THREAD: AS8879
MATERIAL: 7075 aluminum alloy per AMS-QQ-A-225/9.
Aged to T73 condition per AMS277.
FINISH:
  • KFN626-(*) - Anodized per MIL-A-8625, Type II, Class 2, color black and K76 lubricant.
  • KFN626-(*)A - Anodized per MIL-A-8625, Type II, Class 2, color black and cetyl alcohol lubricant per A/DET0013.
PERFORMANCE: NASM25027, except as follows:
  • 1 cycle use.
  • Maximum locking torque and axial tensile strength to be met when tested with aluminum IVD coated titanium bolts with AS8879 threads having a reduced major diameter such as NAS6803 thru NAS6808.
  • Wrench torque as tabulated.
PACKAGING: Parts are normally supplied in bulk packaging. Add "S" after dash number for spindle packaged nuts for use with K-Fast® automatic tools. (Example: KFN626-4S).
NOTES: "C" and "W" dimensions apply before forming self-locking feature.
1 - 24 of 24 | Results Per Page | View | Unit of Measure
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Item #

A - MAX

B - MIN

C - MIN

D - MIN

H - MAX

M

S - MIN

W

Axial Tensile Strength (LBS. MIN)

Wrench Torque (LBS-IN MIN)

Locking Torque (LBS-IN)

Approx. Weight (LBS/100)

