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Common Flange Specifications By Type

See Common Flange Specs by Size
See legend below for explanations

NW 16 CF/Mini

Flange I.D. (max)0.630 (16)
Flange O.D.1.33 (34)
Bolt Circle1.063 (27)
Bolt Hole0.169 (4.3)
# of Bolts6
# of ClampsNone Required
Bolt Size832 x 3/4 (#)

NW 25 CF/2-1/8″

Flange I.D. (max)0.88 (22.2)
Flange O.D.2.11 (53.6)
Bolt Circle1.625 (41.3)
Bolt Hole0.265 (6.7)
# of Bolts4
# of ClampsNone Required
Bolt Size1/4-28 x 1 1/4 (#)

NW 35 CF/2-3/4″

Flange I.D. (max)1.500 (38.1)
Flange O.D.2.75 (69.9)
Bolt Circle2.312 (58.7)
Bolt Hole0.265 (6.7)
# of Bolts6
# of ClampsNone Required
Bolt Size1/4-28 x 1 1/4 (#)

NW 63 CF/4 1/2″

Flange I.D. (max)2.500 (63.5)
Flange O.D.4.47 (113.5)
Bolt Circle3.628 (92.2)
Bolt Hole0.332 (8.4)
# of Bolts8
# of ClampsNone Required
Bolt Size5/16-24 x 2 (#)

NW 75 CF/4 5/8″

Flange I.D. (max)2.88 (73)
Flange O.D.4.62 (117.35)
Bolt Circle4.030 (102.4)
Bolt Hole0.332 (8.4)
# of Bolts10
# of ClampsNone Required
Bolt Size5/16-24 x 2 (#)

NW 100 CF/6″

Flange I.D. (max)4.00 (101.6)
Flange O.D.5.97 (151.6)
Bolt Circle5.128 (130.3)
Bolt Hole0.332 (8.4)
# of Bolts16
# of ClampsNone Required
Bolt Size5/16-24 x 2 1/4 (#)

NW 130 CF/6 3/4″

Flange I.D. (max)4.87 (123.7)
Flange O.D.6.75 (171.45)
Bolt Circle5.969 (151.6)
Bolt Hole0.332 (8.4)
# of Bolts18
# of ClampsNone Required
Bolt Size5/16-24 x 2 1/4 (#)

NW 150 CF/8″

Flange I.D. (max)6.00 (152.4)
Flange O.D.7.97 (202.4)
Bolt Circle7.128 (181.1)
Bolt Hole0.332 (8.4)
# of Bolts20
# of ClampsNone Required
Bolt Size5/16-24 x 2 1/4 (#)

NW 200 CF/10″

Flange I.D. (max)8.00 (203.2)
Flange O.D.9.97 (253.2)
Bolt Circle9.128 (231.9)
Bolt Hole0.332 (8.4)
# of Bolts24
# of ClampsNone Required
Bolt Size5/16-24 x 2 1/2 (#)

NW 250 CF/12″

Flange I.D. (max)9.843 (250.0)
Flange O.D.12.05 (306)
Bolt Circle11.18 (284)
Bolt Hole0.332 (8.4)
# of Bolts32
# of ClampsNone Required
Bolt Size5/16-24 x 2 1/2 (#)

NW 275 CF/13 1/4″

Flange I.D. (max)10.63 (270)
Flange O.D.13.25 (336.55)
Bolt Circle12.06 (306.3)
Bolt Hole0.390 (9.9)
# of Bolts30
# of ClampsNone Required
Bolt Size3/8-24 x 2 1/2 (#)

NW 63 ISO-F

Flange I.D. (max)2.37 (60.20)
Flange O.D.3.74 (95.0)
Bolt Circle
Bolt Hole0.35 (8.9) (+)
# of Bolts4
# of Clamps4 (++)
Bolt SizeM8 x 40

