ASTM F704-81(2014)

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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Oct-2014
• ICS: 21.060.10 - Bolts, screws, studs
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.11 - Machinery and Piping Systems

Relations

• Replaces: ASTM F704-81(2009) - Standard Practice for Selecting Bolting Lengths for Piping System Flanged Joints
• Effective Date: 01-Nov-2014
• Referred By: ASTM F1155-10(2019) - Standard Practice for Selection and Application of Piping System Materials
• Effective Date: 01-Nov-2014

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Designation: F704 − 81 (Reapproved 2014) 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 2.2 MSS Standards:
MSS SP-44 Steel Pipe Flanges
1.1 This practice covers bolt and stud bolt lengths,
quantities, and thread series for pipe to pipe and pipe to valve
3. Bolting Criteria
flanged joints (Note 1) in the nominal pipe size ranges of
1 3.1 Bolt and stud bolt lengths are computed using the
⁄2- through 48-in. (12.7- through 1219-mm) diameter and
following (see Annex A1):
pressure range of 125 through 2500 psi (0.8 through 17 236
3.1.1 Includes maximum nut thickness in accordance with
kPa).
ANSI B18.2.2.
NOTE1—Thisisapplicablewhenflangeofvalvehasthesamethickness
3.1.2 Does not include washer thickness.
as mating flange.
3.1.3 Does not include bolt or stud bolt point height.
1.2 The values stated in inch-pound units are to be regarded 1
3.1.4 Includes allowance for up to ⁄8-in. (3.2-mm) thick
as standard. The values given in parentheses are mathematical
gaskets, except butterfly valves.
conversions to SI units that are provided for information only 1
3.1.5 Includes ⁄4-in. (6.3-mm) raised face in addition to
and are not considered standard.
flange thickness listed in tables for flanges rated at 400 psi (2.8
1.3 This standard does not purport to address all of the kPa) and above.
3.1.6 Includes use of heavy hex nut and bolt design.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.1.7 Includes plus tolerance for flange thickness in accor-
dance with ANSI B16.5.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
3.2 All bolts and stud bolts have threads in accordance with
ANSI B1.1, Class 2A dimensioning and nuts Class 2B.
2. Referenced Documents
3.3 The material requirements for bolts, stud bolts, and nuts
are obtained from the material specifications of individual
2.1 ANSI Standards:
B1.1 Unified Screw Threads system diagrams.
B16.1 Cast Iron Pipe Flanges and Flanged Fittings (25, 125,
3.4 Alloy steel bolting 1-in. (25.4-mm) nominal diameter
250, and 800 lb)
and smaller and all carbon steel bolting has threads of the UNC
B16.5 Steel Pipe Flanges and Flanged Fittings (150, 300,
Series; alloy steel bolting above 1-in. nominal diameter has
400, 600, 900, 1500, and 2500 lb Including Reference to
threads of the 8-UN Series.
Valves)
3.5 For detailed descriptions of flange bolting assemblies,
B16.24 Bronze Flanges and Flanged Fittings (150 and 300
butterfly valve bolting assemblies, and tapped lug-type butter-
lb)
fly valve bolting assemblies, refer to Figs. 1–7.
B18.2.1 Square and Hex Bolts and Screws
B18.2.2 Square and Hex Nuts
4. List of Tables
4.1 The tables are arranged in the following sequence:
150-lb Steel Flanged Joints Table 1
This practice is under the jurisdiction of ASTM Committee F25 on Ships and
300-lb Steel Flanged Joints Table 2
Marine Technology and is the direct responsibility of Subcommittee F25.11 on
400-lb Steel Flanged Joints Table 3
Machinery and Piping Systems.
Current edition approved Nov. 1, 2014. Published November 2014. Originally
approved in 1981. Last previous edition approved in 2009 as F704 – 81 (2009).
DOI: 10.1520/F0704-81R14. AvailablefromManufacturersStandardizationSocietyoftheValveandFittings
Available from American National Standards Institute (ANSI), 25 W. 43rd St., Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-
