FF-S-200B
4.2.5 Sampling for chemical analysis. When specified (see 6.2), a
random sample of setscrews shall be taken from each lot in accordance with
QSC Z1.4, Inspection Level S-1, with an AQL of 1.5 percent defective.
Samples previously selected for examination or for the hardness and
decarburization tests may be used.
4.3 Examination. Each setscrew taken as specified in 4.2.2 shall be
examined to verify conformance with this specification. Examination shall be
conducted in accordance with Table I. Any setscrew in the sample containing
one or more defects shall be rejected and if the number of defective
setscrews in any sample exceeds the acceptance number for that sample, the
lot represented by the sample shall be rejected. Short setscrews, that pass
through the no-go gage, shall not cause for rejection, providing the screws
have less than six threads (including the start thread) and the major
diameter shall not be undersize by more than .003 inch.
Table I.
Classification Of Defects.
Categories
Inspection
Defects
Method
Critical
None defined
AQL = 2.5
Major
SIE*
Thread
101
SIE
Socket dimensions
102
AQL = 4.0
Minor
SIE
Magnetic permeability (3.1.2.1.1)
201
SIE
Applicable point dimensions
202
SIE
Setscrew length
203
SIE
Chamfer angle
204
SIE
Eccentricity
205
Visual
Workmanship (3.5)
206
*SIE = Standard Inspection Equipment
4.4
Tests.
4.4.1 Hardness. Each setscrew taken as specified in 4.2.3 shall be
subjected to a hardness test conducted in accordance with ASTM E18.
a. Setscrews having a length of 2 diameters or longer shall be tested
on a transverse section through the threads at a point one-quarter of the
nominal diameter from the axis and one nominal diameter from the point.
b. Setscrews having a length less than 2 diameters shall be tested on
a transverse section through the threads at a point one-quarter of the
nominal diameter from the axis and located at the first full thread from the
point.
c. Setscrews having nominal diameters of 1/4" and larger shall be
tested using the Rockwell C Scale. For sizes smaller than 1/4" the Rockwell
30N Scale shall be used.
6
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