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MATERIAL:Refractory alloy NC19FeNb (Inconel 718), heat treated for 37-47 HRC.

FINISH:Silver Plate per AMS 2410.

MARKING: Parts marked with manufacturer’s symbol (SD).

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

THREADS:In accordance with AS 8879

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 0.910 Inch

B - MIN

 N/A 0.875 Inch

C - MIN

 N/A 0.836 Inch

D - MAX

 N/A 0.655 Inch

F ±.016

 N/A 0.188 Inch

G - MAX

 N/A 0.186 Inch

G - MIN

 N/A 0.156 Inch

H ±.015

 N/A 0.313 Inch

R - MAX

 N/A 0.078 Inch

R - MIN

 N/A 0.052 Inch

V - REF

 N/A 0.055 Inch

W - MAX

 N/A 0.755 Inch

W - MIN

 N/A 0.743 Inch

Minimum Tensile Strength

 N/A 17060 lb

Approx. Weight

 N/A 1.800 lb/100

Thread Type

 N/A Unified

Configuration 1

 N/A Castellated Hex

Lock

 N/A Crimp Lock

Simplified Material

 N/A Inconel 718

Temperature

 N/A 1200°F - 650°C

Specific Material

 N/A Refractory Alloy NC19FeNb (Inconel 718), heat treated for 37-47 HRC

Thread

 N/A 0.6250-18 UNJF-3B

Part Family

 N/A THCR 1979-xx