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GRUVLOK
g
-1-
-2-
Tubing Outside Diameter
Nominal
Size
Actual
Tolerance
In.
In./mm
+ In./mm
2.125
0.002
2
54.0
0.05
2.625
0.002
2
/
1
2
66.7
0.05
3.125
0.002
3
79.4
0.05
4.125
0.002
4
104.8
0.05
5.125
0.002
5
130.2
0.05
6.125
0.002
6
155.6
0.05
8.125
0.002
8
206.4
0.05
COLUMN 1 - Nominal tubing size ASTM B88
COLUMN 2 - Outside diameter of copper tubing per ASTM B88. Allowable
tolerance from square cut ends is 0.030"/0.76mm for sizes
2"-3"; 0.045"/1.14mm for sizes 4-8"
COLUMN 3 - Gasket seat must be free from scores, roll marks, indentations,
grease and dirt which may interfere with gasket sealing.
COLUMN 4 - Groove width is to be free from chips, dirt, etc. which may
interfere with proper coupling assembly.
SECTION X – GROOVE SPECIFICATIONS
CTS COPPER SYSTEM GROOVE SPECIFICATIONS
®
cts c
s
ruvloK
opper
-3-
Gasket Seat "A"
+/– 0.03 in.
+/– 0.76mm
– In./mm
In./mm
0.002
0.610
0.05
15.5
0.002
0.610
0.05
15.5
0.002
0.610
0.05
15.5
0.002
0.610
0.05
15.5
0.002
0.610
0.05
15.5
0.002
0.610
0.05
15.5
0.004
0.610
0.10
15.5
A
B
C
D
– r
g
ystem
oll
roove
-4-
Groove Diameter "C"
Groove Width "B"
+0.03/–0.00 in.
Actual
+0.76/–0.00mm
In./mm
In./mm
0.300
2.029
7.6
51.54
0.300
2.525
7.6
64.14
0.300
3.025
7.6
76.84
0.300
4.019
7.6
102.08
0.300
4.999
7.6
126.97
0.300
5.999
7.6
152.37
0.300
7.959
7.6
202.16
COLUMN 5 - Groove diameter must be of uniform depth for the entire
circumference of the tubing. (See column 6).
COLUMN 6 - Groove depth is for reference only; the groove diameter
must conform to column 5.
COLUMN 7 - DWV (Drain, Waste and Vent Piping) per ASTM B306.
COLUMN 8 - Maximum flare diameter is the OD at the most extreme
tubing diameter.
T
s
pecifications
-5-
-6-
Nominal Groove
Tolerance
Depth "D"
+0.000
– In./mm
In./mm
-0.020
0.048
-0.51
1.2
-0.020
0.050
-0.51
1.3
-0.020
0.050
-0.51
1.3
-0.020
0.053
-0.51
1.3
-0.020
0.053
-0.51
1.3
-0.020
0.063
-0.51
1.6
-0.020
0.083
-0.51
2.1
1007/3007 RGM-7.09
-7-
-8-
Min.
Max.
Wall
Flare
"T"
Diam.
In./mm
In./mm
0.058
2.220
1.6
56.4
0.065
2.720
1.7
69.1
3.220
DWV
81.8
4.220
DWV
107.2
5.220
DWV
132.6
6.220
DWV
158.0
8.220
DWV
208.8
21
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