THREAD: AS8879
MATERIAL: Carbon steel, heat treated.
FINISH: Cadmium plated per AMS-QQ-P-416, Type II, Class 2. Kaylube molybdenum disulfide dry lubricant coated per AS5272.
PERFORMANCE: NASM25027, except axial tensile strength as tabulated, based on 160 000 PSI.
TEMPERATURE: 450°F.
VARIATIONS: Add "BC" for bottom countersunk rivet holes. Example: K3400-3BC.
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Item #

A ± .005

B - REF

C ± .002

D - MIN

E REF

F ± .015

H - MAX

L - MAX

R
+.005
-.000

T - REF

Axial Tensile Strength (LBS. MIN)

Approx. Weight (LBS/100)

Thread

K3400-06 N/A 0.344 N/A 0.250 N/A 0.486 N/A 0 N/A 0.149 N/A 0.125 N/A 0.145 N/A 0.637 N/A 0.098 N/A 0.032 N/A 1600 N/A 0.200 N/A 0.1380-32 UNJC-3B
K3400-08 N/A 0.344 N/A 0.250 N/A 0.486 N/A 0.168 N/A 0.149 N/A 0.125 N/A 0.215 N/A 0.637 N/A 0.098 N/A 0.032 N/A 2500 N/A 0.240 N/A 0.1640-32 UNJC-3B
K3400-3 N/A 0.344 N/A 0.250 N/A 0.486 N/A 0.194 N/A 0.164 N/A 0.156 N/A 0.220 N/A 0.653 N/A 0.098 N/A 0.032 N/A 3620 N/A 0.250 N/A 0.1900-32 UNJF-3B
K3400-4 N/A 0.500 N/A 0.250 N/A 0.707 N/A 0.254 N/A 0.207 N/A 0.312 N/A 0.281 N/A 0.852 N/A 0.098 N/A 0.040 N/A 6470 N/A 0.500 N/A 0.2500-28 UNJF-3B
K3400-5 N/A 0.500 N/A 0.282 N/A 0.707 N/A 0.317 N/A 0.253 N/A 0.375 N/A 0.328 N/A 0.914 N/A 0.130 N/A 0.050 N/A 10200 N/A 0.820 N/A 0.3125-24 UNJF-3B
K3400-6 N/A 0.500 N/A 0.282 N/A 0.707 N/A 0.379 N/A 0.307 N/A 0.375 N/A 0.344 N/A 0.968 N/A 0.130 N/A 0.060 N/A 15200 N/A 0.990 N/A 0.3750-24 UNJF-3B
K3400-06BC N/A 0.344 N/A 0.250 N/A 0.486 N/A 0 N/A 0.149 N/A 0.125 N/A 0.145 N/A 0.637 N/A 0.098 N/A 0.032 N/A 1600 N/A 0.200 N/A 0.1380-32 UNJC-3B
K3400-08BC N/A 0.344 N/A 0.250 N/A 0.486 N/A 0.168 N/A 0.149 N/A 0.125 N/A 0.215 N/A 0.637 N/A 0.098 N/A 0.032 N/A 2500 N/A 0.240 N/A 0.1640-32 UNJC-3B
K3400-3BC N/A 0.344 N/A 0.250 N/A 0.486 N/A 0.194 N/A 0.164 N/A 0.156 N/A 0.220 N/A 0.653 N/A 0.098 N/A 0.032 N/A 3620 N/A 0.250 N/A 0.1900-32 UNJF-3B
K3400-4BC N/A 0.500 N/A 0.250 N/A 0.707 N/A 0.254 N/A 0.207 N/A 0.312 N/A 0.281 N/A 0.852 N/A 0.098 N/A 0.040 N/A 6470 N/A 0.500 N/A 0.2500-28 UNJF-3B
K3400-5BC N/A 0.500 N/A 0.282 N/A 0.707 N/A 0.317 N/A 0.253 N/A 0.375 N/A 0.328 N/A 0.914 N/A 0.130 N/A 0.050 N/A 10200 N/A 0.820 N/A 0.3125-24 UNJF-3B
K3400-6BC N/A 0.500 N/A 0.282 N/A 0.707 N/A 0.379 N/A 0.307 N/A 0.375 N/A 0.344 N/A 0.968 N/A 0.130 N/A 0.060 N/A 15200 N/A 0.990 N/A 0.3750-24 UNJF-3B
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