
3
Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26
Hydraulic Tube Bender
When using radius blocks 631057-112, 631060-128,
974330 and 974350, first install the radius block
adapter plate over the king pin, and then mount the
radius block upon it, as shown above.
Close bend radius blocks
— These blocks have a
threaded pin which threads directly into both Triple-Lok
and Ferulok (Seal-Lok requires an adapter) tube fitting
nuts, permitting a first bend very close to the end of the
tube.
Inch Radius Block Chart
Size
Tube O.D.
AND10111 Standard
MS33611 Standard
Radius Block – Close Bend**
Part
No.
Radius*
Part
No.
Radius*
Part
No.
Radius*
in.
mm
in.
mm
in.
mm
in.
mm
6
3/8
9.5
540502
1-1/4
31.8
590512-18
1-1/8
28.6
—
—
—
8
1/2
12.7
530763
1-1/4
31.8
590515-24
1-1/2
37.5
530597
1-1/4
31.8
10
5/8
15.9
530764
1-1/2
37.5
590518-30
1-7/8
47.6
530601
1-1/2
38.1
12
3/4
19.0
530765
1-3/4
43.8
590521-36
2-1/4
57.2
530605
1-3/4
44.5
14
7/8
22.2
530766
2
50.2
590523-42
2-5/8
66.7
530609
2
50.8
16
1
25.4
—
—
—
590524-48
3
76.2
530613
3
76.2
18
1-1/8
28.6
530768
3-1/2
88.9
590526-54
3-3/8
85.7
530617
3-1/2
88.9
20
1-1/4
31.8
—
—
—
590527-60
3-3/4
95.3
530621
3-3/4
95.2
24
1-1/2
38.2
530770
5
127.0
590530-72
4-1/2
114.3
530625
5
127.0
28
1-3/4
44.5
—
—
—
631057-112
7
177.8
—
—
—
32
2
50.8
—
—
—
631060-128
8
203.2
—
—
—
*Radius to tube centerline.
**Note: Sizes 20 and 24 close bend radius blocks requires the removal of the clamp arm before installation.
Metric Radius Block Chart
Tube
O.D.
(mm)
Standard Radius Blocks
Close Bend Radius Blocks***
Part
No.
Radius
(mm)
Part
No.
Radius
(mm)
10
810023
32
—
—
12
780175
32
780185
32
14
780176
38
780186
38
15
780177
38
780187
38
16
780178
38
780188
38
18
780179
44
780189
44
20
780180
44
780190
44
22
780181
89
—
—
25
780182
100
—
—
30
780183
128
—
—
32
780184
128
—
—
35
974344
105
—
—
38
530770
127
530625
127
38
590530-72
114.3
—
—
42
974347
128
—
—
50
974350
150
—
—
***Note: Size 38mm close bend radius blocks requires removal of the clamp
arm before installation.
Accessories for Close Bend
Radius Blocks
Tube O.D.
(in.)
Threaded Pin
Part No.
Seal-Lok Adapter
Part No.
1/2
930420-8
930421-8
5/8
930420-10
930421-10
3/4
930420-12
930421-12
1
930420-16
930421-16
1-1/4
930420-20
930421-20
1-1/2
930420-24
930421-24
Threaded Pins and Seal-Lok Adapters for Close Bend
Radius Blocks
Inch Pipe Size Radius Block Chart
Nominal
Pipe Size
(in.)
O.D.
(in.)
Part
No.
Bend
Radius
(in.)
Max.
Pipe
Schedule
3/8
0.675
974325
2-1/4
80
1/2
0.840
974326
2-5/8
160
3/4
1.050
974327
3-1/4
80
1
1.315
974328
4
80
1-1/4
1.660
974329
5
80
1-1/2
1.900
974330
6
40
Radius Blocks