10-4 Common Hardware TP-5648 8/93
8.8
Hex. Head Lock Nut or
Nylock Nut
Square Nut Cap Nut or
Acorn Nut
Wing Nut
Plain
Washer
Split Lock
Washer or
Spring Washer
Internal
Tooth Lock
Washer
Internal-External
Tooth Lock Washer
Nuts
STYLES
GRADE (HARDNESS)
Grade 2 Grade 5
American Standard
Metric
12.9
10.9
6.8
SAMPLE DIMENSIONS
1/4-20
Major Thread Diameter In Fractional
Inches Or Screw Number Size
Threads Per Inch
American Standard
Metric
M8-1.25
Major Thread Diameter In Millimeters Distance Between Threads In Millimeters
Washers
STYLES
GRADE (HARDNESS)
There is no marking to identify hardness. Usually hardened washers have a
black oxide or black phosphate finish rather than a zinc (silver-colored) finish.
SAMPLE DIMENSIONS
9/32 x 5/8 x 1/16
Plain Washers
Internal Dimension Thickness
External Dimension
Lock Washers
Internal Dimension
5/8
Spring Washer
or Wave Washer
External
Tooth Lock
Washer
Figure 10-4. Nuts and Washers
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