Flange Bolt Chart

Lookup flange bolt lengths, wrench sizes, and torque sequences right on your phone. In seconds.

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Flange Bolt Chart app: With bolt lengths, wrench sizes, and torque patterns.

Flange Bolt Chart - Bolt Lengths, Wrench Sizes & Torque Patterns

150 LB. Flanges

Nominal Pipe Size
(inches)
Wrench Size
(inches)
Number of StudsDiameter of Studs
(inches)
Length of Stud - RF
(inches)
Length of Stud - RTJ
(inches)
Suggested Torque
1/27/840.52-1/4 30
3/47/840.52-1/2 30
17/840.52-1/2340
1-1/47/840.52-3/43-1/440
1-1/27/840.52-3/43-1/440
21-1/1640.633-1/43-3/480
2-1/21-1/1640.633-1/2480
31-1/1640.633-1/24110
3-1/21-1/1680.633-1/2480
41-1/1680.633-1/24100
51-1/480.753-3/44-1/4120
61-1/480.7544-1/2130
81-1/480.754-1/44-3/4130
101-7/16120.884-1/25215
121-7/16120.884-3/45-1/4220
141-5/81215-1/45-3/4320
161-5/81615-1/45-3/4320
181-13/16161.135-3/46-1/4450
201-13/16201.136-1/46-3/4450
242201.256-3/47-1/4650

300 LB. Flanges

Nominal Pipe Size
(inches)
Wrench Size
(inches)
Number of StudsDiameter of Studs
(inches)
Length of Stud - RF
(inches)
Length of Stud - RTJ
(inches)
Suggested Torque
1/27/840.52-1/2340
3/41-1/1640.6333-1/260
11-1/1640.6333-1/280
1-1/41-1/1640.633-1/43-3/480
1-1/21-1/440.753-1/24110
21-1/1680.633-1/24110
2-1/21-1/480.7544-1/2150
31-1/480.754-1/44-3/4150
3-1/21-1/480.754-1/45150
41-1/480.754-1/25180
51-1/480.754-3/45-1/4180
61-1/4120.754-3/45-1/2170
81-7/16120.885-1/26265
101-5/81616-1/46-3/4320
121-13/16161.136-3/47-1/4450
141-13/16201.1377-1/2450
162201.257-1/28650
182241.257-3/48-1/4650
202241.2588-3/4650
242-3/8241.59101200

600 LB. Flanges

Nominal Pipe Size
(inches)
Wrench Size
(inches)
Number of StudsDiameter of Studs
(inches)
Length of Stud - RF
(inches)
Length of Stud - RTJ
(inches)
Suggested Torque
1/27/840.53340
3/41-1/1640.633-1/23-1/260
11-1/1640.633-1/23-1/280
1-1/41-1/1640.633-3/43-3/4110
1-1/21-1/440.754-1/44-1/4110
21-1/1680.634-1/44-1/4110
2-1/21-1/480.754-3/44-3/4150
31-1/480.7555150
3-1/21-7/1680.885-1/25-1/2200
41-7/1680.885-3/45-3/4225
51-5/8816-1/26-1/2350
61-5/81216-3/46-3/4320
81-13/16121.137-1/27-3/4450
102161.258-1/28-1/2650
122201.258-3/48-3/4675
142-5/8201.389-1/49-1/4820
162-3/8201.510101125
182-9/16201.6310-3/410-3/41430
202-9/16241.6311-1/411-1/21400
242-15/16241.881313-1/42230

900 LB. Flanges

Nominal Pipe Size
(inches)
Wrench Size
(inches)
Number of StudsDiameter of Studs
(inches)
Length of Stud - RF
(inches)
Length of Stud - RTJ
(inches)
Suggested Torque
1/21-1/440.754-1/44-1/480
3/41-1/440.754-1/24-1/290
11-7/1640.8855110
1-1/41-7/1640.8855170
1-1/21-5/8415-1/25-1/2240
21-7/1680.885-3/45-3/4170
2-1/21-5/8816-1/46-1/4240
31-7/1680.885-3/45-3/4215
41-13/1681.136-3/46-3/4450
5281.257-1/27-1/2650
61-13/16121.137-1/27-3/4455
81-3/16121.388-3/48-3/4820
102-3/16161.389-1/49-1/4850
122-3/16201.381010870
142-5/8201.510-3/4111125
162-9/16201.6311-1/411-1/21430
182-15/16201.8812-3/413-1/42230
203-1/820213-3/414-1/42300
243-7/8202.517-1/4185500

