Flanges
Ring Joint Facings - ASME/ANSI B16.5 & B16.47
Ring joint facing dimensions - ASME/ANSI B16.5
and B16.47 Series A (MSS SP-44) and Series B (API 605)
Class (lb)
Groove/Ring
Number
Raised
Face Groove
150 300 400 600 900 1500 2500
Nominal Pipe Size (NPS)
Face
Diameter
min
Pitch
Diameter Depth1 Width
Radius
at
Bottom
in
mm
in
mm
in
mm
in
mm
in
mm
ASME/ANSI B16.5 covers NPS 1/2 to 24:
1/2
Use Class 600 for sizes < 31/2
1/2
Use Class 1500 for sizes < 21/2
R11 2.000
50.80
1.344
34.14
0.219
5.56
0.281
7.14
0.03
0.76
1/2 R12 2.380
60.45
1.562
39.67
0.250
6.35
0.344
8.74
0.03
0.76
3/4 3/4 R13 2.500
63.50
1.688
42.88
0.250
6.35
0.344
8.74
0.03
0.76
1/2 R13 2.560
65.02
1.688
42.88
0.250
6.35
0.344
8.74
0.03
0.76
3/4 R14 2.620
66.55
1.750
44.45
0.250
6.35
0.344
8.74
0.03
0.76
1 R15 2.500
63.50
1.875
47.63
0.250
6.35
0.344
8.74
0.03
0.76
1 1 R16 2.750
69.85
2.000
50.80
0.250
6.35
0.344
8.74
0.03
0.76
1 R16 2.810
71.37
2.000
50.80
0.250
6.35
0.344
8.74
0.03
0.76
3/4 R16 2.880
73.15
2.000
50.80
0.250
6.35
0.344
8.74
0.03
0.76
11/4 R17 2.880
73.15
2.250
57.15
0.250
6.35
0.344
8.74
0.03
0.76
11/4 11/4 R18 3.120
79.25
2.375
60.33
0.250
6.35
0.344
8.74
0.03
0.76
11/4 R18 3.190
81.03
2.375
60.33
0.250
6.35
0.344
8.74
0.03
0.76
1 R18 3.250
82.55
2.375
60.33
0.250
6.35
0.344
8.74
0.03
0.76
11/2 R19 3.250
82.55
2.562
65.07
0.250
6.35
0.344
8.74
0.03
0.76
11/2 11/2 R20 3.560
90.42
2.688
68.28
0.250
6.35
0.344
8.74
0.03
0.76
11/2 R20 3.620
91.95
2.688
68.28
0.250
6.35
0.344
8.74
0.03
0.76
11/4 R21 4.000
101.60
2.844
72.24
0.312
7.92
0.469
11.91
0.03
0.76
2 R22 4.000
101.60
3.250
82.55
0.250
6.35
0.344
8.74
0.03
0.76
2 2 R23 4.250
107.95
3.250
82.55
0.312
7.92
0.469
11.91
0.03
0.76
11/2 R23 4.500
114.30
3.250
82.55
0.312
7.92
0.469
11.91
0.03
0.76
2 R24 4.880
123.95
3.750
95.25
0.312
7.92
0.469
11.91
0.03
0.76
21/2 R25 4.750
120.65
4.000
101.60
0.250
6.35
0.344
8.74
0.03
0.76
21/2 21/2 R26 5.000
127.00
4.000
101.60
0.312
7.92
0.469
11.91
0.03
0.76
2 R26 5.250
133.35
4.000
101.60
0.312
7.92
0.469
11.91
0.03
0.76
Note
- Values for minimum flange thickness,
C, and overall length, D, are detailed in
the flange tables.
- For ring joint tolerances see page 8-9.
Flanges
