ROD END BEARINGS & LINKAGES
4
Fax: +44 (0)1992 509890
25
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ROD ENDS & SPHERICAL BEARINGS
Unibal rod ends and spherical bearings are available in a variety
of types and a full range of sizes. Following is a summary of
types available.
selection
To ensure optimum life and reliability it is clearly important to
select a rod end or spherical bearing suited to the application.
The technical information which follows is provided as a guide
to selection only, although it will be adequate for simple
applications involving low loads, speeds, frequencies etc. For
more demanding applications please contact our technical
sales staff who will always be pleased to assist. Given sufficient
information we can readily advise which Unibal product will be
best suited to the application, and we can also provide an
indication of the life expectancy.
A comprehensive Unibal catalogue containing full technical
details is available on request.
The product information contained in this catalogue relates to
components in standard production. In addition to these
standard types, Schaublin are able to manufacture special
versions to suit customers’ requirements, and enquiries for such
are welcome.
• Standard
• Chromed ball
• Stainless Steel
• High Strength
• High Performance
4
• UNIFLON lined - self lubricating
This range of high quality components is manufactured by
Schaublin SA in Switzerland, a company long associated with
precision engineering, and for 35 years the design,
development and manufacture of Unibal rod ends and spherical
bearings. The Unibal trade mark has become synonymous with
the best in quality and reliability, a reputation which derives
from sound technical support based on extensive testing, close
involvement with customers and the monitoring of quality at
each stage of manufacture.
These are basic descriptions only. For further details of
characteristics and selection please refer to the tables on
pages 27 and 28.
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Tel: +44 (0)1992 509888
P R O D U C T S U M M A RY
Table 1
SERIES
Standard Series
ROD
ENDS
*
*
Series 10
*
*
*
Series 20
*
*
*
*
*
*
*
Series 50/51/52
*
SPHERICALS
TYPE
REFERENCE
SMG, SFG
SS
SMG.10
SFG.10
SS.10
SMG.20
SFG.20
SMG.40
SFG.40
SMG.45
SFG.45
SS.45
SMGM.50
/51/52
CHARACTERISTICS
Simple mechanical applications with no
special demands.
As standard but with chrome plated ball for
reduced wear, corrosion resistance and higher
operating speeds.
As standard but offering a range of alternative
threads including CETOP.
High tensile steel housing to withstand high
static loads.
Stainless steel housing and ball for use in
corrosive environments
BEARING
SURFACES
Steel / Bronze
TABLE 2
REFERENCE
1
Steel / Bronze
2
Steel / Bronze
3
4
Series 40
Steel / Bronze
4
Series 45
Steel / Bronze
5
High performance series, for high resistance to
static loads and vibration. Not suitable for high
speeds.
High performance series with UNIFLON®E
lining. Self lubricating.
UNIFLON®VV lining with polished ball for high
operating speeds (8M/min). Self lubricating.
UNIFLON®E lining with polished ball. Rated higher
for loads and speeds (6m/min). Self lubricating.
High tensile steel, UNIFLON®E lined for high
static & high dynamic loads. Self lubricating.
Stainless steel, UNIFLON®E lined for higher
loads/speeds in corrosive environments.
Steel / Steel
6
Series 50/51/52
+ UNIFLON®E
UNIFLON®VV
*
SMEM.50
/51/52
SMVV, SFVV
SSVV
SME, SFE
SSE
SME.40
SFE.40
SME.45
SFE.45
SSE.45
SSA
Steel / UNIFLON®E
7
*
*
Steel / UNIFLON®VV
8
UNIFLON®E
*
*
Steel / UNIFLON®E
9
Series 40
+ UNIFLON®E
Series 45
+UNIFLON®E
*
*
*
*
*
Steel / UNIFLON®E
10
St.steel / UNIFLON®E
11
Steel Spherical
*
Standard steel/steel bearings; good resistance
to shockloads, static loads, vibrations.
As SSA but with chrome ball for reduced wear,
corrosion resistance and higher operating
speeds.
Stainless steel bearing with good resistance to
static loads.
High performance series, no play for high
resistance to static loads and improved
dynamic performance.
High strength, no play, UNIFLON®E lined for
exceptional load resistance and high speeds
(9m/min). Self lubricating.
Steel / Steel
12
Steel Spherical
Series 10
*
SSA.10
Steel / Steel
13
St. Steel Spherical
Series 45
Steel Spherical
Series 50
*
SSA.45
St.steel / St.steel
14
*
SSA.50
Steel / Steel
15
Steel Spherical
Series 50
+ UNIFLON®E
*
SSE.50
Steel / UNIFLON®E
16
Fax: +44 (0)1992 509890
27
®
SELECTION
Table 2 compares various types of rod
end and spherical bearings under different
operating conditions, and will enable an
initial selection to be made. Size and load
considerations should then be checked
by reference to the product tables on the
following pages.
