Draw Bolt Pattern Circle Sketchup

Flange dimensions are determined by the pipe size and the pressure class required for the application. Flanges are standardized co-ordinate publications from organizations like ASME, MSS, API and others.

ASME/ANSI B16.5 provides

• weld cervix
• slip-on
• socket weld
• threaded
• lap joint
• blind

flange dimensions for pipes ranging ane/ii" to 24" - in classes ranging 150 to 2500. Note that the ratings are in steps with terminology likeASME class xxx or API xxxx.

In general yous demand to specify the schedule (thickness) of the connected pipage when it is existence butt welded to the flange. Socket welded and threaded connections is unaffected by wall thickness and should only crave the OD.

• Steel Pipe Dimensions - Schedule 40
• Steel Pipe Dimensions - Schedule lxxx

Nominal Pipe Size NPS (inches)	Class 150
	Diameter of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Diameter of Bolt Holes (inches)	Bolt Circle (inches)
1/4	3-3/8	iv	one/2	0.62	2-i/4
one/2	3-1/2	iv	1/two	0.62	2-3/8
3/4	3-7/8	iv	one/2	0.62	2-3/4
1	4-1/4	4	i/two	0.62	3-ane/eight
i-1/four	iv-five/8	four	one/2	0.62	3-1/2
1-1/2	5	4	1/two	0.62	three-7/8
ii	6	4	5/viii	0.75	4-three/4
two-1/two	7	4	5/eight	0.75	5-1/2
iii	seven-one/2	4	five/eight	0.75	6
iii-one/two	8-ane/ii	8	5/8	0.75	7
4	ix	eight	5/8	0.75	7-one/two
5	x	viii	three/4	0.88	8-1/2
6	11	eight	3/4	0.88	9-1/ii
viii	thirteen-1/two	eight	3/4	0.88	11-three/4
x	16	12	7/8	i	fourteen-1/4
12	xix	12	7/8	1	17
14	21	12	i	one.12	18-3/4
sixteen	23-ane/2	16	ane	ane.12	21-one/4
18	25	sixteen	i-1/8	1.25	22-iii/4
20	27-1/2	20	i-1/8	one.25	25
24	32	20	1-ane/four	1.38	29-1/2

• 1 inch = 25.four mm

Nominal Pipe Size NPS (inches)	Form 300
	Bore of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Diameter of Commodities Holes (inches)	Bolt Circle (inches)
one/4	iii-3/8	4	i/ii	0.62	2-1/four
i/2	3-3/4	4	1/2	0.62	2-5/eight
3/4	4-5/8	four	5/8	0.75	3-ane/four
1	four-7/eight	iv	5/8	0.75	3-i/2
1-1/four	v-1/four	4	5/8	0.75	3-7/viii
one-1/2	six-1/8	4	3/iv	0.88	iv-1/2
ii	six-1/2	8	5/8	0.75	5
ii-1/ii	7-1/2	8	3/4	0.88	5-7/8
3	8-one/4	8	3/iv	0.88	6-v/eight
iii-i/2	nine	8	3/4	0.88	7-1/4
four	x	eight	3/four	0.88	vii-vii/8
5	eleven	8	three/4	0.88	9-i/4
6	12-1/2	12	iii/4	0.88	ten-5/8
8	15	12	7/8	1	xiii
10	17-1/2	sixteen	1	ane.12	fifteen-1/4
12	xx-i/2	xvi	1-one/8	ane.25	17-iii/4
14	23	20	ane-1/8	i.25	twenty-ane/4
16	25-1/2	xx	i-1/four	1.38	22-1/ii
eighteen	28	24	one-i/4	ane.38	24-3/4
twenty	thirty-1/2	24	i-ane/4	1.38	27
24	36	24	ane-1/2	i.62	32

Nominal Pipe Size NPS (inches)	Class 400
	Diameter of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Bore of Bolt Holes (inches)	Bolt Circumvolve (inches)
ane/4	3-3/8	4	one/two	0.62	2-1/4
1/2	3-3/iv	four	one/two	0.62	2-5/viii
3/4	4-5/8	iv	v/eight	0.75	3-1/4
i	iv-vii/8	four	v/viii	0.75	three-1/2
1-1/iv	5-1/four	4	5/eight	0.75	3-7/eight
i-i/ii	6-ane/eight	4	3/4	0.88	4-ane/2
two	6-1/2	8	5/8	0.75	5
2-one/2	seven-1/2	8	3/four	0.88	v-7/eight
three	8-one/four	8	3/4	0.88	vi-v/8
3-1/2	nine	8	7/eight	one	seven-1/4
four	10	eight	7/eight	ane	7-7/8
5	11	8	7/8	1	9-1/4
half-dozen	12-1/2	12	vii/eight	i	10-v/8
viii	15	12	1	1.12	13
10	17-1/two	16	ane-1/viii	1.25	15-1/4
12	xx-1/2	16	i-i/iv	ane.38	17-3/4
14	23	twenty	i-1/4	1.38	20-ane/4
sixteen	25-1/2	20	1-iii/8	1.5	22-1/2
18	28	24	one-3/8	1.five	24-3/4
20	thirty-i/two	24	1-1/ii	1.62	27
24	36	24	1-3/iv	1.88	32

