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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 Circle 1.063 (27)
Bolt Hole 0.169 (4.3)
# of Bolts 6
# of Clamps None Required
Bolt Size 832 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 Circle 1.625 (41.3)
Bolt Hole 0.265 (6.7)
# of Bolts 4
# of Clamps None Required
Bolt Size 1/4-28 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 Circle 2.312 (58.7)
Bolt Hole 0.265 (6.7)
# of Bolts 6
# of Clamps None Required
Bolt Size 1/4-28 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 Circle 3.628 (92.2)
Bolt Hole 0.332 (8.4)
# of Bolts 8
# of Clamps None Required
Bolt Size 5/16-24 x 2 (#)

NW 75 CF/4 5/8″

Flange I.D. (max) 2.88 (73)
Flange O.D. 4.62 (117.35)
Bolt Circle 4.030 (102.4)
Bolt Hole 0.332 (8.4)
# of Bolts 10
# of Clamps None Required
Bolt Size 5/16-24 x 2 (#)

NW 100 CF/6″

Flange I.D. (max) 4.00 (101.6)
Flange O.D. 5.97 (151.6)
Bolt Circle 5.128 (130.3)
Bolt Hole 0.332 (8.4)
# of Bolts 16
# of Clamps None Required
Bolt Size 5/16-24 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 Circle 5.969 (151.6)
Bolt Hole 0.332 (8.4)
# of Bolts 18
# of Clamps None Required
Bolt Size 5/16-24 x 2 1/4 (#)

NW 150 CF/8″

Flange I.D. (max) 6.00 (152.4)
Flange O.D. 7.97 (202.4)
Bolt Circle 7.128 (181.1)
Bolt Hole 0.332 (8.4)
# of Bolts 20
# of Clamps None Required
Bolt Size 5/16-24 x 2 1/4 (#)

NW 200 CF/10″

Flange I.D. (max) 8.00 (203.2)
Flange O.D. 9.97 (253.2)
Bolt Circle 9.128 (231.9)
Bolt Hole 0.332 (8.4)
# of Bolts 24
# of Clamps None Required
Bolt Size 5/16-24 x 2 1/2 (#)

NW 250 CF/12″

Flange I.D. (max) 9.843 (250.0)
Flange O.D. 12.05 (306)
Bolt Circle 11.18 (284)
Bolt Hole 0.332 (8.4)
# of Bolts 32
# of Clamps None Required
Bolt Size 5/16-24 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 Circle 12.06 (306.3)
Bolt Hole 0.390 (9.9)
# of Bolts 30
# of Clamps None Required
Bolt Size 3/8-24 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 Hole 0.35 (8.9) (+)
# of Bolts 4
# of Clamps 4 (++)
Bolt Size M8 x 40

NW 80 ISO-F

Flange I.D. (max) 2.87 (72.90)
Flange O.D. 4.33 (110)
Bolt Circle
Bolt Hole 0.35 (8.9) (+)
# of Bolts 4
# of Clamps 4 (++)
Bolt Size M8 x 40

NW 100 ISO-F

Flange I.D. (max) 3.83 (97.28)
Flange O.D. 5.12 (130)
Bolt Circle
Bolt Hole 0.35 (8.9) (+)
# of Bolts 4
# of Clamps 4 (++)
Bolt Size M8 x 40

NW 160 ISO-F

Flange I.D. (max) 5.87 (149.10)
Flange O.D. 7.09 (180)
Bolt Circle
Bolt Hole 0.43 (10.9) (+)
# of Bolts 4
# of Clamps 4 (++)
Bolt Size M10 x 50

NW 200 ISO-F

Flange I.D. (max) 7.83 (198.90)
Flange O.D. 9.45 (240)
Bolt Circle
Bolt Hole 0.43 (10.9) (+)
# of Bolts 6
# of Clamps 6 (++)
Bolt Size M10 x 50

NW 250 ISO-F

Flange I.D. (max) 12.42 (315.47)
Flange O.D. 14.57 (370)
Bolt Circle
Bolt Hole 0.43 (10.9) (+)
# of Bolts 6
# of Clamps 6 (++)
Bolt Size M10 x 50

NW 320 ISO-F

Flange I.D. (max) 12.42 (315.47)
Flange O.D. 14.57 (370)
Bolt Circle
Bolt Hole 0.51 (13.0) (+)
# of Bolts 8
# of Clamps 8 (++)
Bolt Size M12 x 60

NW 400 ISO-F

Flange I.D. (max) 15.50 (393.70)
Flange O.D. 17.72 (450)
Bolt Circle
Bolt Hole 0.51 (13.0) (+)
# of Bolts 8
# of Clamps 8 (++)
Bolt Size M12 x 60

NW 500 ISO-F

Flange I.D. (max) 19.50 (495.30)
Flange O.D. 21.65 (550)
Bolt Circle
Bolt Hole 0.51 (13.0) (+)
# of Bolts 12
# of Clamps 12 (++)
Bolt Size M12 x 60

NW 63 ISO-Bolt Flange

Flange I.D. (max) 2.37 (60.20)
Flange O.D. 5.12 (130)
Bolt Circle 4.331 (110)
Bolt Hole M8
# of Bolts 4
# of Clamps 4
Bolt Size M8 x 40

