7 Specifications
50
Meritor Maintenance Manual MM-15103 (Issued 07-17)
7 Specification s
Fasteners
The torque values in Table H are for fasteners that have a light
application of oil on the threads.
앫 If the fasteners are dry: Increase the torque values by 10%.
앫 If the fasteners have a heavy application of oil on the
threads: Decrease the torque values by 10%.
If you do not know the size of the fastener that is being installed,
measure the fastener. Use the following procedure.
American Standard Fasteners
1. Measure the diameter of the threads in inches, dimension X.
Figure 7.1.
2. Count the amount of threads there are in one-inch. Figure 7.1.
3. Compare the size of the fastener measured to the list of
fasteners in Table H to find the correct torque value.
Example
American Standard size fastener is 0.50-13.
앫 0.50 is the diameter of the fastener in inches or dimension
X.
앫 13 is the amount of threads in one-inch.
Metric Fasteners
1. Measure the diameter of the threads in millimeters (mm),
dimension X. Figure 7.2.
2. Measure the distance of 10 threads, point to point in
millimeters (mm), dimension Y. Make a note of dimension Y.
Figure 7.2.
3. Divide the dimension Y by 10. The result will be the distance
between two threads or pitch.
4. Compare the size of the fastener measured to the list of
fasteners in Table H to find the correct torque value.
Figure 7.1
Figure 7.2
Examples
Fastener Type How to Measure
0.50-13
Standard American size
(Figure 7.1)
0.50 = the diameter of the
fastener in inches, dimension
X
13 = the number of threads in
one-inch
M8 x 1.25
Metric (Figure 7.2)
M8 = the diameter in
millimeters, dimension X
1.25 = the distance between
two threads, pitch
Figure 7.1
Figure 7.2
Examples
Fastener Type How to Measure
AMOUNT
OF THREADS
IN 1"
1"
X
1003113a
X DIMENSION = EXAMPLE 1/2"
X
Y
1003114b
PITCH
X DIMENSION = EXAMPLE M8 OR 8 MM
Y DIMENSION = DISTANCE OF 10 THREADS
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