Thread

KFN626-3 N/A 0.322 N/A 0.295 N/A 0.277 N/A 0.194 N/A 0.240 N/A 0.095-0.085 N/A 0.070 N/A 0.251-0.243 N/A 1600 N/A N/A 12.5-2 N/A 0.080 N/A 0.1900-32 UNJF-3B
KFN626-4 N/A 0.422 N/A 0.398 N/A 0.348 N/A 0.254 N/A 0.280 N/A 0.100-0.090 N/A 0.080 N/A 0.313-0.305 N/A 3200 N/A 85 N/A 20.0-3.5 N/A 0.150 N/A 0.2500-28 UNJF-3B
KFN626-5 N/A 0.538 N/A 0.497 N/A 0.419 N/A 0.317 N/A 0.325 N/A 0.100-0.090 N/A 0.100 N/A 0.376-0.367 N/A 5200 N/A 145 N/A 30.0-6.5 N/A 0.380 N/A 0.3125-24 UNJF-3B
KFN626-6 N/A 0.649 N/A 0.577 N/A 0.491 N/A 0.379 N/A 0.365 N/A 0.100-0.090 N/A 0.120 N/A 0.439-0.430 N/A 7000 N/A 240 N/A 40.0-9.5 N/A 0.540 N/A 0.3750-24 UNJF-3B
KFN626-7 N/A 0.743 N/A 0.677 N/A 0.561 N/A 0.442 N/A 0.415 N/A 0.110-0.100 N/A 0.160 N/A 0.502-0.492 N/A 9500 N/A N/A 55.0-14.0 N/A 0.970 N/A 0.4375-20 UNJF-3B
KFN626-8 N/A 0.865 N/A 0.777 N/A 0.631 N/A 0.504 N/A 0.445 N/A 0.110-0.100 N/A 0.160 N/A 0.564-0.553 N/A 12500 N/A N/A 80.0-18.0 N/A 1.260 N/A 0.5000-20 UNJF-3B
KFN626-3A N/A 0.322 N/A 0.295 N/A 0.277 N/A 0.194 N/A 0.240 N/A 0.095-0.085 N/A 0.070 N/A 0.251-0.243 N/A 1600 N/A N/A 12.5-2 N/A 0.080 N/A 0.1900-32 UNJF-3B
KFN626-4A N/A 0.422 N/A 0.398 N/A 0.348 N/A 0.254 N/A 0.280 N/A 0.100-0.090 N/A 0.080 N/A 0.313-0.305 N/A 3200 N/A 85 N/A 20.0-3.5 N/A 0.150 N/A 0.2500-28 UNJF-3B
KFN626-5A N/A 0.538 N/A 0.497 N/A 0.419 N/A 0.317 N/A 0.325 N/A 0.100-0.090 N/A 0.100 N/A 0.376-0.367 N/A 5200 N/A 145 N/A 30.0-6.5 N/A 0.380 N/A 0.3125-24 UNJF-3B
KFN626-6A N/A 0.649 N/A 0.577 N/A 0.491 N/A 0.379 N/A 0.365 N/A 0.100-0.090 N/A 0.120 N/A 0.439-0.430 N/A 7000 N/A 240 N/A 40.0-9.5 N/A 0.540 N/A 0.3750-24 UNJF-3B
KFN626-7A N/A 0.743 N/A 0.677 N/A 0.561 N/A 0.442 N/A 0.415 N/A 0.110-0.100 N/A 0.160 N/A 0.502-0.492 N/A 9500 N/A N/A 55.0-14.0 N/A 0.970 N/A 0.4375-20 UNJF-3B
KFN626-8A N/A 0.865 N/A 0.777 N/A 0.631 N/A 0.504 N/A 0.445 N/A 0.110-0.100 N/A 0.160 N/A 0.564-0.553 N/A 12500 N/A N/A 80.0-18.0 N/A 1.260 N/A 0.5000-20 UNJF-3B
KFN626-3S N/A 0.322 N/A 0.295 N/A 0.277 N/A 0.194 N/A 0.240 N/A 0.095-0.085 N/A 0.070 N/A 0.251-0.243 N/A 1600 N/A N/A 12.5-2 N/A 0.080 N/A 0.1900-32 UNJF-3B
KFN626-4S N/A 0.422 N/A 0.398 N/A 0.348 N/A 0.254 N/A 0.280 N/A 0.100-0.090 N/A 0.080 N/A 0.313-0.305 N/A 3200 N/A 85 N/A 20.0-3.5 N/A 0.150 N/A 0.2500-28 UNJF-3B
KFN626-5S N/A 0.538 N/A 0.497 N/A 0.419 N/A 0.317 N/A 0.325 N/A 0.100-0.090 N/A 0.100 N/A 0.376-0.367 N/A 5200 N/A 145 N/A 30.0-6.5 N/A 0.380 N/A 0.3125-24 UNJF-3B
KFN626-6S N/A 0.649 N/A 0.577 N/A 0.491 N/A 0.379 N/A 0.365 N/A 0.100-0.090 N/A 0.120 N/A 0.439-0.430 N/A 7000 N/A 240 N/A 40.0-9.5 N/A 0.540 N/A 0.3750-24 UNJF-3B
KFN626-7S N/A 0.743 N/A 0.677 N/A 0.561 N/A 0.442 N/A 0.415 N/A 0.110-0.100 N/A 0.160 N/A 0.502-0.492 N/A 9500 N/A N/A 55.0-14.0 N/A 0.970 N/A 0.4375-20 UNJF-3B
KFN626-8S N/A 0.865 N/A 0.777 N/A 0.631 N/A 0.504 N/A 0.445 N/A 0.110-0.100 N/A 0.160 N/A 0.564-0.553 N/A 12500 N/A N/A 80.0-18.0 N/A 1.260 N/A 0.5000-20 UNJF-3B
KFN626-3AS N/A 0.322 N/A 0.295 N/A 0.277 N/A 0.194 N/A 0.240 N/A 0.095-0.085 N/A 0.070 N/A 0.251-0.243 N/A 1600 N/A N/A 12.5-2 N/A 0.080 N/A 0.1900-32 UNJF-3B
KFN626-4AS N/A 0.422 N/A 0.398 N/A 0.348 N/A 0.254 N/A 0.280 N/A 0.100-0.090 N/A 0.080 N/A 0.313-0.305 N/A 3200 N/A 85 N/A 20.0-3.5 N/A 0.150 N/A 0.2500-28 UNJF-3B
KFN626-5AS N/A 0.538 N/A 0.497 N/A 0.419 N/A 0.317 N/A 0.325 N/A 0.100-0.090 N/A 0.100 N/A 0.376-0.367 N/A 5200 N/A 145 N/A 30.0-6.5 N/A 0.380 N/A 0.3125-24 UNJF-3B
KFN626-6AS N/A 0.649 N/A 0.577 N/A 0.491 N/A 0.379 N/A 0.365 N/A 0.100-0.090 N/A 0.120 N/A 0.439-0.430 N/A 7000 N/A 240 N/A 40.0-9.5 N/A 0.540 N/A 0.3750-24 UNJF-3B
KFN626-7AS N/A 0.743 N/A 0.677 N/A 0.561 N/A 0.442 N/A 0.415 N/A 0.110-0.100 N/A 0.160 N/A 0.502-0.492 N/A 9500 N/A N/A 55.0-14.0 N/A 0.970 N/A 0.4375-20 UNJF-3B
KFN626-8AS N/A 0.865 N/A 0.777 N/A 0.631 N/A 0.504 N/A 0.445 N/A 0.110-0.100 N/A 0.160 N/A 0.564-0.553 N/A 12500 N/A N/A 80.0-18.0 N/A 1.260 N/A 0.5000-20 UNJF-3B
1 - 24 of 24 | Results Per Page | View | Unit of Measure
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