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MATERIAL:A 286 Non magnetic heat and corrosion resistant steel.

FINISH:450° F - A 286 Passivated, Dry Film Lubricant.

MARKING: Parts marked with manufacturer’s symbol (SD), plus letter ‘’C’’.

PERFORMANCE:NASM-25027 Except locking torque values applicable for 5 cycles and tensile strength per table.

THREADS:In accordance with AS 8879 before lubrication.

APPLICATION: These nuts have been designed to replace AN320 castellated nuts on critical aircraft control linkage. This design provides an increase in tensile strength while reducing weight substantially over similar parts.

Contact Howmet for the diameter/type in manufacturing.
Unit of Measure

A - MAX

 N/A 0.420 Inch

B - MIN

 N/A 0.386 Inch

C - MIN

 N/A 0.348 Inch

D - MAX

 N/A 0.280 Inch

F ±.016

 N/A 0.094 Inch

G - MAX

 N/A 0.100 Inch

G - MIN

 N/A 0.070 Inch

H ±.015

 N/A 0.188 Inch

R - MAX

 N/A 0.035 Inch

V - REF

 N/A 0.020 Inch

W - MAX

 N/A 0.315 Inch

W - MIN

 N/A 0.306 Inch

Minimum Tensile Strength

 N/A 2290 lb

Approx. Weight

 N/A 0.240 lb/100

Thread Type

 N/A Unified

Configuration 1

 N/A Castellated Hex

Lock

 N/A Crimp Lock

Simplified Material

 N/A CRES

Temperature

 N/A 450°F - 235°C

Thread

 N/A 0.2500-28 UNJF-3B

Part Family

 N/A THCR 5xx