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  • F51559 Anchor Nut - Floating, Spring Loaded
THREAD: AS8879
MATERIAL:
  • Nut - 4130 alloy steel (UNS G41300) or 8740 alloy steel (UNS G87400).
  • Basket, Channel and Spring - 17-7PH stainless steel (UNS S17400).
FINISH:
F51559-3-(*), F51559A3-(*) and F51559-4-(*):
  • Nut - Cadmium plate per AMS-QQ-P-416, Type II, Class 2, plus Kaylube molybdenum disulfide dry film lubricant coat per AS5272, Type I.
  • Basket, Channel and Spring - Passivate per AMS2700 and Kaylube molybdenum disulfide dry film lubricant coat per AS5272, Type I.
F51559-3-(*)C, F51559A3-(*)C and F51559-4-(*)C:
  • Nut, Basket and Channel - Cadmium plate per QQ-P-416, Type II, Class 2, plus Kaylube molybdenum disulfide dry film lubricant coat per AS5272, Type I.
  • Spring - Passivate per AMS2700 and Kaylube molybdenum disulfide dry film lubricant coat per AS5272, Type I.
PERFORMANCE: NASM25027, except torque out not required and axial tensile strength of 700 lbs min.
TEMPERATURE: 450°F.
FLOATABILITY:
  • F51559-3-(*) - .150 minimum radially from center.
  • F51559A3-(*) - .100 minimum radially from center.
  • F51559-4-(*) - .100 minimum radially from center.
NOTES: Spring load shall be 25 ± 3 lbs. when the nut element shank protrudes from the bearing surface of the basket a distance equal to the nominal structure thickness. Additional protrusion of .013 ±.007 will cause the nut element flange to bottom out.
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Item #

Structure Thickness
+.004
-.005

D

E

H - MAX

M ± .005

N - REF

P

Approx. Weight (LBS/100)

Thread

N/A 0.185 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.463 N/A 0.323 N/A 0 N/A N/A 2.190 N/A 0.2500-28 UNJF-3B
N/A 0.195 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.473 N/A 0.333 N/A 0 N/A N/A 2.220 N/A 0.2500-28 UNJF-3B
N/A 0.205 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.483 N/A 0.343 N/A 0 N/A N/A 2.230 N/A 0.2500-28 UNJF-3B
N/A 0.215 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.493 N/A 0.353 N/A 0 N/A N/A 2.230 N/A 0.2500-28 UNJF-3B
N/A 0.225 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.503 N/A 0.363 N/A 0 N/A N/A 2.240 N/A 0.2500-28 UNJF-3B
N/A 0.235 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.513 N/A 0.373 N/A 0 N/A N/A 2.250 N/A 0.2500-28 UNJF-3B
N/A 0.245 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.523 N/A 0.383 N/A 0 N/A N/A 2.260 N/A 0.2500-28 UNJF-3B
N/A 0.255 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.533 N/A 0.393 N/A 0 N/A N/A 2.260 N/A 0.2500-28 UNJF-3B
N/A 0.275 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.553 N/A 0.413 N/A 0 N/A N/A 2.290 N/A 0.2500-28 UNJF-3B
N/A 0.285 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.563 N/A 0.423 N/A 0 N/A N/A 2.290 N/A 0.2500-28 UNJF-3B
N/A 0.295 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.573 N/A 0.433 N/A 0 N/A N/A 2.300 N/A 0.2500-28 UNJF-3B
N/A 0.304 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.583 N/A 0.443 N/A 0 N/A N/A 2.300 N/A 0.2500-28 UNJF-3B
N/A 0.314 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.593 N/A 0.453 N/A 0 N/A N/A 2.310 N/A 0.2500-28 UNJF-3B
N/A 0.324 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.603 N/A 0.463 N/A 0 N/A N/A 2.320 N/A 0.2500-28 UNJF-3B
N/A 0.334 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.613 N/A 0.473 N/A 0 N/A N/A 2.320 N/A 0.2500-28 UNJF-3B
N/A 0.344 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.623 N/A 0.483 N/A 0 N/A N/A 2.330 N/A 0.2500-28 UNJF-3B
N/A 0.354 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.633 N/A 0.493 N/A 0 N/A N/A 2.340 N/A 0.2500-28 UNJF-3B
N/A 0.264 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.643 N/A 0.503 N/A 0 N/A N/A 2.350 N/A 0.2500-28 UNJF-3B
N/A 0.374 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.653 N/A 0.513 N/A 0 N/A N/A 2.350 N/A 0.2500-28 UNJF-3B
N/A 0.384 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.663 N/A 0.523 N/A 0 N/A N/A 2.360 N/A 0.2500-28 UNJF-3B
N/A 0.394 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.673 N/A 0.533 N/A 0 N/A N/A 2.370 N/A 0.2500-28 UNJF-3B
N/A 0.035 N/A 0.200-0.195 N/A 0.255-0.250 N/A 0.313 N/A 0.173 N/A 0 N/A N/A 2.050 N/A 0.1900-32 UNJF-3B
N/A 0.040 N/A 0.200-0.195 N/A 0.255-0.250 N/A 0.318 N/A 0.178 N/A 0 N/A N/A 1.990 N/A 0.1900-32 UNJF-3B
N/A 0.045 N/A 0.200-0.195 N/A 0.255-0.250 N/A 0.323 N/A 0.183 N/A 0 N/A N/A 1.990 N/A 0.1900-32 UNJF-3B
N/A 0.055 N/A 0.200-0.195 N/A 0.255-0.250 N/A 0.333 N/A 0.193 N/A 0 N/A N/A 1.990 N/A 0.1900-32 UNJF-3B
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