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Parker Hannifin Corporation
Parflex Division
Ravenna, Ohio
Hydraulic &
Pneumatic
Hose & Fit.
PTFE
Hose &
Fittings
Thermoplastic
Tubing
Coiled Air Hose,
Fittings
& Accessories
Truck (Fleet)
Products
Tooling &
Equipment
Hose
Accessories
Technical &
Design
Information
Approvals &
Guides
Alphanumeric
Index
20151 Male Taper Pipe Rigid
51 Series Field Attachable
20351 Male (JIC) 37°
A
H
W
B
A
B
H
W
51 Series Field Attachable
51 Series Field Attachable
Steel
Part
Number
B C
Thread
Size
Tube
O. D.
Hose
I.D.
A
Cutoff
Allow.
B
H
Hex
W
Hex
Hose Fitting
inch
inch inch mm inch mm inch
inch
20351-4-3
+
+
7/16-20
1/4
3/16
1.88 48 1.13 29
1/2
5/8
20351-5-4
+
+
1/2-20
5/16
1/4
2.06 52 1.13 29 9/16
5/8
20351-6-5
+
+
9/16-18
3/8
5/16
2.16 55 1.31 33
5/8
3/4
20351-6-6
+
+
9/16-18
3/8
3/8
2.61 66 1.44 37
3/4
7/8
20351-8-6
+
+
3/4--16
1/2
3/8
2.71 69 1.44 37 13/16
7/8
20351-8-8
+
+
3/4-16
1/2
1/2
3.08 78 1.63 41
7/8
7/8
Steel
Part
Number B C
NPTF Pipe
Thread
Hose
I.D.
A
Cutoff
Allow.
B
H
Hex
W
Hex
Hose Fitting
inch
inch mm inch mm inch
inch
20151-2-3
+
+
1/8-27
3/16
1.71 43
1
25
7/16
5/8
20151-4-3
+
+
1/4-18
3/16
1.90 48 1.13
29
9/16
5/8
20151-2-4
+
+
1/8-27
1/4
1.90 48
1
25
1/2
5/8
20151-4-4
+
+
1/4-18
1/4
2.08 53 1.19
30
9/16
5/8
20151-4-5
+
+
1/4-18
5/16
2.17 55 1.44
37
9/16
3/4
20151-6-5
+
+
3/8-18
5/16
2.17 55 1.44
37
3/4
3/4
20151-4-6
+
+
1/4-18
3/8
2.61 66 1.44
37
3/4
7/8
20151-6-6
+
3/8-18
3/8
2.61 66 1.44
37
3/4
7/8
20151-8-6
+
+
1/2-14
3/8
2.80 71 1.56
40
7/8
7/8
20151-6-8
+
+
3/8-18
1/2
2.99 76 1.50
38
7/8
1-1/16
20151-8-8
+
+
1/2-14
1/2
3.17 81 1.69
43
7/8
1-1/16
20151-12-12
+
+
3/4-14
3/4
3.42 87 1.75
44 1-1/8
1-3/8
20151-16-16
+
+
1-11-1/2
1
3.74 95 2.25
57 1-3/8 1-11/16
(+) Non Standard. See page ii for information on non-standard products.
* 51 series field attachable couplings are not intended for use on hose that has previously been in service.