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THREAD: AS8879
MATERIAL:
  • Nut - A286 corrosion resistant steel per AMS 5732 or AMS 5737 (UNS S66286).
  • Washer - 300 series corrosion resistant steel per AMS-QQ-S-763.
HEAT TREAT:
  • Nut -Rc 33-44
  • Washer - None required.
FINISH:
  • Nut

    • KFN512C(*) - Passivate per AMS2700, cadmium plate per AMS-QQ-P-416, Type II, Class 2, plus cetyl alcohol lubricant.
    KFN512DL(*) - Passivate per AMS2700 and Kaylube molybdenum disulfide dry lubricant coat per AS5272.
    KFN512E(*) - Passivate per AMS2700, silver plate per AMS2410, plus cetyl alcohol lubricant.
    KFN512J(*) - Silver plate per AMS2410.
    KFN512K(*) - Lubeco 905 solid film lubricant.
    KFN512V(*) - Lubeco 2123 film lubricant.
  • Washer - Passivate per AMS2700.
PERFORMANCE: KFS 1011, except as follows:
  • Axial tensile strength as tabulated.
  • Recommended seating torque as tabulated.
  • Maximum locking torque as tabulated.
  • Metallurgical examination (microstructure) required per 33A056.
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 supplied nuts for use with K-Fast® automatic tools. (Example: KFN512C3S).
NOTES: "C" and "W" dimensions apply prior to forming self-locking feature.
Unit of Measure

Specifications

A - MAX

 N/A 0.460

C - MIN

 N/A 0.348

D

 N/A 0.272-0.267

H - MAX

 N/A 0.340

M

 N/A 0.117-0.107

P - MAX

 N/A 0.277

W

 N/A 0.316-0.306

X

 N/A 0.005

Axial Tensile Strength (LBS. MIN)

 N/A 5000

Rec'm Seating Torque (IN-LBS)

 N/A 115-130

Max. Locking Torque

 N/A 20.000 lb·in

Approx. Weight (LBS/100)

 N/A 0.520

Finish

 N/A Passivate per AMS2700, Plus Kaylube Molybdenum Disulfide Dry Lubricant Coat per AS5272

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