TP-5648 8/93 Common Hardware 10-3
Common Hardware Identification
Common hardware has many different head, drive, and
grade (hardness) styles. Some of the more common
types are shown in Figure 10-3, below, and in
Figure 10-4, next page. This is a guide for identification
purposes. Not all generator hardware used is shown.
Hex. Head or
Machine Head
Hex. Head or
Machine Head
with Washer
Hex. Head or
Machine Head
Flat Head
Round
Head
Pan
Head
Socket
Head Cap
or Allen
Head Cap
Socket Head or
Allen Head
Shoulder Bolt
Stud
Screws/Bolts/Studs
Sheet Metal
Screw
HEAD STYLES
GRADE (HARDNESS)
Grade 2 Grade 5 Grade 8 Grade 8/9
DRIVE STYLES
Hex. Hex. and
Slotted
Phillips Slotted Hex. Socket
American Standard
Metric
12.910.98.86.8
1/4-20 x 1
Major Thread Diameter In Fractional
Inches Or Screw Number Size
Length In Inches
Threads Per Inch
SAMPLE DIMENSIONS
American Standard
Metric
M8-1.25 x 20
Major Thread Diameter In Millimeters Length In Millimeters
Distance Between Threads In Millimeters
Figure 10-3. Screws/Bolts/Studs