Technical data

13773-001
20-60
Page 1
FASTENER IDENTIFICATION AND TORQUE DATA
1. DESCRIPTION
This section contains information on the correct usage and identification of bolts, flat washers, lock wash-
ers, nuts, lock nuts, fittings and torque data. The nuts, bolts, and washers used on the airplane are in
accordance with Air Force Navy Specifications, Military Specifications, and National Aircraft Standards.
CAUTION: Overtorquing of fasteners can result in failed fasteners and/or components. Under torquing a
fastener can result in premature wear of the fastener and/or the fastening material which can
result in failure of the component and/or fastener. Due to the diminished friction torque, self
locking nuts should be replaced with new ones after removal. If you choose to reuse a self-
locking nut, ensure nut has the minimum prevailing drag torque. Nuts or bolts with self-lock-
ing devices must be discarded if the fastener can be fully hand tightened.
Note: Observe torque values and the installation of the recommended safetying device for every
fastener. The end of a flat end bolt or screw shall extend through the nut or nutplate at least
1/32”, or the end of a round or chamfered end bolt or screw shall extend through the nut or
nutplate the full round or chamfer. Do not use MS17826 nuts for tension applications. The
aforementioned nuts can be used on standard and high strength bolts.
2. MAINTENANCE PRACTICES
A. Bolts
Bolts can be identified by the marking(s) located on the head of each bolt. When securing a fastener,
use the torque specifications from the following tables.
When torquing fasteners which do not have a specific torque pattern called out, refer to the general
torque patterns shown. (See Figure 20-601)
CAUTION: Composite and non-composites require different torque values. Make sure to select the
correct torque table.
30 Nov 2000