71
F L E X S T E E L
®
Belt Tension Rating
Minimum Recommended Pulley Diameters (Percent of Rated Tension)
kN/m
>100% - 125%
75 - 100%
50 - 75%
<50%
Snubs
ST701-ST1169
1000
800
630
400
315
ST1170-ST2629
1250
1000
800
630
400
ST2630-ST3738
1600
1400
1000
800
630
ST3739-ST4088
1800
1600
1250
1000
800
ST4089-ST4906
2000
1800
1400
1000
800
ST4907-ST5432
2000
1800
1400
1250
800
ST5433-ST7499
2400
2000
1600
1250
1000
ST7500-ST7943
2400
2200
1600
1400
1000
ST7944-ST10000
3000
2500
2000
1400
1250
Belt Tension Rating
Minimum Ultimate
Tension
Operating Tension
Cable Diameter
(
nominal)
Cable Pitch
(
Approximate)
Belt Modulus
kN/m
kN/m
mm
mm
kN/m
ST800
800
120
3.6
17.5
58000
ST1000
1000
150
3.6
13.9
72000
ST1250
1250
187
5.2
21.7
90000
ST1600
1600
240
5.2
16.9
115000
ST2000
2000
300
5.2
13.5
144000
ST2500
2500
375
5.2
10.9
180000
ST3150
3150
472
8.0
18.5
227000
ST3500
3500
525
8.0
16.6
252000
ST4000
4000
600
9.2
19.1
288000
ST4500
4500
675
10.0
20.5
324000
ST5000
5000
750
11.0
20.8
360000
ST5400
5400
810
11.0
19.4
389000
ST6000
6000
900
12.4
21.6
432000
ST6500
6500
975
12.4
20.1
468000
ST7000
7000
1049
12.4
18.8
504000
ST7500
7500
1124
CONTACT VEYANCE
540000
ST8000
8000
1199
576000
ST8500
8500
1274
612000
ST9000
9000
1349
648000
ST9500
9500
1424
684000
ST10000
10000
1499
720000
Belt Tension Rating
kN/m ST800
ST1000 ST1250 ST1600 ST2000 ST2500 ST3150 ST3500
Carcass Weight
(
kg/m
2
)
6.8
7.4
10.3
11.3
12.6
14.2
20.4
21.5
Belt Tension Rating
kN/m ST4000 ST4500 ST5000 ST5400 ST6000 ST6500 ST7000
Carcass Weight
(
kg/m
2
)
24.6
27.0
31.0
32.5
36.4
38.4
40.3
Cover Compound
Stacker
Style BII
ARMA SBR
Compound P
Cover Weight per 1mm (kg/m
2
)
1.13
1.15
1.25
1.14
FLEXSTEEL BELT WEIGHT - Metric
Approximate belt weight = carcass weight + cover weight. Minimum pulley cover requirements for belts with Sensor Guard® 3/16". Contact VTI Rep for minimum pulley cover that applies to your application. Minimum cover gauge
is dependent on the belt rating.
RECOMMENDED PULLEY DIAMETERS - Metric
Snubs are defined as having 6" or less belt contact and tension less than 50% of belt rating. Pulley sizes for Flexsteel belts are determined by face pressure on the pulley and/or the pulley-to-cable diameter ratio. All pulleys must be flat
as crowned pulleys will cause excessive center tension in the high modulus steel cable product.
FLEXSTEEL STANDARD SPECIFICATIONS - Metric
Tension ratings are available in addition to those shown above. Other cable diameters may be substituted according to individual requirements.Operating tensions are based on a 6.67:1 safety factor. Cable pitch based on 1220mm wide belts.
Minimum transition distance (W = Belt Width) by Idler Angle
Percent of rated tension
20
deg
35
deg
45
deg
More than 90%
4.0
W
6.8
W
8.0
W
60%
to 90%
3.2
W
5.2
W
6.4
W
Less than 60%
2.0
W
3.6
W
4.4
W
recommended minimum transition distance at full trough depth
Belt Tension Rating
kN/m
ST701-ST1169 ST1170-ST2629 ST2630-ST3738 ST3739-ST4089 ST4090-ST4906 ST4907-ST5432 ST5433-ST7499
Cable Diameter
mm
3.6
5.2
8.0
9.2
10.0
11.0
12.4
FLEXSTEEL BELT THICKNESS - Metric
Approximate belt thickness = cable diameter + cover guages.