TM 1-1500-204-23-6
a. Clevis Pins. Clevis pins (flat-head), MS20392, as shown in figure 2-46, are usually used with tie rod terminals.
This pin may be used in secondary controls not subjected to continuous operation, and where chances of working loose
are negligible The pin should be safetied with a cotter pin and installed with the head up, when possible, so the pin will
remain in place if the cotter pin fails or works out.
Figure 2-46. Clevis Pin
Figure 2-47. Plain Taper Pin
b. Taper Pins. Use taper pins in joints which carry loads where absence of play is essential (Commonly used tapers
are as follows Brown and Sharpe taper (1/2 inch per foot), Morse taper (5/8 inch per foot), and American standard (1/4
inch per foot).
(1)
Plain taper pins. Plain taper pins, MS24692, as shown in figure 2-47, are drilled at the large end and are
usually safetied with lockwire.
(2)
Threaded taper pins. Threaded taper pins, AN386, as shown in figure 2-48, are used with taper pin
washers, AN975, and shear nuts, AN320 They are safetied with cotter pins, MS24665, or safetied with self-locking nuts,
MS21083 (These Brown and Sharpe pins are installed in a standard "B & S" tapered socket.) The pin is set with a light
tap from a rawhide or nylon mallet. The small end of the taper is installed flush or not more than .060 inch above the
surface of the component. It is permissible to install a large size pin in some cases. Refer to the specific aircraft
maintenance manual for maximum allowable size and required torque on the nut
Figure 2-48. Threaded Taper Pin
Figure 2-49. Safety Retaining Pins
c. Safety Retaining Pins. Use safety retaining pins, AN416, as shown in figure 2-49, to secure Items such as clevis
pins, MS20392, small chains, checklists, and other similar items.
d. Spring Pins. The spring pin, as shown in figure 2-50, is a slotted or coiled and chamfered pin, heat-treated to
achieve optimum toughness, resilience, and shear strength Spring pins are stronger than mild carbon steel straight pins,
taper pins, or grooved pins of equivalent sizes.
Figure 2-50. Spring Pin
2-43
