THREAD: AS8879
MATERIAL: Carbon steel, heat treated.
FINISH: Cadmium plated per AMS-QQ-P-416, Type II. Kaylube molybdenum disulfide dry lubricant coated per AS5272.
PERFORMANCE: NASM25021, except axial tensile strenght 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

MK1340-04 N/A 0.148 N/A 0.162 N/A 0.296 N/A 0 N/A 0.130 N/A 0.456 N/A 0.066 N/A 0.025 N/A 0.194 N/A 1120 N/A 0.050 N/A 0.1120-40 UNJC-3B
MK1340-06 N/A 0.172 N/A 0.162 N/A 0.343 N/A 0 N/A 0.145 N/A 0.503 N/A 0.066 N/A 0.032 N/A 0.242 N/A 1600 N/A 0.080 N/A 0.1380-32 UNJC-3B
MK1340-04BC N/A 0.148 N/A 0.162 N/A 0.296 N/A 0 N/A 0.130 N/A 0.456 N/A 0.066 N/A 0.025 N/A 0.194 N/A 1120 N/A 0.050 N/A 0.1120-40 UNJC-3B
MK1340-06BC N/A 0.172 N/A 0.162 N/A 0.343 N/A 0 N/A 0.145 N/A 0.503 N/A 0.066 N/A 0.032 N/A 0.242 N/A 1600 N/A 0.080 N/A 0.1380-32 UNJC-3B
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