NW 80 ISO-F

Flange I.D. (max)2.87 (72.90)
Flange O.D.4.33 (110)
Bolt Circle
Bolt Hole0.35 (8.9) (+)
# of Bolts4
# of Clamps4 (++)
Bolt SizeM8 x 40

NW 100 ISO-F

Flange I.D. (max)3.83 (97.28)
Flange O.D.5.12 (130)
Bolt Circle
Bolt Hole0.35 (8.9) (+)
# of Bolts4
# of Clamps4 (++)
Bolt SizeM8 x 40

NW 160 ISO-F

Flange I.D. (max)5.87 (149.10)
Flange O.D.7.09 (180)
Bolt Circle
Bolt Hole0.43 (10.9) (+)
# of Bolts4
# of Clamps4 (++)
Bolt SizeM10 x 50

NW 200 ISO-F

Flange I.D. (max)7.83 (198.90)
Flange O.D.9.45 (240)
Bolt Circle
Bolt Hole0.43 (10.9) (+)
# of Bolts6
# of Clamps6 (++)
Bolt SizeM10 x 50

NW 250 ISO-F

Flange I.D. (max)12.42 (315.47)
Flange O.D.14.57 (370)
Bolt Circle
Bolt Hole0.43 (10.9) (+)
# of Bolts6
# of Clamps6 (++)
Bolt SizeM10 x 50

NW 320 ISO-F

Flange I.D. (max)12.42 (315.47)
Flange O.D.14.57 (370)
Bolt Circle
Bolt Hole0.51 (13.0) (+)
# of Bolts8
# of Clamps8 (++)
Bolt SizeM12 x 60

NW 400 ISO-F

Flange I.D. (max)15.50 (393.70)
Flange O.D.17.72 (450)
Bolt Circle
Bolt Hole0.51 (13.0) (+)
# of Bolts8
# of Clamps8 (++)
Bolt SizeM12 x 60

NW 500 ISO-F

Flange I.D. (max)19.50 (495.30)
Flange O.D.21.65 (550)
Bolt Circle
Bolt Hole0.51 (13.0) (+)
# of Bolts12
# of Clamps12 (++)
Bolt SizeM12 x 60

NW 63 ISO-Bolt Flange

Flange I.D. (max)2.37 (60.20)
Flange O.D.5.12 (130)
Bolt Circle4.331 (110)
Bolt HoleM8
# of Bolts4
# of Clamps4
Bolt SizeM8 x 40

NW 80 ISO-Bolt Flange

Flange I.D. (max)2.87 (72.90)
Flange O.D.5.71 (145)
Bolt Circle4.920 (125)
Bolt HoleM8
# of Bolts4
# of Clamps4
Bolt SizeM8 x 40

NW 100 ISO-Bolt Flange

Flange I.D. (max)3.83 (97.28)
Flange O.D.6.496 (165)
Bolt Circle5.709 (145)
Bolt HoleM8
# of Bolts8
# of Clamps4
Bolt SizeM8 x 40

NW 160 ISO-Bolt Flange

Flange I.D. (max)5.87 (149.10)
Flange O.D.8.858 (225)
Bolt Circle7.874 (200)
Bolt HoleM10
# of Bolts8
# of Clamps4
Bolt SizeM10 x 50

NW 200 ISO-Bolt Flange

Flange I.D. (max)7.83 (198.90)
Flange O.D.11.22 (285)
Bolt Circle10.236 (260)
Bolt HoleM10
# of Bolts12
# of Clamps6
Bolt SizeM10 x 50

NW 250 ISO-Bolt Flange

Flange I.D. (max)9.75 (247.65)
Flange O.D.13.189 (335)
Bolt Circle12.205 (310)
Bolt HoleM10
# of Bolts12
# of Clamps6
Bolt SizeM10 x 50

NW 320 ISO-Bolt Flange

Flange I.D. (max)12.42 (315.47)
Flange O.D.16.732 (425)
Bolt Circle15.551 (395)
Bolt HoleM12
# of Bolts12
# of Clamps8
Bolt SizeM12 x 60

