ASTM F704-81(2022)
(Practice)Standard Practice for Selecting Bolting Lengths for Piping System Flanged Joints
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 in. through 48 in. (12.7 mm through 1219 mm) diameter and pressure range of 125 psi through 2500 psi (0.8 kPa 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
- Published
- Publication Date
- 30-Sep-2022
- Technical Committee
- F25 - Ships and Marine Technology
- Drafting Committee
- F25.11 - Machinery and Piping Systems
Overview
ASTM F704-81(2022), Standard Practice for Selecting Bolting Lengths for Piping System Flanged Joints, provides comprehensive guidelines for determining bolt and stud bolt lengths, quantities, and thread series for a wide range of piping system flanged joints. Developed by ASTM, this practice supports consistent and efficient assembly of flange joints between pipe-to-pipe and pipe-to-valve connections. The standard is applicable to flanged joints within nominal pipe sizes from 1/2 inch to 48 inches (12.7 mm to 1219 mm) and pressure ratings from 125 psi to 2500 psi (0.8 kPa to 17,236 kPa), covering most industrial and marine piping applications.
ASTM F704-81(2022) serves as a foundational document for those involved in the manufacture, installation, and maintenance of flanged piping systems in sectors such as marine technology, oil and gas, and power generation, where proper bolting is critical for safety and reliability.
Key Topics
- Bolt and Stud Bolt Lengths: Provides detailed tables for the correct lengths required for different types of flanged joints, considering flange thickness, nut height, gasket allowance, and raised face dimensions.
- Quantities Required: Specifies the number of bolts or stud bolts per joint for various flange sizes and classes.
- Thread Series: Outlines the appropriate thread series (such as UNC and UN) based on bolt material and diameter to ensure compatibility and mechanical integrity.
- Calculation Methods: Includes formulas for calculating bolting lengths not explicitly listed in tables, accommodating custom or non-standard installations.
- Joint Types Covered:
- Pipe to pipe flanged joints
- Pipe to valve flanged joints (where valve flange thickness matches the mating flange)
- Assemblies involving steel, bronze, cast iron, and butterfly valves
- Pressure and Size Ranges: Applicable across a wide range of nominal pipe sizes and pressure classes.
Applications
ASTM F704-81(2022) is widely used in the design, procurement, and construction of piping systems to ensure:
- Correct Bolt Sizing: Selection of proper bolt and stud bolt lengths prevents leaks, misalignment, or mechanical failures in high-pressure or high-temperature environments.
- Standardization: Provides uniform bolting practices across projects, supporting compatibility and simplifying maintenance or retrofitting operations.
- Regulatory Compliance: Helps users meet relevant codes and international requirements by referencing standards such as ASME B16.5, B16.24, and MSS-SP-44.
- Marine and Industrial Sectors: Especially relevant for marine piping systems, shipbuilding, refineries, petrochemical plants, and power stations where flanged joint integrity is critical.
- Component Compatibility: Ensures correct mating of different materials (e.g., steel-to-bronze) and joint types (e.g., flat face, raised face, wafer-type valves, lug-type butterfly valves).
Related Standards
- ASME B16.5: Pipe Flanges and Flanged Fittings for NPS 1/2 through NPS 24 (Metric/Inch Standard)
- ASME B16.24: Cast Copper Alloy Pipe Flanges, Flanged Fittings, and Valves (Classes 150-2500)
- ASME B18.2.1: Square, Hex, Heavy Hex, and Askew Head Bolts (Inch Series)
- ASME B18.2.2: Nuts for General Applications (Inch Series)
- ASME B1.1: Unified Inch Screw Threads (UN and UNR Thread Forms)
- MSS-SP-44: Steel Pipe Flanges
These related standards ensure compatibility of flange dimensions, bolt sizes, and thread forms, making ASTM F704-81(2022) an integral resource for anyone tasked with the engineering or maintenance of flanged piping systems.
Keywords: ASTM F704-81(2022), bolting lengths, flanged joints, piping systems, bolt selection, stud bolts, marine technology, ASME B16.5, ASME B16.24, MSS-SP-44, pipe flange bolts, industrial piping, flange joint assembly
Frequently Asked Questions
ASTM F704-81(2022) is a standard published by ASTM International. Its full title is "Standard Practice for Selecting Bolting Lengths for Piping System Flanged Joints". This standard covers: 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 in. through 48 in. (12.7 mm through 1219 mm) diameter and pressure range of 125 psi through 2500 psi (0.8 kPa 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.
