TM 1-1520-240-BD
2-7. SUBSTITUTE HUCK, HI-LOK, OR NAS BOLTS .
Substitute HUCK, HI-LOK or NAS bolts as follows:
HUCK PART NO.
HI-LOK PART NO.
NAS PART NO.
HOLE DIA (INCHES)
R3001-5
HL18-5
NAS1465
0.161 to 0.164
R3001-6
HL18-6
NAS1466
0.185 to 0.188
R3001 -8
HL18-81
NAS1468
0.242 to 0.246
R3001-10
HL18-10
NAS1470
0.307 to 0.310
R3002-5
HL21-5
-
0.161 to 0.164
R3002-6
HL21-6
NAS1956
0.185 to 0.188
R3002-8
HL21 -8
NAS1458
0.242 to 0.246
R3002-10
HL21-10
NAS1460
0.307 to 0.310
NOTE
·
Dash numbers for all bolts are the same.
·
Hole sizes apply to high-shear requirements.
·
Hole sizes do not apply to fasteners of splices installed at sta 160.219 and 439.71.
2-8. SUBSTITUTE JO-BOLTS OR V-BOLTS .
JO-BOLT
V-BOLT
HOLE DIA
PART NO.
PART NO.
(INCHES)
WP 164
BA5A*H
0.164 to 0.168
WP 200
BA6A*H
0.199 to 0.203
WP 260
BA8A*H
0.261 to 0.265
WP 312
BA1OA*H
0.313 to 0.317
WF164
BA5A*F
0.164 to 0.168
WF200
BA6A*F
0.199 to 0.203
WF260
BA8A*F
0.261 to 0.265
WF312
BA1OA*F
0.313 to 0.317
NOTE
·
JO-BOLTS
numbers
refer
to
its
diameter.
·
The asterisk (*) is the position for the
length dash number.
·
These fasteners are used mainly in
blind installations.
2-9. SUBSTITUTE STANDARD BOLTS FOR HUCK
BOLTS.
a.
Bolts or screws can be substituted for HUCK
bolts as follows:
(1) Use standard bolts or screws only when
HUCK bolts or similar fasteners are not available.
(2) Hole diameter must allow thread through with-
out force, but bolt shank must be push fit
b.
When bolts replace HUCK bolts under shear
forces, use NAS1103, NAS1303, NAS464, NAS624 or
Hi-lok HL-18 bolts.
c.
When bolts replace HUCK bolts under tension
forces, use NAS624 bolts.
d.
When replacing 3/16-inch diameter (under
tension forces) HUCK bolts, use NAS1303 bolts.
e.
For emergencies, any steel bolt or screw of
tensile strength 125.000 psi and nominal hole diameter
may be used. This fastener must be replaced within 25
flight hours.
2-38