NW 80 ISO-Bolt Flange

Flange I.D. (max) 2.87 (72.90)
Flange O.D. 5.71 (145)
Bolt Circle 4.920 (125)
Bolt Hole M8
# of Bolts 4
# of Clamps 4
Bolt Size M8 x 40

NW 100 ISO-Bolt Flange

Flange I.D. (max) 3.83 (97.28)
Flange O.D. 6.496 (165)
Bolt Circle 5.709 (145)
Bolt Hole M8
# of Bolts 8
# of Clamps 4
Bolt Size M8 x 40

NW 160 ISO-Bolt Flange

Flange I.D. (max) 5.87 (149.10)
Flange O.D. 8.858 (225)
Bolt Circle 7.874 (200)
Bolt Hole M10
# of Bolts 8
# of Clamps 4
Bolt Size M10 x 50

NW 200 ISO-Bolt Flange

Flange I.D. (max) 7.83 (198.90)
Flange O.D. 11.22 (285)
Bolt Circle 10.236 (260)
Bolt Hole M10
# of Bolts 12
# of Clamps 6
Bolt Size M10 x 50

NW 250 ISO-Bolt Flange

Flange I.D. (max) 9.75 (247.65)
Flange O.D. 13.189 (335)
Bolt Circle 12.205 (310)
Bolt Hole M10
# of Bolts 12
# of Clamps 6
Bolt Size M10 x 50

NW 320 ISO-Bolt Flange

Flange I.D. (max) 12.42 (315.47)
Flange O.D. 16.732 (425)
Bolt Circle 15.551 (395)
Bolt Hole M12
# of Bolts 12
# of Clamps 8
Bolt Size M12 x 60

NW 400 ISO-Bolt Flange

Flange I.D. (max) 15.50 (393.70)
Flange O.D. 20.08 (510)
Bolt Circle 18.90 (480)
Bolt Hole M12
# of Bolts 16
# of Clamps 8
Bolt Size M12 x 60

NW 500 ISO-Bolt Flange

Flange I.D. (max) 19.50 (495.30)
Flange O.D. 24.02 (610)
Bolt Circle 22.83 (580)
Bolt Hole M12
# of Bolts 16
# of Clamps 12
Bolt Size M12 x 60

1.5″ ASA

Flange I.D. (max) 2.200 (55.9)
Flange O.D. 5.00 (127.0)
Bolt Circle 3.875 (98.4)
Bolt Hole 0.62 (15.9)
# of Bolts 4
# of Clamps None Required
Bolt Size 1/2-13 x 1 1/2

2″ ASA

Flange I.D. (max) 3.00 (76.2)
Flange O.D. 6.00 (152.6)
Bolt Circle 4.750 (120.7)
Bolt Hole 0.75 (19.1)
# of Bolts 4
# of Clamps None Required
Bolt Size 5/8-11 x 1 3/4

3″ ASA

Flange I.D. (max) 4.20 (107)
Flange O.D. 7.50 (190.5)
Bolt Circle 6.00 (152.4)
Bolt Hole 0.75 (19.1)
# of Bolts 8
# of Clamps None Required
Bolt Size 5/8-11 x 1 3/4

4″ ASA

Flange I.D. (max) 5.70 (145)
Flange O.D. 9.00 (228.6)
Bolt Circle 7.500 (190.5)
Bolt Hole 0.75 (19.1)
# of Bolts 8
# of Clamps None Required
Bolt Size 5/8-11 x 1 3/4

6″ ASA

Flange I.D. (max) 7.6 (193)
Flange O.D. 11.0 (279.4)
Bolt Circle 9.500 (241.3)
Bolt Hole 0.81 (20.6)
# of Bolts 8
# of Clamps None Required
Bolt Size 3/4-10 x 2 1/4

8″ ASA

Flange I.D. (max) 10.276 (261.0)
Flange O.D. 13.50 (342.9)
Bolt Circle 11.750 (298.5)
Bolt Hole 0.81 (20.6)
# of Bolts 8
# of Clamps None Required
Bolt Size 3/4-10 x 2 1/4

10″ ASA

Flange I.D. (max) 12.00 (304.8)
Flange O.D. 16.00 (406.4)
Bolt Circle 14.250 (362)
Bolt Hole 0.81 (20.6)
# of Bolts 12
# of Clamps None Required
Bolt Size 3/4-10 x 2 1/4

16″ ASA

Flange I.D. (max) 18.00 (457.2)
Flange O.D. 23.50 (596.9)
Bolt Circle 21.25 (539.5)
Bolt Hole 1.12 (28)
# of Bolts 16
# of Clamps None Required
Bolt Size 7/8-9 x 3

20″ ASA

Flange I.D. (max) 21.25 (539.8)
Flange O.D. 27.50 (698.5)
Bolt Circle 25.00 (635)
Bolt Hole 1.25 (32)
# of Bolts 20
# of Clamps None Required
Bolt Size 18 x 3 1/2

30″ ASA

Flange I.D. (max) 32.125 (816)
Flange O.D. 38.00 (965)
Bolt Circle 36.25 (921)
Bolt Hole 0.88 (22)
# of Bolts 16
# of Clamps None Required
Bolt Size 3/4-10 x 3 1/4

35″ ASA

Flange I.D. (max) 35.0 (889)
Flange O.D. 41.75 (1060)
Bolt Circle 38.50 (978)
Bolt Hole 0.88 (22)
# of Bolts 28
# of Clamps None Required
Bolt Size 3/4-10 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.