THREAD: AS8879
MATERIAL: Carbon steel, heat treated.
FINISH: Cadmium plated per fed spec AMS-QQ-P-416, Type II, Class 2 and 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: MK3340-04BC.
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Item #

A - MAX

B - REF

C ± .005

E REF

H - MAX

J ± .002

K +.005 / -.000

V - REF

Axial Tensile Strength (LBS. MIN)

Approx. Weight (LBS/100)

Thread

MK3340-04 N/A 0.331 N/A 0.150 N/A 0.148 N/A 0.094 N/A 0.130 N/A 0.210 N/A 0.066 N/A 0.025 N/A 1120 N/A 0.050 N/A 0.1120-40 UNJC-3B
MK3340-06 N/A 0.379 N/A 0.150 N/A 0.172 N/A 0.117 N/A 0.145 N/A 0.243 N/A 0.066 N/A 0.032 N/A 1600 N/A 0.080 N/A 0.1380-32 UNJC-3B
MK3340-04BC N/A 0.331 N/A 0.150 N/A 0.148 N/A 0.094 N/A 0.130 N/A 0.210 N/A 0.066 N/A 0.025 N/A 1120 N/A 0.050 N/A 0.1120-40 UNJC-3B
MK3340-06BC N/A 0.379 N/A 0.150 N/A 0.172 N/A 0.117 N/A 0.145 N/A 0.243 N/A 0.066 N/A 0.032 N/A 1600 N/A 0.080 N/A 0.1380-32 UNJC-3B
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