CHAPTER 20
PAGE 5
PAGE DATE: 1. March 2011
MAINTENANCE MANUAL EXTRA 330LX
AN-Bolts
Hex head AN aircraft bolts are made of high-strength type
4037 or 8740 alloy steel. The bolts are centerless ground,
threaded after heat treatment and cadmium plated per speci-
fication QQ-P-416A, Type II, Class 3.
For the EXTRA 330LX bolts with shanks drilled for cotter
pins or drilled heads for safety wires are used. The adding
letter "A" after the dash number specifies bolts with undrilled
shank. For bolts with drilled head a letter "H" is added after
the AN number. The length of AN aircraft bolts is measured
from under the head to the end of the shank.
Example: AN 3 - 5A
Bolt Head Identification AN hex head bolt
Diameter
3
/
16
" (4.8 mm) Length
5
/
8
" (15.9 mm)
Undrilled shank
DIN-Bolts
Hex head DIN 931, DIN 933 and hex socket head DIN 912
bolts are standard bolts made of steel with undrilled shank.
The surface treatment is chromalized yellow.
Unlike the DIN 931 and DIN 912 the shank of a DIN 933 bolt
goes up to the head. The numerical code shown on the head
of a DIN bolt specifies the strength type. Also, most bolts
will bear a wide variety of initials or symbols which identify
the manufacturer. Measure the diameter and length to specify
the type dimension of the DIN bolt. The length of DIN bolt
is measured from under the head to the end of the shank.
Letter (special bolt) (also adjacent)
Cross (Alloy Steel)
Letter (Identification of Manufacturer,
not always given.)
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