Service and Maintenance
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IM 782-12 • DESTINY AIR HANDLERS
Table 37: Screw Torque Values
Nominal screw
size, (dia-thds/in)
Socket head cap screws
Flat head socket
screws
Hollow head setscrews only
Lengths equal or greater than
diameter
For lengths (L) less than diameter
Seating torque
Seating torque
Seating torque
Length (L)
Seating torque
(in-lbs)
(ft-lbs)
(in-lbs)
(in-lbs)
(ft-lbs)
(in)
(in-lbs)
1/4-20NC
150
12.5
100
87
7.3
3/16
50
5/16-11NC
305
25.4
200
165
13.8
1/4
90
3/8-16NC
545
45.4
350
290
24.2
1/4, 5/16
150, 250
1/2-13NC
1300
108.3
N/A
620
51.7
N/A
N/A
5/8-11NC
N/A
N/A
N/A
1225
102.1
N/A
N/A
Table 38:
Belt Deflection Force
Cross section
Sheave diameter (inches)
Deflection force (lbs)/belt deflection force
Smallest sheave
diameter range
RPM range
Cross section A, B, 5V
Cross section AX, BX, 5VX
Min
Max
Min
Max
A, AX
3.0 to 3.6
1000 to 2500
2.8
5.5
3.0
6.1
2501 to 4000
2.1
4.2
2.5
5.0
3.8 to 4.8
1000 to 2500
3.4
6.8
3.7
7.4
2501 to 4000
2.4
5.7
3.2
6.4
5.0 to 7.0
1000 to 2500
4.0
8.0
4.7
9.4
2501 to 4000
3.5
7.0
3.8
7.6
B, BX
3.4 to 4.2
850 to 2500
—
—
3.6
7.2
2501 to 4000
—
—
3.1
6.2
4.4 to 5.6
860 to 2500
4.0
7.9
5.2
10.5
2501 to 4000
3.3
6.7
4.5
9.1
5.8 to 8.6
860 to 2500
4.7
9.4
6.3
12.6
2501 to 4000
4.5
8.9
5.4
10.9
5V, 5VX
4.4 to 6.7
500 to 1749
—
—
7.6
15.2
1750 to 3000
—
—
6.6
13.2
3001 to 4000
—
—
4.2
8.5
7.1 to 10.9
500 to 1740
9.5
18.9
11.0
22.1
1741 to 3000
8.3
16.7
10.0
20.1
11.8 to 16.0
500 to 1740
11.7
23.4
12.7
25.5
1741 to 3000
10.5
21.8
12.5
25.0
