Used on automated surface observing system s100 (asos). nut item is an M8 hex, stainless steel, used on all weather precipitation accumulation guages (awpag) alter windscreen
Used on 3040-01-555-6701. 2b thread class right-hand 14 thread quantity per inch nut - special medium carbon steel, grade b, min temsile strenght at 55 kpi zinc surface treated