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ISO Standard Flange Dimensions

K-style ISO Flanges Dimensions

Size Tube
OD
in.
Flange
OD
in. (mm)
Flange
Thick.
in. (mm)
Single Clamps Double
Clamps
No. of
Clamps
Ass’bly
Dia.
in. (mm)
Height
in. (mm)
Thread Height
in. (mm)
Min. Opt.
ISO 160 6 7.09 .472 1.25 5/16-18 2.05 4 8 8.35
  (180) (12) (32) (M10) (52) (212)
ISO 200 8 9.45 .472 1.25 5/16-18 2.05 6 12 10.71
  (240) (12) (32) (M10) (52) (272)
ISO 63 2 1/2 3.74 .472 1.2 5/16-18 1.98 3 4 5.00
  (95) (12) (30) (M8) (50) (127)
ISO 80 3 4.33 .472 1.2 5/16-18 1.98 4 8 5.59
  (110) (12) (30) (M8) (50) (142)
ISO 100 4 5.12 .472 1.2 5/16-18 1.98 4 8 6.38
  (130) (12) (30) (M8) (50) (162)
ISO 250 10 11.42 .472 1.25 5/16-18 2.05 6 12 12.68
  (290) (12) (32) (M10) (52) (322)
ISO 320 12 3/4 14.57 .670 1.57 7/16-14 2.56 8 12 16.73
  (370) (17) (40) (M12) (52) (425)
ISO 400 16 17.72 .670 1.57 7/16-14 2.56 8 16 20.08
  (450) (17) (40) (M12) (52) (510)
ISO 500 20 21.65 .670 1.57 7/16-14 2.56 12 16 24.02
  (550) (17) (40) (M12) (52) (610)
ISO 630 24 27.17 .866 1.77 7/16-14 3.35 14 18 29.53
  (690) (22) (45) (M12) (85)     (750)

F-style ISO Flanges Dimensions

Flanges Holes Bolts
Size OD
in. (mm)
Thick.
in. (mm)
No. Dia.
in. (mm)
BCD
in. (mm)
Dia.
in. (mm)
Wrench
in. (mm)
ISO 63 5.12 .47 4 .35 4.33 5/16 1/2
  (130) (12) (9) (110) (8) (13)
ISO 80 5.71 .47 8 .35 4.92 5/16 1/2
  (145) (12) (9) (125) (8) (13)
ISO 250 13.19 .63 12 .43 12.20 3/8 9/16
  (335) (16) (11) (310) (10) (17)
ISO 320 16.73 .79 12 .55 15.55 1/2 3/4
  (425) (20) (14) (395) (12) (19)
ISO 400 20.08 .79 16 .55 18.90 1/2 3/4
  (510) (20) (14) (480) (12) (19)
ISO 100 6.50 .47 8 .35 5.71 5/16 1/2
  (165) (12) (9) (145) (8) (13)
ISO 160 8.86 .63 8 .43 7.87 3/8 9/16
  (225) (16) (11) (200) (10) (17)
ISO 200 11.22 .63 12 .43 10.24 3/8 9/16
  (285) (16) (11) (260) (10) (17)
ISO 500 24.02 .79 16 .55 22.83 1/2 3/4
  (610) (20) (14) (580) (12) (19)
ISO 630 29.53 .95 20 .55 28.35 1/2 3/4
  (750) (24) (14) (720) (12) (19)
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