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Supplementary requirement S4 and S2 for SA194 GR.4 and SA320 GR.L7

Supplementary requirement S4 and S2 for SA194 GR.4 and SA320 GR.L7

Supplementary requirement S4 and S2 for SA194 GR.4 and SA320 GR.L7

Hi, I have a question regarding supplementary test S4 ( Proof load tests of large nuts)for SA 194 GR.4 Nuts and S2( lateral expansion test) for SA 320 Gr. L7 bolt.
I come across some documents in which only SA320 GR.L7 and SA194 GR.4 bolt and nuts are required to have supplementary tests S2 and S4 while other materials don't have such a requirement. My question is when we should require such tests? Is it related to MDMT ( for example for MDMT -95 C) ? or other parameters? Also, I don't understand the difference between impact test and lateral expansion impact test. When should we use lateral expansion test instead of impact test ?
I would appreciate it if you help me.

RE: Supplementary requirement S4 and S2 for SA194 GR.4 and SA320 GR.L7

Supplementary tests are not ASTM/ASME required tests. They are standardized descriptions of optional tests the purchasor may wish to invoke in an order, hence 'supplementary'.

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

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