THREAD: AS8879
MATERIAL: Alloy steel.
HEAT TREAT: Rc 39-43 per AMS-H-6875.
FINISH: Cadmium plate per AMS-QQ-P-416, Type II, Class 3, and Kaylube molybdenum disulfide dry film lubricant per AS5272.
PERFORMANCE: NASM25027, except axial tensile strength as tabulated.
APPLICATION: For use on standard to .032 oversize shank bolts.
NOTES: Special wrench configuration, for use only with Kaylock WS603 socket.
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Item #

A

D

H - MAX

M

Spline Size No.

Axial Tensile Strength (LBS. MIN)

Approx. Weight (LBS/100)

Thread

KFN644-08 N/A 0.292-0.288 N/A 0.202-0.198 N/A 0.250 N/A 0.112-0.102 N/A -7 N/A 3460 N/A 0.230 N/A 0.1640-32 UNJC-3B
KFN644-3 N/A 0.322-0.318 N/A 0.228-0.224 N/A 0.260 N/A 0.112-0.102 N/A -8 N/A 4000 N/A 0.260 N/A 0.1900-32 UNJF-3B
KFN644-4 N/A 0.422-0.418 N/A 0.288-0.284 N/A 0.320 N/A 0.117-0.107 N/A -10 N/A 7500 N/A 0.420 N/A 0.2500-28 UNJF-3B
KFN644-5 N/A 0.538-0.532 N/A 0.350-0.346 N/A 0.405 N/A 0.127-0.117 N/A -12 N/A 11750 N/A 1.080 N/A 0.3125-24 UNJF-3B
KFN644-6 N/A 0.649-0.642 N/A 0.413-0.409 N/A 0.440 N/A 0.127-0.117 N/A -14 N/A 18000 N/A 1.510 N/A 0.3750-24 UNJF-3B
KFN644-7 N/A 0.743-0.737 N/A 0.476-0.472 N/A 0.515 N/A 0.142-0.132 N/A -18 N/A 23750 N/A 2.260 N/A 0.4375-20 UNJF-3B
KFN644-8 N/A 0.865-0.855 N/A 0.538-0.534 N/A 0.570 N/A 0.142-0.132 N/A -20 N/A 32000 N/A 3.450 N/A 0.5000-20 UNJF-3B
KFN644-9 N/A 0.880-0.870 N/A 0.601-0.597 N/A 0.670 N/A 0.150-0.140 N/A -22 N/A 40000 N/A 3.930 N/A 0.5625-18 UNJF-3B
KFN644-10 N/A 1.010-1.000 N/A 0.663-0.659 N/A 0.735 N/A 0.150-0.140 N/A -24 N/A 50000 N/A 4.220 N/A 0.6250-18 UNJF-3B
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