Technical Info

Flanges Dimension and Sizes

FLANGE
NPS
Outside
Diameter
Bolt Circle (BC) Raised Face (R) Raised Face (RF) Raised Face
Thickness (T)
Flat Face
Thickness (T2)
Bolt Hole (B) No. of
Bolt Holes
1/2″ 3.50″ 2.38″ 1.38″ .063″ .44″ .38″ .62″ 4
3/4″ 3.88″ 2.75″ 1.69″ .063″ .50″ .44″ .62″ 4
1″ 4.25″ 3.12″ 2.00″ .063″ .56″ .50″ .62″ 4
1-1/4″ 4.62″ 3.50″ 2.50″ .063″ .62″ .56″ .62″ 4
1-1/2″ 5.00″ 3.88″ 2.88″ .063″ .68″ .62″ .62″ 4
2″ 6.00″ 4.75″ 3.62″ .063″ .75″ .69″ .75″ 4
2-1/2″ 7.00″ 5.50″ 4.12″ .063″ .88″ .82″ .75″ 4
3″ 7.50″ 6.00″ 5.00″ .063″ .94″ .88″ .75″ 4
3-1/2″ 8.50″ 7.00″ 5.50″ .063″ .94″ .88″ .75″ 8
4″ 9.00″ 7.50″ 6.19″ .063″ .94″ .88″ .75″ 8
5″ 10.00″ 8.50″ 7.31″ .063″ .94″ .88″ .88″ 8
6″ 11.00″ 9.50″ 8.50″ .063″ 1.00″ .94″ .88″ 8
8″ 13.50″ 11.75″ 10.62″ .063″ 1.12″ 1.06″ .88″ 8
10″ 16.00″ 14.25″ 12.75″ .063″ 1.19″ 1.13″ 1.00″ 12
12″ 19.00″ 17.00″ 15.00″ .063″ 1.25″ 1.19″ 1.00″ 12
14″ 21.00″ 18.75″ 16.25″ .063″ 1.38″ 1.32″ 1.12″ 12
16″ 23.50″ 21.25″ 18.50″ .063″ 1.44″ 1.38″ 1.12″ 16
18″ 25.00″ 22.75″ 21.00″ .063″ 1.56″ 1.50″ 1.25″ 16
20″ 27.50″ 25.00″ 23.00″ .063″ 1.69″ 1.63″ 1.25″ 20
22″ 29.50″ 27.25″ 25.25″ .063″ 1.81″ 1.75″ 1.38″ 20
24″ 32.00″ 29.50″ 27.25″ .063″ 1.88″ 1.82″ 1.38″ 20

Stainless Steel Flanges Dimension Chart PDF

Nominal
Pipe
Size
"A"
(O.D.)
"B"
(Thk.)
"C"
(RF Dia.)
"D"
(B.C.D.)
# Bolt
Holes
Dia. of
Bolt Holes
Approx.
Weight
 1/2" 3-3/4 9/16 1-3/8 2-5/8 4 5/8 2
 3/4" 4-5/8 5/8 1-11/16 3-1/4 4 3/4 3
 1" 4-7/8 11/16 2 3-1/2 4 3/4 4
 1-1/4" 5-1/4 3/4 2-1/2 3-7/8 4 3/4 6
 1-1/2" 6-1/8 13/16 2-7/8 4-1/2 4 7/8 7
 2" 6-1/2 7/8 3-5/8 5 8 3/4 8
 2-1/2" 7-1/2 1 4-1/8 5-7/8 8 7/8 12
 3" 8-1/4 1-1/8 5 6-5/8 8 7/8 16
 3-1/2" 9 1-3/16 5-1/2 7-1/4 8 7/8 21
 4" 10 1-1/4 6-3/16 7-7/8 8 7/8 28
 5" 11 1-3/8 7-5/16 9-1/4 8 7/8 37
 6" 12-1/2 1-7/16 8-1/2 10-5/8 12 7/8 48
 8" 15 1-5/8 10-5/8 13 12 1 79
 10" 17-1/2 1-7/8 12-3/4 15-1/4 16 1-1/8 122
 12" 20-1/2 2 15 17-3/4 16 1-1/4 183
 14" 23 2-1/8 16-1/4 20-1/4 20 1-1/4 241
 16" 25-1/2 2-1/4 18-1/2 22-1/2 20 1-3/8 315
 18" 28 2-3/8 21 24-3/4 24 1-3/8 414
 20" 30-1/2 2-1/2 23 27 24 1-3/8 515
 24" 36 2-3/4 27-1/4 32 24 1-5/8 800
1/16" raised face included in flange thickness.
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