THREAD: AS8879
MATERIAL: Carbon steel, heat treated.
FINISH: Cadmium plate per AMS-QQ-P-416, Type II, Class 2, plus Kaylube molybdenum disulfide dry film lubricant coat 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: MK1400-4BC.
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Item #

A ± .005

B - REF

C ± .002

D - MIN

H - MAX

L - MAX

R
+.005
-.000

T - REF

W - MAX

Axial Tensile Strength (LBS. MIN)

Approx. Weight (LBS/100)

Thread

MK1400-04 N/A 0.203 N/A 0.215 N/A 0.406 N/A N/A N/A 0.130 N/A 0.614 N/A 0.098 N/A 0.025 N/A 0.260 N/A 1120 N/A 0.090 N/A 0.1120-40 UNJC-3B
MK1400-06 N/A 0.218 N/A 0.215 N/A 0.437 N/A N/A N/A 0.145 N/A 0.661 N/A 0.098 N/A 0.032 N/A 0.260 N/A 1600 N/A 0.120 N/A 0.1380-32 UNJC-3B
MK1400-08 N/A 0.234 N/A 0.215 N/A 0.468 N/A 0.168 N/A 0.215 N/A 0.692 N/A 0.098 N/A 0.032 N/A 0.260 N/A 2500 N/A 0.170 N/A 0.1640-32 UNJC-3B
MK1400-3 N/A 0.250 N/A 0.215 N/A 0.500 N/A 0.194 N/A 0.220 N/A 0.724 N/A 0.098 N/A 0.032 N/A 0.328 N/A 3620 N/A 0.200 N/A 0.1900-32 UNJF-3B
MK1400-4 N/A 0.281 N/A 0.215 N/A 0.562 N/A 0.254 N/A 0.281 N/A 0.786 N/A 0.098 N/A 0.040 N/A 0.414 N/A 6470 N/A 0.350 N/A 0.2500-28 UNJF-3B
MK1400-5 N/A 0.359 N/A 0.290 N/A 0.718 N/A 0.317 N/A 0.328 N/A 1.006 N/A 0.130 N/A 0.050 N/A 0.505 N/A 10200 N/A 0.600 N/A 0.3125-24 UNJF-3B
MK1400-04BC N/A 0.203 N/A 0.215 N/A 0.406 N/A N/A N/A 0.130 N/A 0.614 N/A 0.098 N/A 0.025 N/A 0.260 N/A 1120 N/A 0.090 N/A 0.1120-40 UNJC-3B
MK1400-06BC N/A 0.218 N/A 0.215 N/A 0.437 N/A N/A N/A 0.145 N/A 0.661 N/A 0.098 N/A 0.032 N/A 0.260 N/A 1600 N/A 0.120 N/A 0.1380-32 UNJC-3B
MK1400-08BC N/A 0.234 N/A 0.215 N/A 0.468 N/A 0.168 N/A 0.215 N/A 0.692 N/A 0.098 N/A 0.032 N/A 0.260 N/A 2500 N/A 0.170 N/A 0.1640-32 UNJC-3B
MK1400-3BC N/A 0.250 N/A 0.215 N/A 0.500 N/A 0.194 N/A 0.220 N/A 0.724 N/A 0.098 N/A 0.032 N/A 0.328 N/A 3620 N/A 0.200 N/A 0.1900-32 UNJF-3B
MK1400-4BC N/A 0.281 N/A 0.215 N/A 0.562 N/A 0.254 N/A 0.281 N/A 0.786 N/A 0.098 N/A 0.040 N/A 0.414 N/A 6470 N/A 0.350 N/A 0.2500-28 UNJF-3B
MK1400-5BC N/A 0.359 N/A 0.290 N/A 0.718 N/A 0.317 N/A 0.328 N/A 1.006 N/A 0.130 N/A 0.050 N/A 0.505 N/A 10200 N/A 0.600 N/A 0.3125-24 UNJF-3B
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