RR-C-271F
4.4.2.4 Type VI, rings.
4.4.2.4.1 Proof test. Samples selected in accordance with 4.2.2.2.1 shall be subjected to the proof and breaking loads shown in table XVIII. Before testing, the inside diameter of the ring shall be measured perpendicular to the axis to which the load is to be applied. After applying the proof load, the diameter shall be remeasured and the sample shall be considered satisfactory if there is no measurable reduction in the diameter.
4.4.2.4.2 Breaking load test. Samples subjected to the breaking load test shall withstand the breaking loads shown in table XVIII.
4.4.2.4.3 Rejections. If any ring fails to pass the proof load or breaking load tests, all rings of the lot shall be rejected.
4.4.2.5 Type VII, swivels.
4.4.2.5.1 Proof load and breaking load test. Samples shall be subjected to the proof loads and breaking loads shown in tables XIX, XX, and XXI, either singly or in series. The swivels shall withstand the proof loads without developing surface rupture or defects that would interfere with serviceability.
4.4.2.5.2 Rejections. If any swivel fails to pass the proof or breaking load tests, all swivels in the lot shall be rejected.
4.4.2.6 Type XI, bead-chain insulating coupling dielectric strength test. Samples selected in accordance with table XXIX shall be tested for dielectric strength. One half of the samples shall be dried in a desiccator for 24 hours, removed, and immediately subjected to 10,000 volts. The remaining couplings shall be stored for 48 hours in an atmosphere of 35 °C (95 °F), 90 percent relative humidity, and immediately subjected to 4,000 volts. A tolerance of plus 1 hour and plus or minus 2 percent relative humidity will be permitted. The difference in potential for both samples shall be maintained for 1 minute.
4.4.2.7 Type XIII, pear-shaped links.
4.4.2.7.1 Proof test. Samples selected as specified in 4.2.2.2.1 shall be subjected to the proof loads as shown in table XXV. Before testing, the inside widths of the pear-shaped link shall be measured. After applying the proof load, the inside widths shall be re-measured and the sample shall be considered satisfactory if there is no measurable reduction in the inside widths.
4.4.2.7.2 Breaking load test. After proof testing, samples selected as specified in 4.2.2.2.1 shall be subjected to the breaking loads as shown in table XXV.
4.4.2.7.3 Rejections. If any link fails to pass the proof load or breaking load tests, the lot shall be rejected.
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