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THREAD: AS8879
MATERIAL:
  • Nut - A286 corrosion resistant steel per AMS5731, AMS5732 (UNS S66286) or AMS5737.
  • Washer - 300 Series corrosion resistant steel per AMS-QQ-S-763.
HEAT TREAT: Nut - Rc 46 max.
FINISH:
  • Nut - Passivate per AMS2700 and Kaylube molybdenum disulfide dry lubricant coat per AS5272, Type I.
  • Washer - Passivate per AMS2700.
PERFORMANCE: NASM25027, except as follows:
  • Axial tensile strength as tabulated.
  • 5 seated cycles when tested on 6AL-4V titanium bolts per AMS 4928 or AMS 4967 with a heat treat of 160 KSI to 180 KSI.
APPLICATION: For use on standard to .016 oversize shank bolts.
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: KFN645-4S.
NOTES: "C" and "W" dimensions apply before forming self-locking feature.
Unit of Measure

Specifications

A ± .010

 N/A 0.460

C - MIN

 N/A 0.348

D

 N/A 0.272-0.267

H (± .010)

 N/A 0.340

M

 N/A 0.117-0.107

P ± .010

 N/A 0.277

W

 N/A 0.316-0.306

Axial Tensile Strength (LBS. MIN)

 N/A 5000

Rec'm Seating Torque (LBF-IN)

 N/A 80-100

Y - MAX

 N/A 0.117

Approx. Weight (LBS/100)

 N/A 0.520

Packaging

 N/A Spindle

Thread Type

 N/A Unified

Configuration 1

 N/A 6 Point

Configuration 2

 N/A Captive Washer

Simplified Material

 N/A CRES

Strength

 N/A 125KSI - 900Mpa

Temperature

 N/A 450°F - 235°C

Thread

 N/A 0.2500-28 UNJF-3B