4th Floor, New York, NY 10036, http://www.ansi.org. hq.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F704 − 81 (2014)
600-lb Steel Flanged Joints Table 4 Bolting Lengths for Tapped Lug- Table 18
900-lb Steel Flanged Joints Table 5 Type Butterfly Valve and 150 lb
1500-lb Steel Flanged Joints Table 6 Bronze Flanges to ANSI B16.24
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
5. Keywords
Bronze Flanged Joints
300-lb Steel Flat Face to 300-lb Table 11
5.1 bolting lengths; cover bolt; flange joint(s); marine tech-
Bronze Flanged Joints
125-lb Cast Iron to 150-lb Steel Flat Table 12 nology; ships; stud bolts
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
Wafer-Type Butterfly Valve and Table 15
150-lb Steel 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
TABLE 1 Bolting Lengths for 150-lb Steel Flanged Joints to ANSI B16.5 and MSS SP-44 (see Fig. 1 and Fig. 2)
Bolt Bolt Length Stud Bolt
Nominal Diameter, Flange Carbon Length
Quantity Bolt Stud
A
Pipe Size, in. Thickness, Steel, Car-
per Joint Bolt Thread
A A
in. in. in. bon Steel,
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 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 (2014)
TABLE 2 Bolting Lengths for 300-lb Steel Flanged Joints to ANSI B16.5 (see Fig. 1 and Fig. 2)
Nominal Bolt Bolt Length Stud Bolt
Pipe Size, Diameter, Flange Carbon Length
Quantity Bolt Stud
A
in. in. Thickness, Steel, Car-
per Joint Bolt Thread
A A
in. in. bon Steel,
A
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 ANSI B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Bolt Length
Pipe Size, Diameter, Quantity Thickness, Bolt Stud Length Al-
Alloy
A A
in. in. per Joint in. Bolt Thread loy
A
Steel, in.
A
Steel, in.
1 BBB B B B
⁄2
BBB B B B
⁄4
BBB B B B
BBB B B B
1 ⁄4
BBB B B B
1 ⁄2
BBB B B B
BBB B B B
2 ⁄2
BBB B B B
BBB B B 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 (2014)
TABLE 4 Bolting Lengths for 600-lb Steel Flanged Joints to ANSI B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Bolt Length
Pipe Size, Diameter, Quantity Thickness, Bolt Stud Length Al-
Alloy
A A
in. in. per Joint in. Bolt Thread loy
A
Steel, in.
A
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 ANSI B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Bolt Length
Pipe Size, Diameter, Quantity Thickness, Bolt Stud Length Al-
Alloy
A A
in. in. per Joint in. Bolt Thread loy
A
Steel, in.
A
Steel, in.
BBB B B B
⁄2
BBB B B B
⁄4
BBB B B B
BBB B B B
1 ⁄4
BBB B B B
1 ⁄2
BBB B B B
BBB B B 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 (2014)
TABLE 6 Bolting Lengths for 1500-lb Steel Flanged Joints to ANSI B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Bolt Length
Pipe Size, Diameter, Quantity Thickness, Bolt Stud Length Al-
Alloy
A A
in. in. per Joint in. Bolt Thread loy
A
Steel, in.
A
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 ANSI B16.5 (see Fig. 3 and Fig. 4)
Bolt Flange Stud Bolt
Nominal Bolt Length
Diameter, Quantity Thickness, Bolt Stud Length Al-
Pipe Size, Alloy
A A
in. per Joint in. Bolt Thread loy
A
in. Steel, in.
A
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.
F704 − 81 (2014)
TABLE 8 Bolting Lengths for 150-lb Bronze Flanged Joints to ANSI B16.24 (see Fig. 1 and Fig. 2)
Bolt Flange Bolt Length Stud Bolt
Nominal Diameter, Thickness, Carbon Length
Quantity Bolt Stud
A A
Pipe Size, in. in. Steel, Car-
per Joint Bolt Thread
A
in. in. bon Steel,
A
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-2A 1 ⁄4 2 ⁄4
5 1 5 3
2 ⁄8 4 ⁄2 ⁄8-11 UNC-2A 2 2 ⁄4
1 5 9 5 1 3
2 ⁄2 ⁄8 4 ⁄16 ⁄8-11 UNC-2A 2 ⁄4 2 ⁄4
5 5 5 1
3 ⁄8 4 ⁄8 ⁄8-11 UNC-2A 2 ⁄4 3
1 5 11 5 1
3 ⁄2 ⁄8 8 ⁄16 ⁄8-11 UNC-2A 2 ⁄2 3
5 11 5 1
4 ⁄8 8 ⁄16 ⁄8-11 UNC-2A 2 ⁄2 3
3 3 3 3 1
5 ⁄4 8 ⁄4 ⁄4-10 UNC-2A 2 ⁄4 3 ⁄2
3 13 3 1
6 ⁄4 8 ⁄16 ⁄4-10 UNC-2A 3 3 ⁄2
3 15 3 1 3
8 ⁄4 8 ⁄16 ⁄4-10 UNC-2A 3 ⁄4 3 ⁄4
7 7 1 1
10 ⁄8 12 1 ⁄8-9 UNC-2A 3 ⁄2 4 ⁄4
7 1 7 1 1
12 ⁄8 12 1 ⁄6 ⁄8-9 UNC-2A 3 ⁄2 4 ⁄4
A
1 in. = 25.4 mm.
TABLE 9 Bolting Lengths for 300-lb Bronze Flanged Joints to ANSI B16.24 (see Fig. 1 and Fig. 2)
Bolt Flange Bolt Length Stud Bol
...

