 ⁄4-7 UNC-2A 5 ⁄4 6 ⁄4
1 11 11 1 1
26 1 ⁄4 24 2 ⁄16 1 ⁄16-7 UNC-2A 7 ⁄4 8 ⁄2
1 13 1 1 3
28 1 ⁄4 28 2 ⁄16 1 ⁄4-7 UNC-2A 7 ⁄2 8 ⁄4
1 15 1 3
30 1 ⁄4 28 2 ⁄16 1 ⁄4-7 UNC-2A 7 ⁄4 9
1 3 1 3
32 1 ⁄2 28 3 ⁄16 1 ⁄2-6 UNC-2A 8 ⁄4 10
1 1 1 3
34 1 ⁄2 32 3 ⁄4 1 ⁄2-6 UNC-2A 8 ⁄4 10
1 9 1 1 3
36 1 ⁄2 32 3 ⁄16 1 ⁄2-6 UNC-2A 9 ⁄2 10 ⁄4
1 7 1 1 1
38 1 ⁄2 32 3 ⁄16 1 ⁄2-6 UNC-2A 9 ⁄4 10 ⁄2
1 9 1 1 3
40 1 ⁄2 36 3 ⁄16 1 ⁄2-6 UNC-2A 9 ⁄2 10 ⁄4
1 13 1 1
42 1 ⁄2 36 3 ⁄16 1 ⁄2-6 UNC-2A 10 11 ⁄4
1 1 1 1
44 1 ⁄2 40 4 1 ⁄2-6 UNC-2A 10 ⁄4 11 ⁄2
1 1 1 1 3
46 1 ⁄2 40 4 ⁄16 1 ⁄2-6 UNC-2A 10 ⁄2 11 ⁄4
1 1 1 3 1
48 1 ⁄2 44 4 ⁄4 1 ⁄2-6 UNC-2A 10 ⁄4 12 ⁄4
A
1 in. = 25.4 mm.
TABLE 2 Bolting Lengths for 300-lb Steel Flanged Joints to ANSIASME B16.5 (see Fig. 1 and Fig. 2)
Nominal Bolt Bolt Length Stud Bolt
Quantity Flange Bolt Stud
Pipe Size, Diameter, Carbon Steel, Length Car-
A
per Joint Thickness, in. Bolt Thread
A A A
in. in. in. bonCarbon Steel, in.
1 1 9 1 1
⁄2 ⁄2 4 ⁄16 ⁄2-13 UNC-2A 2 2 ⁄2
3 5 5 5 1
⁄4 ⁄8 4 ⁄8 ⁄8-11 UNC-2A 2 ⁄4 3
5 11 5 1
1 ⁄8 4 ⁄16 ⁄8-11 UNC-2A 2 ⁄2 3
1 5 3 5 1 1
1 ⁄4 ⁄8 4 ⁄4 ⁄8-11 UNC-2A 2 ⁄2 3 ⁄4
1 3 13 3 1
1 ⁄2 ⁄4 4 ⁄16 ⁄4-10 UNC-2A 3 3 ⁄2
5 7 5 1
2 ⁄8 8 ⁄8 ⁄8-11 UNC-2A 3 3 ⁄2
1 3 3 1
2 ⁄2 ⁄4 8 1 ⁄4-10 UNC-2A 3 ⁄4 4
3 1 3 1 1
3 ⁄4 8 1 ⁄8 ⁄4-10 UNC-2A 3 ⁄2 4 ⁄4
1 3 3 3 3 1
3 ⁄2 ⁄4 8 1 ⁄16 ⁄4-10 UNC-2A 3 ⁄4 4 ⁄4
3 1 3 3 1
4 ⁄4 8 1 ⁄4 ⁄4-10 UNC-2A 3 ⁄4 4 ⁄2
3 3 3 3
5 ⁄4 8 1 ⁄8 ⁄4-10 UNC-2A 4 4 ⁄4
3 7 3 1 3
6 ⁄4 12 1 ⁄16 ⁄4-10 UNC-2A 4 ⁄4 4 ⁄4
7 5 7 3 1
8 ⁄8 12 1 ⁄8 ⁄8-8 UNC-2A 4 ⁄4 5 ⁄2
7 1 1
10 1 16 1 ⁄8 1-8 UNC-2A 5 ⁄4 6 ⁄4
1 1 3 3
12 1 ⁄8 16 2 1 ⁄8-7 UNC-2A 5 ⁄4 6 ⁄4
1 1 1
14 1 ⁄8 20 2 ⁄8 1 ⁄8-7 UNC-2A 6 7
1 1 1 1
16 1 ⁄4 20 2 ⁄4 1 ⁄4-7 UNC-2A 6 ⁄4 7
1 3 1 1 3
18 1 ⁄4 24 2 ⁄8 1 ⁄4-7 UNC-2A 6 ⁄2 7 ⁄4
1 1 1
20 1 ⁄4 24 2 ⁄2 1 ⁄4-7 UNC-2A 7 8
1 3 1 3
24 1 ⁄2 24 2 ⁄4 1 ⁄2-6 UNC-2A 7 ⁄4 9
A
1 in. = 25.4 mm.
