MIL-DTL-45916C
4.4.1 Test Blocks. Test blocks shall be fabricated as specified in Figures 2 and 3. Larger test
blocks for multiple testing of inserts are permissible when proper distance between holes is
maintained.
4.4.2 Test bolts and screws. Bolts and screws for use in all tests shall have Class 3A
threads. Bolts and screws used for the internal thread self-locking test shall have 125,000 PSI
minimum ultimate tensile strength and shall be cadmium plated in accordance with SAE AMS-
QQ-P-416, Type II, Class 3. Bolts and screws used for the pullout and rotational resistance tests
shall have 180,000 PSI minimum ultimate tensile strength and shall be cadmium plated in
accordance with SAE AMS-QQ-P-416, Type II, Class 3.
4.5 Examination. Each insert taken as specified in 4.3.1 shall be examined to verify
conformance with this specification. Examination shall be conducted in accordance with Table III.
Any insert in the sample containing one or more defects shall be rejected, and if the number of
defective inserts in any sample exceeds the acceptance number for that category, the lot
represented by the sample shall be rejected.
TABLE III. Classification of Defects.
Inspection
Category
Defect
Method
Critical
None defined
Major
101
Material (3.1)
Visual
102
Protective coating, missing or incomplete
Visual
103
Lubrication (3.3 & 4.5.1)
Visual & SIE*
104
Dimensions, except length (3.4)
SIE
105
Thread locking feature, missing or incomplete (3.5)
Visual
106
Threads (3.6, 3.6.1 & 3.6.2)
SIE
107
Concentricity (3.6.4 & 4.5.3)
SIE
108
Surface roughness (3.7)
SIE
109
Discontinuities (3.9 & 4.5.2)
Visual & SIE
Minor
201
Length (3.4)
SIE
202
Lead threads (3.6.3)
Visual
203
Workmanship (3.10)
Visual
*SIE - Standard Inspection Equipment
4.5.1 Lubrication. The solid film lubricant coating used on Type II inserts shall be examined
visually and microscopically at 10X magnification for uniformity in color, smoothness and
thickness, evidence of cracks, bubbles, blisters, runs, foreign matter, grit, separation of
ingredients and any other surface imperfections, and to verify conformance with 3.3.
4.5.2 Discontinuities. Magnetic particle inspection in accordance with ASTM E1444/E1444M
for carbon steel and penetrant particle inspection in accordance with ASTM E1417/E1417M for
corrosion-resisting steel shall be used to determine the presence of cracks, laps, seams and
inclusions. Magnetic particle or penetrant indications alone shall not be cause for rejection, and
such inserts shall be sectioned and discontinuities measured microscopically under 10X
magnification to determine conformance with 3.9. The inspection shall be performed on finished
inserts, free of lubrication and subsequent to any processing operation which could adversely
affect the inserts.
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