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ISO 2320-2015 pdf free download
ISO 2320-2015 pdf free download.Fasteners — Prevailing torque steel nuts — Functional properties
Fixations — Ecrous autofreinés en acier — Caractéristiques fonctionnelles.
9 Test method
The nuts shall be tested as received.
9.2 Proof load test
The proof load test shall be carried out in accordance with ISO 898-2. Additionally, the following applies.
The nut to be tested shall be assembled on a test bolt (see 93) or on a hardened steel mandrel. The maximum prevailing torque to assemble the nut through 3600 rotation shall be recorded after the first full thread has passed through the prevailing torque feature and assembly continues until three full threads protrude through the nut. For referee test purposes, a hardened steel mandrel shall be used for prevailing torque non-metallic Insert type nuts and a test bolt shall be used for prevailing torque all metal type nuts. The maximum prevailing torque occurring during the assembly of the nut on the test bolt or mandrel shall be recorded after the first full form thread has passed through the prevailing torque feature.
A load equal to the specified proof load for the nut, as specified in ISO 898-2, shall be applied through the test bolt or mandrel against the nut-hearing surface in an axial direction and shall be held for 15 s. The nut shall resist this load without thread stripping or rupture. The proof load test is decisive for acceptance.
The maximum prevailing torque occurring during disassembly of the nut after a half-turn to full disengagement measured with the nut in motion shall not exceed the recorded maximum prevailing torque during assembly.
NOTE Any nut used in the prevailing torque test (see 9.) may be used br the proof load test, as long as the nut threads are not damaged.
9.3 Prevailing torque test
The purpose of this test method is to obtain simultaneously on the prevailing torque nuts:
a) the functional properties (prevailing torques developed by the nut);ISO 2320-2015 pdf free download.
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