NW 400 ISO-Bolt Flange

Flange I.D. (max)15.50 (393.70)
Flange O.D.20.08 (510)
Bolt Circle18.90 (480)
Bolt HoleM12
# of Bolts16
# of Clamps8
Bolt SizeM12 x 60

NW 500 ISO-Bolt Flange

Flange I.D. (max)19.50 (495.30)
Flange O.D.24.02 (610)
Bolt Circle22.83 (580)
Bolt HoleM12
# of Bolts16
# of Clamps12
Bolt SizeM12 x 60

1.5″ ASA

Flange I.D. (max)2.200 (55.9)
Flange O.D.5.00 (127.0)
Bolt Circle3.875 (98.4)
Bolt Hole0.62 (15.9)
# of Bolts4
# of ClampsNone Required
Bolt Size1/2-13 x 1 1/2

2″ ASA

Flange I.D. (max)3.00 (76.2)
Flange O.D.6.00 (152.6)
Bolt Circle4.750 (120.7)
Bolt Hole0.75 (19.1)
# of Bolts4
# of ClampsNone Required
Bolt Size5/8-11 x 1 3/4

3″ ASA

Flange I.D. (max)4.20 (107)
Flange O.D.7.50 (190.5)
Bolt Circle6.00 (152.4)
Bolt Hole0.75 (19.1)
# of Bolts8
# of ClampsNone Required
Bolt Size5/8-11 x 1 3/4

4″ ASA

Flange I.D. (max)5.70 (145)
Flange O.D.9.00 (228.6)
Bolt Circle7.500 (190.5)
Bolt Hole0.75 (19.1)
# of Bolts8
# of ClampsNone Required
Bolt Size5/8-11 x 1 3/4

6″ ASA

Flange I.D. (max)7.6 (193)
Flange O.D.11.0 (279.4)
Bolt Circle9.500 (241.3)
Bolt Hole0.81 (20.6)
# of Bolts8
# of ClampsNone Required
Bolt Size3/4-10 x 2 1/4

8″ ASA

Flange I.D. (max)10.276 (261.0)
Flange O.D.13.50 (342.9)
Bolt Circle11.750 (298.5)
Bolt Hole0.81 (20.6)
# of Bolts8
# of ClampsNone Required
Bolt Size3/4-10 x 2 1/4

10″ ASA

Flange I.D. (max)12.00 (304.8)
Flange O.D.16.00 (406.4)
Bolt Circle14.250 (362)
Bolt Hole0.81 (20.6)
# of Bolts12
# of ClampsNone Required
Bolt Size3/4-10 x 2 1/4

16″ ASA

Flange I.D. (max)18.00 (457.2)
Flange O.D.23.50 (596.9)
Bolt Circle21.25 (539.5)
Bolt Hole1.12 (28)
# of Bolts16
# of ClampsNone Required
Bolt Size7/8-9 x 3

20″ ASA

Flange I.D. (max)21.25 (539.8)
Flange O.D.27.50 (698.5)
Bolt Circle25.00 (635)
Bolt Hole1.25 (32)
# of Bolts20
# of ClampsNone Required
Bolt Size18 x 3 1/2

30″ ASA

Flange I.D. (max)32.125 (816)
Flange O.D.38.00 (965)
Bolt Circle36.25 (921)
Bolt Hole0.88 (22)
# of Bolts16
# of ClampsNone Required
Bolt Size3/4-10 x 3 1/4

35″ ASA

Flange I.D. (max)35.0 (889)
Flange O.D.41.75 (1060)
Bolt Circle38.50 (978)
Bolt Hole0.88 (22)
# of Bolts28
# of ClampsNone Required
Bolt Size3/4-10 x 3 1/4

Legend

(*) All dimensions are in inches (mm).

(#) Thread size and bolt length are straight through – not tapped.

(+) Clamp clearance hole.

(++) Double claw clamps required.