THREAD: AS8879
MATERIAL:
  • Nut - 7075 aluminum alloy per AMS-QQ-A-225/9 (UNS A97075).
  • Seal - Teflon per ASTM-D-1710.
HEAT TREAT:
  • Nut - T73 condition.
  • Seal - None.
FINISH:
  • Nut - Anodize per MIL-A-8625, blue dye, and cetyl alcohol lubricant.
  • Seal - None.
PERFORMANCE: KFS 1008.
NOTES:
  1. Nut design incorporates positive retention of sealing ring.
  2. "C" and "W" dimensions apply before forming self-locking feature.
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Item #

A - MAX

B

C - MIN

D

H - MAX

M

Q

W

Axial Tensile Strength (LBS. MIN)

Approx. Weight (LBS/100)

Thread

KFN686-08 N/A 0.313 N/A 0.189-0.186 N/A 0.244 N/A 0.177-0.164 N/A 0.252 N/A 0.092-0.088 N/A 0.039-0.019 N/A 0.220-0.212 N/A 1530 N/A 0.090 N/A 0.1640-32 UNJC-3B
KFN686-3 N/A 0.348 N/A 0.208-0.203 N/A 0.277 N/A 0.203-0.190 N/A 0.260 N/A 0.092-0.088 N/A 0.041-0.021 N/A 0.251-0.243 N/A 1950 N/A 0.100 N/A 0.1900-32 UNJF-3B
KFN686-4 N/A 0.461 N/A 0.275-0.270 N/A 0.347 N/A 0.268-0.254 N/A 0.335 N/A 0.111-0.107 N/A 0.045-0.025 N/A 0.313-0.306 N/A 3200 N/A 0.160 N/A 0.2500-28 UNJF-3B
KFN686-5 N/A 0.636 N/A 0.349-0.344 N/A 0.419 N/A 0.323-0.318 N/A 0.430 N/A 0.127-0.117 N/A 0.045-0.025 N/A 0.376-0.367 N/A 5400 N/A 0.310 N/A 0.3125-24 UNJF-3B
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