5. Keywords
5.1 bolting lengths; cover bolt; flange joint(s); marine technology; ships; stud bolts
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F704 − 81 (2018)
TABLE 3 Bolting Lengths for 400-lb Steel Flanged Joints to ANSIASME B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Quantity Bolt Stud Bolt Length Alloy
Pipe Size, Diameter, Thickness, Length Alloy
A
per Joint Bolt Thread Steel, in.
A A A
in. in. in. Steel, in.
B B B B B B
⁄2
B B B B B B
⁄4
B B B B B B
B B B B B B
1 ⁄4
B B B B B B
1 ⁄2
B B B B B B
B B B B B B
2 ⁄2
B B B B B B
B B B B B B
3 ⁄2
7 3 7 1
4 ⁄8 8 1 ⁄8 ⁄8-9 UNC-2A not used 5 ⁄2
7 1 7 3
5 ⁄8 8 1 ⁄2 ⁄8-9 UNC-2A not used 5 ⁄4
7 5 7
6 ⁄8 12 1 ⁄8 ⁄8-9 UNC-2A not used 6
7 3
8 1 12 1 ⁄8 1-8 UNC-2A not used 6 ⁄4
1 1 1 1
10 1 ⁄8 16 2 ⁄8 1 ⁄8-8 UN-2A not used 7 ⁄2
1 1 1
12 1 ⁄4 16 2 ⁄4 1 ⁄4-8 UN-2A not used 8
1 3 1 1
14 1 ⁄4 20 2 ⁄8 1 ⁄4-8 UN-2A not used 8 ⁄4
3 1 3 3
16 1 ⁄8 20 2 ⁄2 1 ⁄8-8 UN-2A not used 8 ⁄4
3 5 3
18 1 ⁄8 24 2 ⁄8 1 ⁄8-8 UN-2A not used 9
1 3 1 1
20 1 ⁄2 24 2 ⁄4 1 ⁄2-8 UN-2A not used 9 ⁄2
3 3 1
24 1 ⁄4 24 3 1 ⁄4-8 UN-2A not used 10 ⁄2
A
1 in. = 25.4 mm.
B
For dimensions of these pipe sizes, refer to Table 4.
TABLE 4 Bolting Lengths for 600-lb Steel Flanged Joints to ANSIASME B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Quantity Bolt Stud Bolt Length Alloy
Pipe Size, Diameter, Thickness, Length Alloy
A
per Joint Bolt Thread Steel, in.
A A A
in. in. in. Steel, in.
1 1 9 1
⁄2 ⁄2 4 ⁄16 ⁄2-13 UNC-2A not used 3
3 5 5 5 1
⁄4 ⁄8 4 ⁄8 ⁄8-11 UNC-2A not used 3 ⁄2
5 11 5 1
1 ⁄8 4 ⁄16 ⁄8-11 UNC-2A not used 3 ⁄2
1 5 13 5 3
1 ⁄4 ⁄8 4 ⁄16 ⁄8-11 UNC-2A not used 3 ⁄4
1 3 7 3 1
1 ⁄2 ⁄4 4 ⁄8 ⁄4-10 UNC-2A not used 4 ⁄4
5 5 1
2 ⁄8 8 1 ⁄8-11 UNC-2A not used 4 ⁄4
1 3 1 3 3
2 ⁄2 ⁄4 8 1 ⁄8 ⁄4-10 UNC-2A not used 4 ⁄4
3 1 3
3 ⁄4 8 1 ⁄4 ⁄4-10 UNC-2A not used 5
1 7 3 7 1
3 ⁄2 ⁄8 8 1 ⁄8 ⁄8-9 UNC-2A not used 5 ⁄2
7 1 7 3
4 ⁄8 8 1 ⁄2 ⁄8-9 UNC-2A not used 5 ⁄4
3 1
5 1 8 1 ⁄4 1-8 UNC-2A not used 6 ⁄2
7 3
6 1 12 1 ⁄8 1-8 UNC-2A not used 6 ⁄4
1 3 1 1
8 1 ⁄8 12 2 ⁄16 1 ⁄8-8 UN-2A not used 7 ⁄2
1 1 1 1
10 1 ⁄4 16 2 ⁄2 1 ⁄4-8 UN-2A not used 8 ⁄2
1 5 1 3
12 1 ⁄4 20 2 ⁄8 1 ⁄4-8 UN-2A not used 8 ⁄4
3 3 3 1
14 1 ⁄8 20 2 ⁄4 1 ⁄8-8 UN-2A not used 9 ⁄4
1 1
16 1 ⁄2 20 3 1 ⁄2-8 UN-2A not used 10
5 1 5 3
18 1 ⁄8 20 3 ⁄4 1 ⁄8-8 UN-2A not used 10 ⁄4
5 1 5 1
20 1 ⁄8 24 3 ⁄2 1 ⁄8-8 UN-2A not used 11 ⁄4
7 7
24 1 ⁄8 24 4 1 ⁄8-8 UN-2A not used 13
A
1 in. = 25.4 mm.
