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THREAD: AS8879
MATERIAL:
  • Nut - AISI 8740, 4130, 4140 or 4037 alloy steel.
  • Washer - 2024 aluminum alloy per QQ-A-250/4 or QQ-A-250/5.
HEAT TREAT:
  • Nut - Rc 46 max.
  • Washer - Age to T6 condition per AMS2770.
FINISH:
  • Nut - Cadmium plated per AMS-QQ-P-416, Type II, Class 2, plus Kaylube molybdenum disulfide dry lubricant coat per AS5272, Type I.
  • Washer - Anodize per MIL-A-8625, dye color red (optional).
PERFORMANCE: NASM25027, except as follows:
  • Axial tensile strength as tabulated.
  • Use NAS1581A series bolts or equivalent, alloy steel, cadmium plated without cetyl alcohol.
APPLICATION: For use on standard to .0156 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: KFN689-4S.
NOTES: "C" and "W" dimensions apply before forming self-locking feature.
Unit of Measure

Specifications

A

 N/A 0.475-0.455

C - REF

 N/A 0.355

D

 N/A 0.272-0.268

H (± .010)

 N/A 0.360

M - REF

 N/A 0.127

N

 N/A 0.155-0.115

P - REF

 N/A 0.293

W

 N/A 0.316-0.302

Axial Tensile Strength (LBS. MIN)

 N/A 5500

Packaging

 N/A Bulk

Thread Type

 N/A Unified

Configuration 1

 N/A 6 Point

Configuration 2

 N/A Captive Washer

Simplified Material

 N/A Alloy Steel

Temperature

 N/A 450°F - 235°C

Thread

 N/A 0.2500-28 UNJF-3B