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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 0.579 Inch

B - MIN

 N/A 0.539 Inch

C - MIN

 N/A 0.480 Inch

D - MAX

 N/A 0.405 Inch

F ±.016

 N/A 0.109 Inch

G - MAX

 N/A 0.155 Inch

G - MIN

 N/A 0.125 Inch

H ±.015

 N/A 0.219 Inch

R - MAX

 N/A 0.062 Inch

R - MIN

 N/A 0.042 Inch

V - REF

 N/A 0.025 Inch

W - MAX

 N/A 0.440 Inch

W - MIN

 N/A 0.430 Inch

Minimum Tensile Strength

 N/A 5720 lb

Approx. Weight

 N/A 0.470 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 0.3750-24 UNJF-3B

Part Family

 N/A THCR 1979-xx