B
2
: Flange thickness without gasket surface
F=B
1
-B
2
: Gasket surface thickness
G: Gasket surface diameter
# Bolts: Number of bolts
K: Bolt hole circle diameter
Dimensions are in inches (millimeters).
Note
Dimensions may be used to aid in the identification of installed flanges. It is not intended
for manufacturing use.
Table A-24: Dimensions of Proprietary Flanges
Special flanges
(1)
D B
1
B
2
F G # Bolts K
Fisher
™
249B/
259B
(2)
9.00 (228.6) 1.50 (38.2) 1.25 (31.8) 0.25 (6.4) 5.23 (132.8) 8 7.25 (184.2)
Fisher 249C
(3)
5.69 (144.5) 0.94 (23.8) 1.13 (28.6) -0.19 (-4.8) 3.37 (85.7) 8 4.75
(120.65)
Masoneilan
™
(2)
7.51(191.0) 1.54 (39.0) 1.30 (33.0) 0.24 (6.0) 4.02 (102.0) 8 5.87 (149.0)
(1) These flanges are also available in a vented version. Vented flanges must be ordered with a 1½-in. NPT threaded
process connection (code RA).
(2) Flange with raised face.
(3) Flange with recessed face.
For information about flange temperature and pressure ratings, see Fisher and Masoneilan
flange rating.
A.6 Flushing connection rings
Figure A-39: Flushing Connection Rings
A. Height: 0.97 in. (24.6 mm)
Table A-25: Pressure and Temperature Rating for Flushing Ring up to Class 2500
Flushing connection
rings
D
i
D
o
D
H
2 in. ANSI 2.12 (53.8) 3.62 (91.9) ¼ in. NPT
3 in. ANSI 3.60 (91.4) 5.00 (127.0) ¼ in. NPT
4 in. ANSI/DN100 3.60 (91.4) 6.20 (157.5) ¼ in. NPT
Reference Manual Specifications and reference data
00809-0100-4530 April 2019
Reference Manual 325
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