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: F704 − 81 (Reapproved 2009) F704 − 81 (Reapproved 2014)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.
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 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 the standard. The values given in parentheses are for information
only. 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2.1 ANSI Standards:
B1.1 Unified Screw Threads
B16.1 Cast Iron Pipe Flanges and Flanged Fittings (25, 125, 250, and 800 lb)
B16.5 Steel Pipe Flanges and Flanged Fittings (150, 300, 400, 600, 900, 1500, and 2500 lb Including Reference to Valves)
B16.24 Bronze Flanges and Flanged Fittings (150 and 300 lb)
B18.2.1 Square and Hex Bolts and Screws
B18.2.2 Square and Hex Nuts
2.2 Other Standard:MSS Standards:
MSS 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 ANSI B18.2.2.
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 ANSI B16.5.
3.2 All bolts and stud bolts have threads in accordance with ANSI B1.1, Class 2A dimensioning and nuts Class 2B.
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 Jan. 1, 2009Nov. 1, 2014. Published March 2009November 2014. Originally approved in 1981. Last previous edition approved in 20012009 as
F704 – 81 (2001).(2009). DOI: 10.1520/F0704-81R09.10.1520/F0704-81R14.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F704 − 81 (2014)
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
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
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
Wafer-Type Butterfly Valve and Table 15
150-lb Steel 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- Table 18
Type Butterfly Valve and 150 lb
Bronze Flanges to ANSI B16.24
5. Keywords
5.1 bolting lengths; cover bolt; flange joint(s); marine technology; ships; stud bolts
F704 − 81 (2014)
TABLE 1 Bolting Lengths for 150-lb Steel Flanged Joints to ANSI B16.5 and MSS SP-44 (see Fig. 1 and Fig. 2)
Bolt Bolt Length Stud Bolt
Nominal Diameter, Flange Carbon Length
Quantity Bolt Stud
A
Pipe Size, in. Thickness, Steel, Car-
per Joint Bolt Thread
A A
in. in. in. bon Steel,
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 ANSI B16.5 (see Fig. 1 and Fig. 2)
Nominal Bolt Bolt Length Stud Bolt
Pipe Size, Diameter, Flange Carbon Length
Quantity Bolt Stud
A
in. in. Thickness, Steel, Car-
per Joint Bolt Thread
A A
in. in. bon Steel,
A
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.
F704 − 81 (2014)
TABLE 3 Bolting Lengths for 400-lb Steel Flanged Joints to ANSI B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Bolt Length
Pipe Size, Diameter, Quantity Thickness, Bolt Stud Length
Alloy
A A
in. in. per Joint in. Bolt Thread Alloy
A
Steel, in.
A
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
1 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 ANSI B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Bolt Length
Pipe Size, Diameter, Quantity Thickness, Bolt Stud Length
Alloy
A A
in. in. per Joint in. Bolt Thread Alloy
A
Steel, in.
A
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.
F704 − 81 (2014)
TABLE 5 Bolting Lengths for 900-lb Steel Flanged Joints to ANSI B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Bolt Length
Pipe Size, Diameter, Quantity Thickness, Bolt Stud Length
Alloy
A A
in. in. per Joint in. Bolt Thread Alloy
A
Steel, in.
A
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
1 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 ANSI B16.5 (see Fig. 3 and Fig. 4)
Nominal Bolt Flange Stud Bolt
Bolt Length
Pipe Size, Diameter, Quantity Thickness, Bolt Stud Length
Alloy
A A
in. in. per Joint in. Bolt Thread Alloy
A
Steel, in.
A
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
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.
F704 − 81 (2014)
TABLE 7 Bolting Lengths for 2500-lb Steel Flanged Joints to ANSI B16.5 (see Fig. 3 and Fig. 4)
Bolt Flange Stud Bolt
Nominal Bolt Length
Diameter, Quantity Thickness, Bolt Stud Length
Pipe Size, Alloy
A A
in. per Joint in. Bolt Thread Alloy
A
in. Steel, in.
A
Steel, in.
1 3 3 3 3
⁄2 ⁄4 4 1 ⁄16 ⁄4-10 UNC-2A not used 4 ⁄4
3 3 1 3
⁄4 ⁄4 4 1 ⁄4 ⁄4-10 UNC-2A not used 5
7 3 7 1
1 ⁄8 4 1 ⁄8 ⁄8-9 UNC-2A not used 5 ⁄2
1 1
1 ⁄4 1 4 1 ⁄2 1-8 UNC-2A not used 6
1 1 3 1 3
1 ⁄2 1 ⁄8 4 1 ⁄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 8 2 ⁄4 1 ⁄8-8 UN-2A not used 7 ⁄4
1 5 1 3
3 1 ⁄4 8 2 ⁄8 1 ⁄4-8 UN-2A not used 8 ⁄4
1 1
4 1 ⁄2 8 3 1 ⁄2-8 UN-2A not used 10
3 5 3 3
5 1 ⁄4 8 3 ⁄8 1 ⁄4-8 UN-2A not used 11 ⁄4
1 1
6 2 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 ANSI B16.24 (see Fig. 1 and Fig. 2)
Bolt Flange Bolt Length Stud Bolt
Nominal Diameter, Thickness, Carbon Length
Quantity Bolt Stud
A A
Pipe Size, in. in. Steel, Car-
per Joint Bolt Thread
A
in. in. bon Steel,
A
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-2A 1 ⁄4 2 ⁄4
5 1 5 3
2 ⁄8 4 ⁄2 ⁄8-11 UNC-2A 2 2 ⁄4
1 5 9 5 1 3
2 ⁄2 ⁄8 4 ⁄16 ⁄8
...