MATERIAL: A 286 Non magnetic heat and corrosion resistant steel.

FINISH:
  • 800° F PHCR 54 - A 286 Silver Plate, AMS 2410.
  • 450° F PHCR 54 M - A 286 Passivated, Dry Film Lubricant.
MARKING: Parts marked with manufacturer’s symbol (SD), plus letter ‘’C’’.

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

PHCR 53 N/A 0.325 Inch N/A 0.291 Inch N/A 0.277 Inch N/A 0.220 Inch N/A 0.109 Inch N/A 0.065 Inch N/A 0.050 Inch N/A 0.1900-32 UNJF-3B
PHCR 54 N/A 0.420 Inch N/A 0.386 Inch N/A 0.348 Inch N/A 0.280 Inch N/A 0.125 Inch N/A 0.100 Inch N/A 0.070 Inch N/A 0.2500-28 UNJF-3B
PHCR 55 N/A 0.520 Inch N/A 0.482 Inch N/A 0.419 Inch N/A 0.342 Inch N/A 0.172 Inch N/A 0.100 Inch N/A 0.070 Inch N/A 0.3125-24 UNJF-3B
PHCR 56 N/A 0.579 Inch N/A 0.539 Inch N/A 0.491 Inch N/A 0.405 Inch N/A 0.219 Inch N/A 0.155 Inch N/A 0.125 Inch N/A 0.3750-24 UNJF-3B
PHCR 57 N/A 0.645 Inch N/A 0.600 Inch N/A 0.562 Inch N/A 0.467 Inch N/A 0.266 Inch N/A 0.155 Inch N/A 0.125 Inch N/A 0.4375-20 UNJF-3B
PHCR 58 N/A 0.770 Inch N/A 0.725 Inch N/A 0.633 Inch N/A 0.530 Inch N/A 0.359 Inch N/A 0.155 Inch N/A 0.125 Inch N/A 0.5000-20 UNJF-3B
PHCR 59 N/A 0.850 Inch N/A 0.815 Inch N/A 0.775 Inch N/A 0.592 Inch N/A 0.391 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 0.5625-18 UNJF-3B
PHCR 510 N/A 0.910 Inch N/A 0.875 Inch N/A 0.846 Inch N/A 0.655 Inch N/A 0.469 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 0.6250-18 UNJF-3B
PHCR 512 N/A 1.130 Inch N/A 1.095 Inch N/A 0.987 Inch N/A 0.785 Inch N/A 0.563 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 0.7500-16 UNJF-3B
PHCR 514 N/A 1.345 Inch N/A 1.300 Inch N/A 1.130 Inch N/A 0.910 Inch N/A 0.656 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 0.8750-14 UNJF-3B
PHCR 516 N/A 1.545 Inch N/A 1.500 Inch N/A 1.272 Inch N/A 1.035 Inch N/A 0.750 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 1.0000-12 UNJF-3B
PHCR 518 N/A 1.745 Inch N/A 1.700 Inch N/A 1.414 Inch N/A 1.160 Inch N/A 0.813 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 1.1250-12 UNJF-3B
PHCR 520 N/A 1.915 Inch N/A 1.875 Inch N/A 1.556 Inch N/A 1.285 Inch N/A 0.875 Inch N/A 0.186 Inch N/A 0.156 Inch N/A 1.2500-12 UNJF-3B
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