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 in. through 48 in. (12.7 mm through 1219 mm) diameter and pressure range of 125 psi through 2500 psi (0.8 kPa 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.
ASTM F704-81(2022) is classified under the following ICS (International Classification for Standards) categories: 21.060.10 - Bolts, screws, studs. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM F704-81(2022) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
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: F704 − 81 (Reapproved 2022) 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.
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 in.
B18.2.1 Square, Hex, Heavy Hex, and Askew Head Bolts
through 48 in. (12.7 mm through 1219 mm) diameter and
and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag
pressure range of 125 psi through 2500 psi (0.8 kPa through
Screws (Inch Series)
17 236 kPa).
B18.2.2 Nuts for General Applications: Machine Screw
NOTE1—Thisisapplicablewhenflangeofvalvehasthesamethickness
Nuts, Hex, Square, Hex Flange, and Coupling Nuts (Inch
as mating flange.
Series)
1.2 The values stated in inch-pound units are to be regarded
2.2 MSS Standards:
as standard. The values given in parentheses are mathematical
MSS-SP-44 Steel Pipe Flanges
conversions to SI units that are provided for information only
and are not considered standard. 3. Bolting Criteria
1.3 This standard does not purport to address all of the
3.1 Bolt and stud bolt lengths are computed using the
safety concerns, if any, associated with its use. It is the
following (see Annex A1):
responsibility of the user of this standard to establish appro-
3.1.1 Includes maximum nut thickness in accordance with
priate safety, health, and environmental practices and deter-
ASME B18.2.2.
mine the applicability of regulatory limitations prior to use.
3.1.2 Does not include washer thickness.
1.4 This international standard was developed in accor-
3.1.3 Does not include bolt or stud bolt point height.
dance with internationally recognized principles on standard-
3.1.4 Includes allowance for up to ⁄8 in. (3.2 mm) thick
ization established in the Decision on Principles for the
gaskets, except butterfly valves.
Development of International Standards, Guides and Recom-
3.1.5 Includes ⁄4 in. (6.3 mm) raised face in addition to
mendations issued by the World Trade Organization Technical
flange thickness listed in tables for flanges rated at 400 psi (2.8
Barriers to Trade (TBT) Committee.
kPa) and above.
3.1.6 Includes use of heavy hex nut and bolt design.
2. Referenced Documents
3.1.7 Includes plus tolerance for flange thickness in accor-
2 dance with ASME B16.5.
2.1 ASME Standards:
B1.1 Unified Inch Screw Threads (UN and UNR Thread
3.2 All bolts and stud bolts have threads in accordance with
Form) ASME B1.1, Class 2A dimensioning and nuts Class 2B.
B16.1 Gray Iron Pipe Flanges and Flanged Fittings: Classes
3.3 The material requirements for bolts, stud bolts, and nuts
25, 125, and 250
are obtained from the material specifications of individual
system diagrams.
1 3.4 Alloy steel bolting 1 in. (25.4 mm) nominal diameter
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
and smaller and all carbon steel bolting has threads of the UNC
Machinery and Piping Systems.
Series; alloy steel bolting above 1-in. nominal diameter has
Current edition approved Oct. 1, 2022. Published October 2022. Originally
ɛ1 threads of the 8-UN Series.
approved in 1981. Last previous edition approved in 2018 as F704 – 81 (2018) .
DOI: 10.1520/F0704-81R22.
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
F704 − 81 (2022)
3.5 For detailed descriptions of flange bolting assemblies,
Bolting Lengths for Tapped Lug-Type Butterfly Valve Table 18
and 150-lb Bronze Flanges to ASME B16.24
butterfly valve bolting assemblies, and tapped lug-type butter-
fly valve bolting assemblies, refer to Figs. 1–7.
4. List of Tables
5. Keywords
4.1 The tables are arranged in the following sequence:
5.1 bolting lengths; cover bolt; flange joint(s); marine tech-
150-lb Steel Flanged Joints Table 1
nology; ships; stud bolts
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.
F704 − 81 (2022)
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.
F704 − 81 (2022)
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.
F704 − 81 (2022)
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
...
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