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50
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
51 Series Metric Field Attachable
21D51 Standpipe Light Series
A
W H
C
B
51 Series Field Attachable
Steel
Part
Number
Tube
O.D.
Hose
I.D.
A
Cutoff
Allow.
B
C
H
Hex
W
Hex
Hose Fitting
mm inch
inch mm inch mm inch mm mm mm
21D51-6-3
6
3/16
2.17 55 1.38 35 0.87 22
17
16
21D51-6-6 (+)
6
3/8
2.64 67 1.26 32 0.71 18
19
22
21D51-8-4 (+)
8
1/4
2.28 58 1.42 36 0.87 22
14
17
21D51-10-5
10
5/16
2.52 64 1.50 38 0.91 23
14
29
21D51-10-6 (+)
10
3/8
2.80 71 1.65 42 0.91 23
17
22
21D51-15-8
15
1/2
3.15 80 1.89 48 0.98 25
19
27
21D51-22-12 (+)
22
3/4
3.46 88 1.89 48 1.10 28
27
35
21D51-28-16 (+)
28
1
4.09 104 2.28 58 1.18 30
32
43
(+) Non Standard. See page ii for information on non-standard products.
23D51 Standpipe Heavy Series
A
W H
C
B
51 Series Field Attachable
Steel
Part
Number
Tube
O.D.
Hose
I.D.
A
Cutoff
Allow.
B
C
H
Hex
W
Hex
Hose Fitting
mm inch
inch mm inch mm inch mm mm mm
23D51-8-3 (+)
8 (+)
3/16
2.20 56 1.42 36 0.94 24
14
16
23D51-10-4 (+)
10 (+)
1/4
2.28 58 1.42 36 1.02 26
14
17
23D51-12-5 (+)
12 (+)
5/16
2.56 65 1.54 39 1.02 26
14
29
23D51-12-6 (+)
12
3/8
2.91 74 1.81 46 1.02 26
17
22
23D51-14-6 (+)
14
3/8
3.03 77 1.89 48 1.14 29
17
22
23D51-25-12 (+)
25
3/4
4.17 106 2.56 65 1.58 40
27
35
23D51-30-16 (+)
30
1
4.65 118 2.83 72 1.73 44
32
43
* 51 series field attachable couplings are not intended for use on hose that has previously been in service.