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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)

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N/A 0.135 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.413 N/A 0.273 N/A 0 N/A N/A 2.130 N/A 0.2500-28 UNJF-3B
N/A 0.145 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.423 N/A 0.283 N/A 0 N/A N/A 2.130 N/A 0.2500-28 UNJF-3B
N/A 0.145 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.423 N/A 0.283 N/A 0 N/A N/A 2.130 N/A 0.2500-28 UNJF-3B
N/A 0.155 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.433 N/A 0.293 N/A 0 N/A N/A 2.160 N/A 0.2500-28 UNJF-3B
N/A 0.155 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.433 N/A 0.293 N/A 0 N/A N/A 2.160 N/A 0.2500-28 UNJF-3B
N/A 0.057 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.335 N/A 0.195 N/A 0 N/A N/A 2.020 N/A 0.2500-28 UNJF-3B
N/A 0.065 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.343 N/A 0.203 N/A 0 N/A N/A 2.020 N/A 0.2500-28 UNJF-3B
N/A 0.165 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.443 N/A 0.303 N/A 0 N/A N/A 2.170 N/A 0.2500-28 UNJF-3B
N/A 0.165 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.443 N/A 0.303 N/A 0 N/A N/A 2.170 N/A 0.2500-28 UNJF-3B
N/A 0.175 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.453 N/A 0.313 N/A 0 N/A N/A 2.180 N/A 0.2500-28 UNJF-3B
N/A 0.175 N/A 0.270-0.265 N/A 0.345-0.340 N/A 0.453 N/A 0.313 N/A 0 N/A N/A 2.180 N/A 0.2500-28 UNJF-3B
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 0.185 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 0.195 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 0.205 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 0.215 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 0.225 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 0.235 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 0.245 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
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