The suitability and life expectancy of the
chosen component can be checked by
calculation if required; please contact the
Huco sales office for assistance.
Frequent lubrication
Constant dynamic
load
Alternating and/or
pulsatory load
Table 1 Reference
Neoprene rubber
seals sizes 6 – 22
Axial loads
Axial shock loads
No lubrication
no maintenance
High operating
speed
Temperature
100 – 250ºC
Shock loads
vibration
Table 2
SMG, SFG
SMG.10, SFG.10
SMG.20, SFG.20
SMG.40, SFG.40
SMG.45, SFG.45
SMGM.50/51/52
SMEM.50/51/52
SMVV, SFVV
SME, SFE
SME.40, SFE.40
SME.45, SFE.45
Corrosive
environment
1
2
3
4
5
6
7
8
9
10
11
4
key
Excellent, very well suited to
indicated conditions.
Average
Not recommended for indicated
conditions
*
*
*
*
*
*
Self-lubricating - maintenance free
SS
SS.10
SS.45
SSA
SSA.10
SSA.45
SSA.50
SSVV
SSE
SSE.45
SSE.50
1
2
5
12
13
14
15
8
9
11
16
*
*
*
*
static loads
The product tables on the following pages refer to axial and radial
static loads. The loads indicated are the maximum allowable.
bearing clearances
The clearances in rod ends and spherical bearings are related
to size, as indicated in the following table. In all cases, the
clearances indicated are the maximum to be expected.
safety factor
The allowable static loads given in our tables have been
determined by dividing the static load at failure by 2.5
Maximum allowable load = load at failure
2.5
Axial and Radial static loads are defined in the following diagrams.
Clearance mm
axial
radial
2–6
0.09
0.03
8 – 12
0.10
0.04
14 – 18 20 – 22 25 – 30 35 – 50
0.12
0.05
0.15
0.06
0.18
0.08
0.20
0.09
This table does not apply to the types listed below which are
produced with minimum clearance to provide a tight fit.
SMG.40, SFG.40
SMGM.50/51/52
SSA.50
SMEM.50/51/52
SMVV, SFVV
SME, SFE
SME.40, SFE.40
SSVV
SSE
SSE.50
Radial static loads
Axial static loads
axial static loads
Allowable axial loads are not stated for rod ends as in most
circumstances the limiting condition will be determined not by
the strength of the head, but by the resistance of the shank to
bending. Where significant, axial loads should be determined
and referred to us for advice.
28
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Tel: +44 (0)1992 509888
angles of misalignment
The angles of misalignment (α) shown
are valid for all rod end and spherical
bearings.
The angle (α) varies depending upon the
type of assembly. Table 3 indicates the
maximum angular misalignment possible
for the three assemblies encountered
most frequently. Angles shown are
rounded to the nearest whole number.
The formulæ shown in Table 4 may be
used to calculate the angle
α
for other
types of assembly
Table 3
Value of
α
angle
α
1
α
2
Table 4
Calculation formulæ
α
1 = tan
–1
α
3
–
(
W D H
)
α
1
Size
2
3
4
5
6
8
10
12
14
16
18
20
22
25
30
35
40
45
50
8°
8°
8°
8°
8°
8°
8°
8°
10°
9°
9°
9°
10°
10°
11°
8°
8°
7°
7°
16°
15°
14°
13°
13°
14°
14°
13°
16°
15°
15°
15°
15°
15°
17°
14°
14°
12°
12°
33°
33°
31°
30°
30°
25°
25°
25°
24°
24°
24°
24°
23°
23°
24°
23°
22°
22°
22°
O
(
H
)
– tan
(
W
)
E
–1
α
2 = cos
–1
α
2
4
α
3
α
3 = cos
–1
(
H
)
– sin
(
B
)
E
E
–1
W
H
D
B
NEOPRENE PROTECTIVE COVERS
Material :
Neoprene,
to NF T 46-018 Standard.
Temperature range : –30°C to +120°C
Good resistance to : oil, grease, chemical agents, sea water,
tropical climate
Not recommended for : permanent contact with rust agents.
Application where the ball is completely
rotated or where there are high
running speeds.
Protective Covers
Order Code
SPR1
SPR2
SPR3
SPR4
Rod End Size
6–8
10 – 12
14 – 18
20 – 25
Spacers
Order Code
SBD 06
SBD 08
SBD 10
SBD 12
SBD 14
SBD 18
ØA
11
12
14
17
19
25
ØB
6
8
10
12
14
18
ØC
8.7
10.3
12.5
15
16.8
21.8
D
6
6
6
8
8
8
E
4
4
4
6
6
6
O
E
α
13°
14°
14°
13°
16°
15°
D
E
ØA
ØB
ØC
α
Fax: +44 (0)1992 509890
29
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