Nominal Pipe Size NPS (inches)	Class 600
	Diameter of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Diameter of Bolt Holes (inches)	Bolt Circle (inches)
one/4	three-3/eight	four	1/2	0.62	2-one/4
1/2	3-three/four	iv	1/ii	0.62	2-5/8
3/4	4-v/eight	iv	5/8	0.75	three-i/4
1	iv-7/eight	four	5/8	0.75	3-one/ii
ane-1/iv	5-1/4	4	5/8	0.75	three-seven/eight
one-i/2	6-1/8	4	3/4	0.88	iv-1/2
2	6-one/2	8	5/viii	0.75	5
ii-one/ii	7-i/2	viii	3/four	0.88	5-7/8
three	8-ane/4	viii	3/iv	0.88	six-v/8
3-1/2	nine	8	7/8	ane	7-one/4
4	10-3/4	8	7/8	i	8-ane/2
five	13	8	ane	1.12	x-1/2
6	fourteen	12	1	1.12	11-1/2
8	16-i/ii	12	1-one/eight	ane.25	13-3/4
x	20	16	ane-1/4	1.38	17
12	22	twenty	one-1/four	1.38	xix-i/4
fourteen	23-3/four	20	1-3/viii	1.five	20-3/4
16	27	20	1-1/2	i.62	23-3/4
18	29-i/four	20	1-5/viii	1.75	25-iii/4
xx	32	24	1-v/eight	1.75	28-1/ii
24	37	24	1-7/eight	2	33

Nominal Pipe Size NPS (inches)	Class 900
	Diameter of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Diameter of Bolt Holes (inches)	Bolt Circumvolve (inches)
1/2	4-3/4	4	3/4	0.88	3-ane/4
three/iv	5-1/8	4	three/four	0.88	three-1/ii
one	five-7/8	4	7/8	1	4
1-1/4	6-1/iv	4	7/8	1	4-3/eight
ane-1/2	seven	4	1	i.12	4-seven/8
2	eight-1/2	8	7/eight	1	half-dozen-1/2
two-1/ii	9-5/8	eight	1	1.12	7-one/2
3	9-1/ii	8	seven/viii	1	7-i/2
4	eleven-1/two	viii	1-one/8	one.25	9-ane/4
five	13-3/4	8	1-1/four	1.38	11
6	15	12	1-1/8	1.25	12-1/2
8	18-1/2	12	1-iii/viii	1.5	xv-one/2
10	21-1/2	sixteen	i-three/8	1.five	18-1/2
12	24	twenty	1-3/8	1.v	21
14	25-1/4	20	1-1/2	1.62	22
16	27-three/iv	twenty	ane-5/eight	1.75	24-i/2
xviii	31	20	one-7/8	2	27
twenty	33-3/4	twenty	2	2.12	29-1/2
24	41	twenty	2-1/2	2.62	35-1/ii

Nominal Pipe Size NPS (inches)	Class 1500
	Bore of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Diameter of Bolt Holes (inches)	Bolt Circle (inches)
1/2	four-3/4	iv	3/4	0.88	3-1/4
3/iv	5-1/viii	four	3/four	0.88	three-1/2
1	five-7/8	four	7/8	1	4
1-1/4	6-1/iv	4	7/viii	1	four-3/8
i-1/2	7	4	1	1.12	4-seven/8
ii	8-1/two	8	7/viii	i	half-dozen-1/2
2-1/2	9-5/viii	8	1	1.12	7-one/ii
3	x-ane/2	viii	1-one/8	1.25	8
4	12-1/four	8	i-i/4	ane.38	ix-i/2
5	fourteen-3/iv	8	ane-ane/2	ane.62	11-1/2
half dozen	fifteen-1/ii	12	i-3/viii	1.5	12-one/2
8	19	12	1-5/8	1.75	15-1/ii
10	23	12	1-vii/8	2	19
12	26-1/2	16	2	ii.12	22-1/2
xiv	29-one/2	16	2-i/4	2.38	25
16	32-one/2	16	2-i/2	2.62	27-3/4
18	36	xvi	2-3/4	2.88	30-one/2
20	38-3/4	16	3	3.12	32-3/4
24	46	xvi	3-1/2	iii.62	39

Nominal Pipe Size NPS (inches)	Grade 2500
	Diameter of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Bore of Commodities Holes (inches)	Bolt Circle (inches)
1/2	five-1/4	4	three/4	0.88	3-1/ii
iii/four	5-1/two	4	3/iv	0.88	3-3/4
1	6-1/4	4	7/8	1	4-1/4
one-1/iv	7-1/4	iv	1	1.12	5-1/eight
1-1/ii	8	four	ane-1/8	1.25	5-iii/four
2	9-one/4	viii	1	i.12	6-iii/iv
2-one/2	x-ane/2	eight	1-1/8	one.25	vii-3/iv
three	12	8	1-ane/four	i.38	9
four	14	8	one-1/2	1.62	ten-3/4
v	16-1/2	eight	i-three/iv	1.88	12-3/iv
6	nineteen	8	2	2.12	14-one/two
8	21-iii/4	12	ii	ii.12	17-1/iv
10	26-1/two	12	ii-one/2	2.62	21-one/4
12	xxx	12	2-three/iv	2.88	24-three/8

Insert flanges to your Sketchup model with the Engineering ToolBox Sketchup Extension

newtoncouttepore.blogspot.com

Source: https://www.engineeringtoolbox.com/flanges-bolts-dimensions-d_464.html

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