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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.
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Item #

A - MAX

B - MIN

C - MIN

D - MAX

F ±.016

G - MAX

G - MIN

Thread

THCR 1979-3 N/A 0.325 Inch N/A 0.291 Inch N/A 0.277 Inch N/A 0.220 Inch N/A 0.094 Inch N/A 0.065 Inch N/A 0.050 Inch N/A 0.1900-32 UNJF-3B
THCR 1979-4 N/A 0.420 Inch N/A 0.386 Inch N/A 0.348 Inch N/A 0.280 Inch N/A 0.094 Inch N/A 0.100 Inch N/A 0.070 Inch N/A 0.2500-28 UNJF-3B
THCR 1979-5 N/A 0.520 Inch N/A 0.482 Inch N/A 0.419 Inch N/A 0.342 Inch N/A 0.094 Inch N/A 0.100 Inch N/A 0.070 Inch N/A 0.3125-24 UNJF-3B
THCR 1979-6 N/A 0.579 Inch N/A 0.539 Inch N/A 0.480 Inch N/A 0.405 Inch N/A 0.109 Inch N/A 0.155 Inch N/A 0.125 Inch N/A 0.3750-24 UNJF-3B
THCR 1979-7 N/A 0.645 Inch N/A 0.600 Inch N/A 0.552 Inch N/A 0.467 Inch N/A 0.109 Inch N/A 0.155 Inch N/A 0.125 Inch N/A 0.4375-20 UNJF-3B
THCR 1979-8 N/A 0.770 Inch N/A 0.725 Inch N/A 0.623 Inch N/A 0.530 Inch N/A 0.141 Inch N/A 0.155 Inch N/A 0.125 Inch N/A 0.5000-20 UNJF-3B
THCR 1979-9 N/A 0.850 Inch N/A 0.815 Inch N/A 0.765 Inch N/A 0.592 Inch N/A 0.188 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 0.5625-18 UNJF-3B
THCR 1979-10 N/A 0.910 Inch N/A 0.875 Inch N/A 0.836 Inch N/A 0.655 Inch N/A 0.188 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 0.6250-18 UNJF-3B
THCR 1979-12 N/A 1.130 Inch N/A 1.095 Inch N/A 0.978 Inch N/A 0.785 Inch N/A 0.250 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 0.7500-16 UNJF-3B
THCR 1979-14 N/A 1.345 Inch N/A 1.300 Inch N/A 1.121 Inch N/A 0.910 Inch N/A 0.313 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 0.8750-14 UNJF-3B
THCR 1979-16 N/A 1.545 Inch N/A 1.500 Inch N/A 1.263 Inch N/A 1.035 Inch N/A 0.375 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 1.0000-12 UNJF-3B
THCR 1979-18 N/A 1.745 Inch N/A 1.700 Inch N/A 1.414 Inch N/A 1.160 Inch N/A 0.406 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 1.1250-12 UNJF-3B
THCR 1979-20 N/A 1.915 Inch N/A 1.875 Inch N/A 1.556 Inch N/A 1.285 Inch N/A 0.469 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 1.2500-12 UNJF-3B
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