Class 1500
Class 2500
Inner
Sealing Element
Outer
Size
Ring
Ring
NPS
Inside (A)
Inside (B) Outside (C) Outside (D)
Diameter
Diameter
Diameter
Diameter
1/2
0.56
0.75
1.25
2.75
3/4
0.81
1.00
1.56
3.00
1
1.06
1.25
1.88
3.38
1-1/4
1.31 (4)
1.56
2.38
4.13
1-1/2
1.63 (4)
1.88
2.75
4.63
2
2.06 (4)
2.31
3.38
5.75
2-1/2
2.50 (4)
2.75
3.88
6.63
3
3.10
3.63
4.75
7.75
4
3.85 (5)
4.63
5.88
9.25
5
4.90 (5)
5.63
7.00
11.00
6
5.80 (5)
6.75
8.25
12.50
8
7.75 (5)
8.50
10.13
15.25
10
9.69 (5)
10.63
12.25
18.75
12
11.50 (5)
12.50
14.50
21.63
Inner
Sealing Element
Outer
Size
Ring
Ring
NPS
Inside (A)
Inside (B) Outside (C) Outside (D)
Diameter
Diameter
Diameter
Diameter
1/2
0.56
0.75
1.25
2.50
3/4
0.81
1.00
1.56
2.75
1
1.06
1.25
1.88
3.13
1-1/4
1.31 (4)
1.56
2.38
3.50
1-1/2
1.63 (4)
1.88
2.75
3.88
2
2.06 (4)
2.31
3.38
5.63
2-1/2
2.50 (4)
2.75
3.88
6.50
3
3.10
3.63
4.75
6.88
3-1/2*
—
4.13
5.25
7.38
4
3.85
4.63
5.88
8.25
4-1/2*
—
5.31
6.50
9.13
5
4.90
5.63
7.00
10.00
6
5.80
6.75
8.25
11.13
8
7.75
8.50
10.13
13.88
10
9.69
10.50
12.25
17.13
12
11.50 (5)
12.75
14.50
20.50
14
12.63 (5)
14.25
15.75
22.75
16
14.50 (5)
16.00
18.00
25.25
18
16.75 (5)
18.25
20.50
27.75
20
18.75 (5)
20.25
22.50
29.75
24
22.75 (5)
24.25
26.75
35.50
* ASME B16.20 does not include dimensions for NPS 1/4, 3-1/2 or
4-1/2, or Class 400 fanges up to NPS 3 and Class 900 fanges up to
NPS 2-1/2.
Dimensions in inches.
WARNING:
Properties/applications shown throughout this brochure are typical. Your specifc applica-
tion should not be undertaken without independent study and evaluation for suitability.
For specifc application recommendations consult Garlock. Failure to select the proper
sealing products could result in property damage and/or serious personal injury.
Performance data published in this brochure has been developed from feld testing,
customer feld reports and/or in-house testing.
While the utmost care has been used in compiling this brochure, we assume no respon-
sibility for errors. Specifcations subject to change without notice. This edition cancels
all previous issues. Subject to change without notice.
Styles RW, RWI Dimensions
1/4" to 24" Flanges
ASME B16.20 Gaskets for
ASME B16.5 Flanges
D-25
Notes:
1. Inner rings are required for all PTFE gaskets and for Class 900
gaskets, NPS 24; Class 1500 gaskets, NPS 12 through NPS 24;
and Class 2500 gaskets, NPS 4 through NPS 12 (see ASME B16.20
code, 3.2.5).
2. The gasket outside diameter tolerance for NPS 1/2 through NPS 8 is
±0.03"; for NPS 10 through NPS 24, +0.06", –0.03".
3. The gasket inside diameter tolerance for NPS 1/2 through NPS 8 is
±0.016"; for NPS 10 through NPS 24, ±0.03".
4. The centering ring outside diameter tolerance is ±0.03".
5. There are no Class 400 fanges in NPS 1/2 through NPS 3 (use Class
600), Class 900 fanges in NPS 1/2 through NPS 2-1/2 (use Class
1500), or Class 2500 fanges NPS 14 and larger.