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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 0.520 Inch

B - MIN

 N/A 0.482 Inch

C - MIN

 N/A 0.419 Inch

D - MAX

 N/A 0.342 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 0.039 Inch

R - MIN

 N/A 0.028 Inch

V - REF

 N/A 0.020 Inch

W - MAX

 N/A 0.378 Inch

W - MIN

 N/A 0.367 Inch

Minimum Tensile Strength

 N/A 3700 lb

Approx. Weight

 N/A 0.340 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 0.3125-24 UNJF-3B

Part Family

 N/A THCR 1979-xx