1500 LB. Flanges

Nominal Pipe Size
(inches)
Wrench Size
(inches)
Number of StudsDiameter of Studs
(inches)
Length of Stud - RF
(inches)
Length of Stud - RTJ
(inches)
Suggested Torque
1/21-1/440.754-1/44-1/480
3/41-1/440.754-1/24-1/290
11-7/1640.8855110
1-1/41-7/1640.8855170
1-1/21-5/8415-1/25-1/2240
21-7/1680.885-3/45-3/4170
2-1/21-5/8816-1/46-1/4240
31-13/1681.1377370
4281.257-3/47-3/4650
52-3/881.59-3/49-3/41000
62-3/16121.3810-1/410-1/2820
82-9/16121.6311-1/212-3/41400
102-15/16121.8813-1/413-1/22100
123-1/816214-3/415-1/42300
143-1/2162.251616-3/43400
163-7/8162.517-1/218-1/24300
184-1/4162.7519-1/220-3/46200
204-5/816321-1/422-1/47800
245-3/8163.524-1/425-1/213000

2500 LB. Flanges

Nominal Pipe Size
(inches)
Wrench Size
(inches)
Number of StudsDiameter of Studs
(inches)
Length of Stud - RF
(inches)
Length of Stud - RTJ
(inches)
Suggested Torque
1/21-1/440.754-3/44-3/4150
3/41-1/440.7555150
11-7/1640.885-1/25-1/2170
1-1/41-5/84166300
1-1/21-13/1641.136-3/46-3/4400
21-5/88177300
2-1/21-13/1681.137-3/48400
3281.258-3/49600
42-3/881.51010-1/4650
52-3/481.7511-3/412-1/41500
63-1/88213-1/2142300
83-1/81221515-1/22400
103-7/8122.519-1/4204900
124-1/4122.7521-1/4227900

About the App

Look up flange bolt sizes and torque patterns in three taps with Flange Bolt. 

Just enter the flange size, type, and class, and the tool instantly shows the ASME values for:

1. Number of studs

2. Diameter of studs

3. Length of studs

4. Torque pattern

5. Suggested torque amount

All values other than suggested torque amount are sourced directly from flange bolt charts and flange torque charts in the ASME B16.5 "Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard" (2017).

Looking up flange bolt sizes and torque patterns with Flange Bolt is far faster and less error prone than searching through PDF charts and tables. The sole purpose of the tool is to make it as simple as possible for a pipefitters, steamfitters, and others working in piping to look up flange bolt size and torque pattern information. 

Is there a feature you'd like from Flange Bolt that you don't see? Request it through the app and we'll do our best to add it to the development schedule.

Features of the app:

1. Full offline capability: No internet connection necessary to use. All data is stored locally on your phone. (The app requires minimum storage space overall)

2. Instant flange bolt sizes and torque patterns: Just enter the flange size, class, and type and the app instantly populates the correct values from the flange bolt size chart and the flange torque sequence chart, along with wrench size.

3. Flange torque sequence image: Each lookup shows the correct flange torque sequence image in picture form, with the studs numbered.

4. Suggested torque values

The information in this app covers:

(1) flanges with rating class designations 150, 300, 400, 600, 900, and 1500 in sizes NPS 1/2 through NPS 24 and flanges with rating class designation 2500 in sizes NPS 1/2 through NPS 12, with requirements given in U.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units;

(2) flanged fittings with rating class designation 150 and 300 in sizes NPS 1/2 through NPS 24, with requirements given in U.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units;

(3) flanged fittings with rating class designation 400, 600, 900, and 1500 in sizes NPS 1/2 through NPS 24 and flanged fittings with rating class designation 2500 in sizes NPS 1/2 through NPS 12  in U.S. Customary units.

That includes:

- 4 bolt flange pattern

- 8 bolt flange pattern

- 12 bolt flange pattern

- 16 bolt flange pattern

- 20 bolt flange pattern

- 14 bolt flange pattern