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Parker Hannifin Corporation
Parflex Division
Ravenna, Ohio
Coiled Air Hose,
Fittings
& Accessories
Hydraulic &
Pneumatic
Hose & Fit.
PTFE
Hose &
Fittings
The
rmoplastic
Tu
bing
Truck (Fleet)
Products
Tooling &
Equipment
Hose
Accessories
Technical &
Design
Information
Approvals &
Guides
Alphanumeric
Index
51 Series Field Attachable
20651 SAE (JIC) 37° Swivel
20851 SAE 45° Swivel
A
37°
45°
W H J
B
A
J
H
45°
B
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, J
Hex
W
Hex
Hose Fitting
inch
inch inch mm inch mm inch
inch
20651-4-3
+
+
7/16-20
1/4
3/16
1.99 51 1.25 32
9/16
5/8
20651-4-4
+
+
7/16-20
1/4
1/4
2.18 55 1.25 32
9/16
5/8
20651-5-4
+
+
1/2-20
5/16
1/4
2.24 57 1.44 37
5/8
5/8
20651-6-4
+
+
9/16-18
3/8
1/4
2.34 59 1.44 37 11/16
5/8
20651-6-5
+
+
9/16-18
3/8
5/16
2.37 60 1.50 38 11/16
3/4
20651-6-6
+
9/16-18
3/8
3/8
2.74 70 1.44 37 11/16
7/8
20651A-6-6
+
+
9/16-18
3/8
3/8
2.74 70 1.44 37 11/16
7/8
20651-8-6
+
+
3/4-16
1/2
3/8
2.88 73 1.63 41
7/8
7/8
20651-8-8
+
+
3/4-16
1/2
1/2
3.25 83 1.75 44
7/8
1-1/16
20651A-8-8
+
+
3/4-16
1/2
1/2
3.25 83 1.75 44
7/8
1-1/16
20651-10-8
+
+
7/8-14
5/8
1/2
3.37 86 1.88 48
1
1-1/16
20651-12-12
+
+
1-1/16-12
3/4
3/4
3.75 95 2.13 54 1-1/4
1-3/8
20651-16-16
+
+
1-5/16-12
1
1
3.93 100 2.44 62 1-1/2 1-11/16
Steel
Part
Number
B C
Thread
Size
Tube
O. D.
Hose
I.D.
A
Cutoff
Allow.
B
H, J
Hex
W
Hex
Hose Fitting
inch
inch
inch mm inch mm inch
inch
20851-6-6
+
+
5/8-18
3/8
3/8
2.82 72 1.56 40
3/4
7/8
(+) 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.