MATERIAL:Alloy Steel - Heat treated

FINISH:
  • 450° F THCR 354 Alloy steel, Cadmium Plate per AMS QQ-P-416, Type II, Class 2. + Cetyl alcohol.
  • 450° F THCR 354 S7 Alloy steel, Cadmium Plate + Soluble Lubricant (SPS 7 or Kaylube K76).
  • 450° F THCR 354 M Alloy steel, Cadmium Plate per AMS QQ-P-416, type and class optional if lubricated nuts meet salt spray requirement of AMS-QQ-P-416,type II. + dry Film Lubricant.
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 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 Alcoa 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 353 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 354 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 355 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 356 N/A 0.579 Inch N/A 0.539 Inch N/A 0.491 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 357 N/A 0.645 Inch N/A 0.600 Inch N/A 0.562 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 358 N/A 0.770 Inch N/A 0.725 Inch N/A 0.633 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 359 N/A 0.850 Inch N/A 0.815 Inch N/A 0.775 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 3510 N/A 0.910 Inch N/A 0.875 Inch N/A 0.846 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 3512 N/A 1.130 Inch N/A 1.095 Inch N/A 0.987 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 3514 N/A 1.345 Inch N/A 1.300 Inch N/A 1.130 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 3516 N/A 1.545 Inch N/A 1.500 Inch N/A 1.272 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 3518 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 3520 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
THCR 353 S7 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 354 S7 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 355 S7 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 356 S7 N/A 0.579 Inch N/A 0.539 Inch N/A 0.491 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 357 S7 N/A 0.645 Inch N/A 0.600 Inch N/A 0.562 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 358 S7 N/A 0.770 Inch N/A 0.725 Inch N/A 0.633 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 359 S7 N/A 0.850 Inch N/A 0.815 Inch N/A 0.775 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 3510 S7 N/A 0.910 Inch N/A 0.875 Inch N/A 0.846 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 3512 S7 N/A 1.130 Inch N/A 1.095 Inch N/A 0.987 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 3514 S7 N/A 1.345 Inch N/A 1.300 Inch N/A 1.130 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 3516 S7 N/A 1.545 Inch N/A 1.500 Inch N/A 1.272 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 3518 S7 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
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