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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.
Unit of Measure

Specifications

A - MAX

0.422

B - MIN

0.398

C - MIN

0.348

D - MIN

0.254

H - MAX

0.280

M

0.100-0.090

S - MIN

0.080

W

0.313-0.305

Axial Tensile Strength (LBS. MIN)

3200

Wrench Torque (LBF-IN MIN)

85

Locking Torque (LBF-IN)

20.0-3.5

Approx. Weight (LBS/100)

0.150

Finish

Anodized per MIL-A-8625, Type II, Class 2, Color Black and K76 Lubricant

Packaging

Spindle

Thread Type

Unified

Configuration 1

6 Point

Simplified Material

Aluminum

Strength

80KSI - 550Mpa

Temperature

250°F - 120°C

Thread

0.2500-28 UNJF-3B