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F704 − 81 (2018)
TABLE 5 Bolting Lengths for 900-lb Steel Flanged Joints to ANSIASME B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Quantity Bolt Stud Bolt Length Alloy
Pipe Size, Diameter, Thickness, Length Alloy
A
per Joint Bolt Thread Steel, in.
A A A
in. in. in. Steel, in.
B B B B B B
⁄2
B B B B B B
⁄4
B B B B B B
B B B B B B
1 ⁄4
B B B B B B
1 ⁄2
B B B B B B
B B B B B B
2 ⁄2
7 1 7 3
3 ⁄8 8 1 ⁄2 ⁄8-9 UNC-2A not used 5 ⁄4
1 3 1 3
4 1 ⁄8 8 1 ⁄4 1 ⁄8-8 UN-2A not used 6 ⁄4
1 1 1
5 1 ⁄4 8 2 1 ⁄4-8 UN-2A not used 7 ⁄2
1 3 1 1
6 1 ⁄8 12 2 ⁄16 1 ⁄8-8 UN-2A not used 7 ⁄2
3 1 3 3
8 1 ⁄8 12 2 ⁄2 1 ⁄8-8 UN-2A not used 8 ⁄4
3 3 3 1
10 1 ⁄8 16 2 ⁄4 1 ⁄8-8 UN-2A not used 9 ⁄4
3 1 3
12 1 ⁄8 20 3 ⁄8 1 ⁄8-8 UN-2A not used 10
1 3 1 3
14 1 ⁄2 20 3 ⁄8 1 ⁄2-8 UN-2A not used 10 ⁄4
5 1 5 1
16 1 ⁄8 20 3 ⁄2 1 ⁄8-8 UN-2A not used 11 ⁄4
7 7 3
18 1 ⁄8 20 4 1 ⁄8-8 UN-2A not used 12 ⁄4
1 3
20 2 20 4 ⁄4 2-8 UN-2A not used 13 ⁄4
1 1 1 1
24 2 ⁄2 20 5 ⁄2 2 ⁄2-8 UN-2A not used 17 ⁄4
A
1 in. = 25.4 mm.
B
For dimensions of these pipe sizes, refer to Table 6.
TABLE 6 Bolting Lengths for 1500-lb Steel Flanged Joints to ANSIASME B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Quantity Bolt Stud Bolt Length Alloy
Pipe Size, Diameter, Thickness, Length Alloy
A
per Joint Bolt Thread Steel, in.
A A A
in. in. in. Steel, in.
1 3 7 3 1
⁄2 ⁄4 4 ⁄8 ⁄4-10 UNC-2A not used 4 ⁄4
3 3 3 1
⁄4 ⁄4 4 1 ⁄4-10 UNC-2A not used 4 ⁄2
7 1 7
1 ⁄8 4 1 ⁄8 ⁄8-9 UNC-2A not used 5
1 7 1 7
1 ⁄4 ⁄8 4 1 ⁄8 ⁄8-9 UNC-2A not used 5
1 1 1
1 ⁄2 1 4 1 ⁄4 1-8 UNC-2A not used 5 ⁄2
7 1 7 3
2 ⁄8 8 1 ⁄2 ⁄8-9 UNC-2A not used 5 ⁄4
1 5 1
2 ⁄2 1 8 1 ⁄8 1-8 UNC-2A not used 6 ⁄4
1 7 1
3 1 ⁄8 8 1 ⁄8 1 ⁄8-8 UN-2A not used 7
1 1 1 3
4 1 ⁄4 8 2 ⁄8 1 ⁄4-8 UN-2A not used 7 ⁄4
1 7 1 3
5 1 ⁄2 8 2 ⁄8 1 ⁄2-8 UN-2A not used 9 ⁄4
3 1 3 1
6 1 ⁄8 12 3 ⁄4 1 ⁄8-8 UN-2A not used 10 ⁄4
5 5 5 1
8 1 ⁄8 12 3 ⁄8 1 ⁄8-8 UN-2A not used 11 ⁄2
7 1 7 1
10 1 ⁄8 12 4 ⁄4 1 ⁄8-8 UN-2A not used 13 ⁄4
7 3
12 2 16 4 ⁄8 2-8 UN-2A not used 14 ⁄4
1 1 1
14 2 ⁄4 16 5 ⁄4 2 ⁄4-8 UN-2A not used 16
1 3 1 1
16 2 ⁄2 16 5 ⁄4 2 ⁄2-8 UN-2A not used 17 ⁄2
3 3 3 1
...