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METRIC INFORMATION
METRIC COMPONENT INFORMATION
In line with the Worldwide trend to Metrication, we are participating in this new Technology, which will improve your
capabilities through additional standardization.
The following Charts provide helpful information for Identifying Torque Ratings.
A
CAUTION: This machine may contain some parts dimensioned in the Metric System as well as in the U.S.
Inch System. Some fasteners are metric and are very close in dimensions to familiar fasteners in the U.S.
Inch System. It is important to note that, during any repair or maintenance procedures, replacement fasten¬
ers must have the same measurements and strength as those removed, whether metric or U.S. inch System. (Num¬
bers on the heads of metric bolts and on surfaces of metric nuts indicate their strength. U.S. Inch System bolts use
radial lines for this purpose, while most U.S. Inch System nuts do not have strength markings.) Mismatched or incor¬
rect fasteners can result in damage or malfunction, or possibly personal injury. Therefore, fasteners removed from
the machine should be saved for reuse in the same locations. Where the fasteners are not satisfactory for reuse,
care should be taken to select a replacement that matches the original.
T-67598
1.
U.S. Inch
FIGURE 1
2.
Metric
CAPSCREW IDENTIFICATION
Customary Screws
Metric Screws
SAE Grade
Head Marking
ProperlyClass
Head Marking
1
None
4.6
4.6
2
None
5.8
5.8
5
3 Radial Lines
8.8
8.8
8
6 Radial Lines
10.9
10.9
See Figure 1
The above markings are the most common although
others may be encountered.
Customary screw threads are designated by diameter
in inches and the pitch in threads per inch.
Examples:
1/2-13 means 1/2 inch diameter, 13 threads per inch
(coarse thread).
1/2-20 means 1/2 inch diameter, 20 threads per inch
(fine thread).
Metric screw threads are designated by diameter in
millimetres and thread pitch in millimetres between
threads.
Examples:
12 x 1.75 means 12 mm diameter, 1.75 mm between
thread (coarse thread).
12 x 1.50 means 12 mm diameter, 1.50 mm between
threads (fine thread).
NOTE:
There is usually only 1 coarse and 1 fine
thread for each customary diameter, however in metric
screws you may have 1 coarse thread and perhaps 3 or
more fine threads for a diameter.
Gauges are available for metric threads and are used in
the same manner as those for customary threads.
61
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